Found 111 results
Author Title Type [ Year(Asc)]
2016
Authors: Clemens Adam, and Burgess David
Title: Pickup ion processes associated with spacecraft thrusters: Implications for solar probe plus
Abstract:

Chemical thrusters are widely used in spacecraft for attitude control and orbital manoeuvres. They create an exhaust plume of neutral gas which produces ions via photoionization and charge exchange. Measurements of local plasma properties will be affected by perturbations caused by the coupling between the newborn ions and the plasma. A model of neutral expansion has been used in conjunction with a fully three-dimensional hybrid code to study the evolution and ionization over time of the neutral cloud produced by the firing of a mono-propellant hydrazine thruster as well as the interactions of the resulting ion cloud with the ambient solar wind. Results are presented which show that the plasma in the region near to the spacecraft will be perturbed for an extended period of time with the. . .
Date: 03/2016 Publisher: Physics of Plasmas Pages: 032901 DOI: 10.1063/1.4942938 Available at: http://aip.scitation.org/doi/10.1063/1.4942938http://aip.scitation.org/doi/pdf/10.1063/1.4942938
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Authors: Cranmer Steven R.
Title: Predictions for Dusty Mass Loss from Asteroids During Close Encounters with Solar Probe Plus
Abstract:

The Solar Probe Plus ( SPP) mission will explore the Sun's corona and innermost solar wind starting in 2018. The spacecraft will also come close to a number of Mercury-crossing asteroids with perihelia less than 0.3 AU. At small heliocentric distances, these objects may begin to lose mass, thus becoming "active asteroids" with comet-like comae or tails. This paper assembles a database of 97 known Mercury-crossing asteroids that may be encountered by SPP, and it presents estimates of their time-dependent visible-light fluxes and mass loss rates. Assuming a similar efficiency of sky background subtraction as was achieved by STEREO , we find that approximately 80 % of these asteroids are bright enough to be observed by the Wide-field Imager for SPP (WISPR). A model of gas/dust mass loss fr. . .
Date: 11/2016 Publisher: Earth, Moon, and Planets Pages: 51 - 79 DOI: 10.1007/s11038-016-9490-5 Available at: http://link.springer.com/10.1007/s11038-016-9490-5http://link.springer.com/content/pdf/10.1007/s11038-016-9490-5.pdfhttp://link.springer.com/content/pdf/10.1007/s11038-016-9490-5.pdfhttp://link.springer.com/article/10.1007/s11038-016-9490-5/fulltext.html
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Authors: Abbo L., Ofman L., Antiochos S. K., Hansteen V. H., Harra L., et al.
Title: Slow Solar Wind: Observations and Modeling
Abstract:

While it is certain that the fast solar wind originates from coronal holes, where and how the slow solar wind (SSW) is formed remains an outstanding question in solar physics even in the post-SOHO era. The quest for the SSW origin forms a major objective for the planned future missions such as the Solar Orbiter and Solar Probe Plus. Nonetheless, results from spacecraft data, combined with theoretical modeling, have helped to investigate many aspects of the SSW. Fundamental physical properties of the coronal plasma have been derived from spectroscopic and imaging remote-sensing data and in situ data, and these results have provided crucial insights for a deeper understanding of the origin and acceleration of the SSW. Advanced models of the SSW in coronal streamers and other structures ha. . .
Date: 11/2016 Publisher: Space Science Reviews Pages: 55 - 108 DOI: 10.1007/s11214-016-0264-1 Available at: http://link.springer.com/10.1007/s11214-016-0264-1http://link.springer.com/content/pdf/10.1007/s11214-016-0264-1.pdfhttp://link.springer.com/content/pdf/10.1007/s11214-016-0264-1.pdfhttp://link.springer.com/article/10.1007/s11214-016-0264-1/fulltext.html
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Authors: Schwadron N. A., Bastian T., Leibacher J., Gary D., Pevtsov A., et al.
Title: The Solar Probe Plus Ground Based Network
Abstract:

Executive Summary. The role of the Solar Probe Plus (SPP) Ground-Based Network

(SPP-GBN) is to optimize and enhance the science return of the SPP mission by

providing unique data from the ground. The role of the GBN extends to planning and

coordination, supported by appropriate infrastructure, to ensure that the right kinds of

observations are acquired by the various facilities (see below), at the right times, and that

the data are readily accessible to the community for a variety of uses. The SPP-GBN

addresses science questions that will help interpreting SPP data, but also provide global

context and allow us to understand how SPP observations inform our understanding of

solar phenomena. Specifically, the S. . .
Date: DOI: N/A Available at: http://sppgway.jhuapl.edu/sites/default/files/Pubs/SPP-GBN-WhitePaper-v5.0.pdf
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Authors: Fox N. J., Velli M. C., Bale S. D., Decker R., Driesman A., et al.
Title: The Solar Probe Plus Mission: Humanity’s First Visit to Our Star
Abstract:

Solar Probe Plus (SPP) will be the first spacecraft to fly into the low solar corona. SPP's main science goal is to determine the structure and dynamics of the Sun's coronal magnetic field, understand how the solar corona and wind are heated and accelerated, and determine what processes accelerate energetic particles. Understanding these fundamental phenomena has been a top-priority science goal for over five decades, dating back to the 1958 Simpson Committee Report. The scale and concept of such a mission has been revised at intervals since that time, yet the core has always been a close encounter with the Sun. The mission design and the technology and engineering developments enable SPP to meet its science objectives to: (1) Trace the flow of energy that heats and accelerates the sola. . .
Date: 12/2016 Publisher: Space Science Reviews Pages: 7 - 48 DOI: 10.1007/s11214-015-0211-6 Available at: http://link.springer.com/10.1007/s11214-015-0211-6http://link.springer.com/content/pdf/10.1007/s11214-015-0211-6.pdf
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Authors: Chhiber R, Usmanov AV, Matthaeus WH, and Goldstein ML
Title: SOLAR WIND COLLISIONAL AGE FROM A GLOBAL MAGNETOHYDRODYNAMICS SIMULATION
Abstract:

Simple estimates of the number of Coulomb collisions experienced by the interplanetary plasma to the point of observation, I.e., the “collisional age”, can be usefully employed in the study of non-thermal features of the solar wind. Usually these estimates are based on local plasma properties at the point of observation. Here we improve the method of estimation of the collisional age by employing solutions obtained from global three-dimensional magnetohydrodynamics simulations. This enables evaluation of the complete analytical expression for the collisional age without using approximations. The improved estimation of the collisional timescale is compared with turbulence and expansion timescales to assess the relative importance of collisions. The collisional age computed using the . . .
Date: 04/2016 Publisher: The Astrophysical Journal Pages: 34 DOI: 10.3847/0004-637X/821/1/34 Available at: http://stacks.iop.org/0004-637X/821/i=1/a=34?key=crossref.788f196bae255efe123dabca17bb586dhttp://stacks.iop.org/0004-637X/821/i=1/a=34/pdfhttp://stacks.iop.org/0004-637X/821/i=1/a=34?key=crossref.788f196bae255efe123dabca17bb586d
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Authors: Vourlidas Angelos, Howard Russell A., Plunkett Simon P., Korendyke Clarence M., Thernisien Arnaud F. R., et al.
Title: The Wide-Field Imager for Solar Probe Plus (WISPR)
Abstract: N/A
Date: 02/2015 Publisher: Space Science Reviews Pages: 83 - 130 DOI: 10.1007/s11214-014-0114-y Available at: http://link.springer.com/content/pdf/10.1007/s11214-014-0114-y.pdf
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2015
Authors: de Patoul Judith, Foullon Claire, and Riley Pete
Title: 3D ELECTRON DENSITY DISTRIBUTIONS IN THE SOLAR CORONA DURING SOLAR MINIMA: ASSESSMENT FOR MORE REALISTIC SOLAR WIND MODELING
Abstract:

Knowledge of the electron density distribution in the solar corona put constraints on the magnetic field configurations for coronal modeling and on initial conditions for solar wind modeling. We work with polarized SOHO/LASCO-C2 images from the last two recent minima of solar activity (1996-1997 and 2008-2010), devoid of coronal mass ejections. The goals are to derive the 4D electron density distributions in the corona by applying a newly developed time-dependent tomographic reconstruction method and to compare the results between the two solar minima and with two magnetohydrodynamic models. First, we confirm that the values of the density distribution in thermodynamic models are more realistic than in polytropic ones. The tomography provides more accurate distributions in the polar reg. . .
Date: 11/2015 Publisher: The Astrophysical Journal Pages: 68 DOI: 10.1088/0004-637X/814/1/68 Available at: http://stacks.iop.org/0004-637X/814/i=1/a=68?key=crossref.845557cfda4b2a3786588c8b62dbb093
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Authors: Daloz Anne S., Camargo S. J., Kossin J. P., Emanuel K., Horn M., et al.
Title: Cluster Analysis of Downscaled and Explicitly Simulated North Atlantic Tropical Cyclone Tracks
Abstract:

A realistic representation of the North Atlantic tropical cyclone tracks is crucial as it allows, for example, explaining potential changes in U.S. landfalling systems. Here, the authors present a tentative study that examines the ability of recent climate models to represent North Atlantic tropical cyclone tracks. Tracks from two types of climate models are evaluated: explicit tracks are obtained from tropical cyclones simulated in regional or global climate models with moderate to high horizontal resolution (1°–0.25°), and downscaled tracks are obtained using a downscaling technique with large-scale environmental fields from a subset of these models. For both configurations, tracks are objectively separated into four groups using a cluster technique, leading to a zonal and a merid. . .
Date: 02/2015 Publisher: Journal of Climate Pages: 1333 - 1361 DOI: 10.1175/JCLI-D-13-00646.1 Available at: http://journals.ametsoc.org/doi/10.1175/JCLI-D-13-00646.1
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Authors: el H. ̧, Motschmann U., üchner J., Narita Y., and Nariyuki Y.
Title: ION-SCALE TURBULENCE IN THE INNER HELIOSPHERE: RADIAL DEPENDENCE
Abstract:

The evolution of the ion-scale plasma turbulence in the inner heliosphere is studied by associating the plasma parameters for hybrid-code turbulence simulations to the radial distance from the Sun via a Solar wind model based mapping procedure. Using a mapping based on a one-dimensional solar wind expansion model, the resulting ion-kinetic scale turbulence is related to the solar wind distance from the Sun. For this purpose the mapping is carried out for various values of ion beta that correspond to the heliocentric distance. It is shown that the relevant normal modes such as ion cyclotron and ion Bernstein modes will occur first at radial distances of about 0.2-0.3 AU, i.e., near the Mercury orbit. This finding can be used as a reference, a prediction to guide the in situ measurements . . .
Date: 10/2015 Publisher: The Astrophysical Journal Pages: 175 DOI: 10.1088/0004-637X/812/2/175 Available at: http://stacks.iop.org/0004-637X/812/i=2/a=175?key=crossref.a9d511ae127248e735f11254de6e3bb9
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Authors: Isenberg Philip A., and Vasquez Bernard J.
Title: KINETIC EVOLUTION OF CORONAL HOLE PROTONS BY IMBALANCED ION-CYCLOTRON WAVES: IMPLICATIONS FOR MEASUREMENTS BY SOLAR PROBE PLUS
Abstract:

We extend the kinetic guiding-center model of collisionless coronal hole protons presented in Isenberg & Vasquez to consider driving by imbalanced spectra of obliquely propagating ion-cyclotron waves. These waves are assumed to be a small by-product of the imbalanced turbulent cascade to high perpendicular wavenumber, and their total intensity is taken to be 1% of the total fluctuation energy. We also extend the kinetic solutions for the proton distribution function in the resulting fast solar wind to heliocentric distances of 20 solar radii, which will be attainable by the Solar Probe Plus spacecraft. We consider three ratios of outward-propagating to inward-propagating resonant intensities: 1, 4, and 9. The self-consistent bulk flow speed reaches fast solar wind values in all case. . .
Date: 08/2015 Publisher: The Astrophysical Journal Pages: 119 DOI: 10.1088/0004-637X/808/2/119 Available at: http://stacks.iop.org/0004-637X/808/i=2/a=119?key=crossref.961efccaa84816c8b4c9e041f523e07f
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Authors: Klein Kristopher G., Perez Jean C., Verscharen Daniel, Mallet Alfred, and Chandran Benjamin D. G.
Title: A MODIFIED VERSION OF TAYLOR’S HYPOTHESIS FOR SOLAR PROBE PLUS OBSERVATIONS
Abstract:

The Solar Probe Plus (SPP) spacecraft will explore the near-Sun environment, reaching heliocentric distances less than 10 {{R}}. Near Earth, spacecraft measurements of fluctuating velocities and magnetic fields taken in the time domain are translated into information about the spatial structure of the solar wind via Taylor’s “frozen turbulence” hypothesis. Near the perihelion of SPP, however, the solar-wind speed is comparable to the Alfvén speed, and Taylor’s hypothesis in its usual form does not apply. In this paper, we show that under certain assumptions, a modified version of Taylor’s hypothesis can be recovered in the near-Sun region. We consider only the transverse, non-compressive component of the fluctuations at length scales exceeding the proton gyrora. . .
Date: 03/2015 Publisher: The Astrophysical Journal Pages: L18 DOI: 10.1088/2041-8205/801/1/L18 Available at: http://stacks.iop.org/2041-8205/801/i=1/a=L18?key=crossref.c92a2bde23ce9cdd58185dec581d5a09
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Authors: Plus M., Auby I., Maurer D., Trut G., Del Amo Y., et al.
Title: Phytoplankton versus macrophyte contribution to primary production and biogeochemical cycles of a coastal mesotidal system. A modelling approach
Abstract:

This study presents an assessment of the contributions of various primary producers to the global annual production and N/P cycles of a coastal system, namely the Arcachon Bay, by means of a numerical model. This 3D model fully couples hydrodynamic with ecological processes and simulates nitrogen, silicon and phosphorus cycles as well as phytoplankton, macroalgae and seagrasses. Total annual production rates for the different components were calculated for different years (2005, 2007 and 2009) during a time period of drastic reduction in seagrass beds since 2005. The total demand of nitrogen and phosphorus was also calculated and discussed with regards to the riverine inputs. Moreover, this study presents the first estimation of particulate organic carbon export to the adjacent open oce. . .
Date: 11/2015 Publisher: Estuarine, Coastal and Shelf Science Pages: 52 - 60 DOI: 10.1016/j.ecss.2015.09.003 Available at: https://linkinghub.elsevier.com/retrieve/pii/S0272771415300810https://api.elsevier.com/content/article/PII:S0272771415300810?httpAccept=text/xmlhttps://api.elsevier.com/content/article/PII:S0272771415300810?httpAccept=text/plain
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Authors: Good S. W., Forsyth R. J., Raines J. M., Gershman D. J., Slavin J. A., et al.
Title: RADIAL EVOLUTION OF A MAGNETIC CLOUD: MESSENGER , STEREO , AND VENUS EXPRESS OBSERVATIONS
Abstract:

The Solar Orbiter and Solar Probe Plus missions will provide observations of magnetic clouds closer to the Sun than ever before, and it will be good preparation for these missions to make full use of the most recent in situ data sets from the inner heliosphere—namely, those provided by MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) and Venus Express—for magnetic cloud studies. We present observations of the same magnetic cloud made by MESSENGER at Mercury and later by Solar TErrestrial RElations Observatory-B (STEREO-B), while the spacecraft were radially aligned in 2011 November. Few such radial observations of magnetic clouds have been previously reported. Estimates of the solar wind speed at MESSENGER are also presented, calculated through the applicati. . .
Date: 07/2015 Publisher: The Astrophysical Journal Pages: 177 DOI: 10.1088/0004-637X/807/2/177 Available at: http://stacks.iop.org/0004-637X/807/i=2/a=177?key=crossref.a1b49ae2196cca72b5d1ec280eba0793
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Authors: Kuznetsov V.D.
Title: Solar and heliospheric space missions
Abstract:

The paper provides a review of the state of the art and prospects of space research in heliophysics, in which a pivotal role belongs to magnetic measurements in the Sun and heliosphere. New space missions, such as the Interhelioprobe, Solar Orbiter, Solar Probe Plus, etc., will follow the currently operating ones (Hinode, SDO, STEREO, etc.) to observe the Sun from short distances and from out-of-ecliptic positions, as well as to conduct in situ measurements in the vicinity of the Sun and outside the ecliptic. The planned coordinated observations within the framework of these missions will allow us to explore the structure and dynamics of magnetic fields in the polar regions of the Sun, to study the mechanisms of the solar dynamo and solar cycle, to gain a deeper insight into the process. . .
Date: 02/2015 Publisher: Advances in Space Research Pages: 879 - 885 DOI: 10.1016/j.asr.2014.07.034 Available at: https://linkinghub.elsevier.com/retrieve/pii/S0273117714004906https://api.elsevier.com/content/article/PII:S0273117714004906?httpAccept=text/xmlhttps://api.elsevier.com/content/article/PII:S0273117714004906?httpAccept=text/plain
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Authors: Kasper Justin C., Abiad Robert, Austin Gerry, Balat-Pichelin Marianne, Bale Stuart D., et al.
Title: Solar Wind Electrons Alphas and Protons (SWEAP) Investigation: Design of the Solar Wind and Coronal Plasma Instrument Suite for Solar Probe Plus
Abstract:

The Solar Wind Electrons Alphas and Protons (SWEAP) Investigation on Solar Probe Plus is a four sensor instrument suite that provides complete measurements of the electrons and ionized helium and hydrogen that constitute the bulk of solar wind and coronal plasma. SWEAP consists of the Solar Probe Cup (SPC) and the Solar Probe Analyzers (SPAN). SPC is a Faraday Cup that looks directly at the Sun and measures ion and electron fluxes and flow angles as a function of energy. SPAN consists of an ion and electron electrostatic analyzer (ESA) on the ram side of SPP (SPAN-A) and an electron ESA on the anti-ram side (SPAN-B). The SPAN-A ion ESA has a time of flight section that enables it to sort particles by their mass/charge ratio, permitting differentiation of ion species. SPAN-A and -B are r. . .
Date: 10/2015 Publisher: Space Science Reviews DOI: 10.1007/s11214-015-0206-3 Available at: http://link.springer.com/10.1007/s11214-015-0206-3http://link.springer.com/content/pdf/10.1007/s11214-015-0206-3
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Authors: Ruffenach A., Lavraud B., Farrugia C. J., émoulin P., Dasso S., et al.
Title: Statistical study of magnetic cloud erosion by magnetic reconnection
Abstract:

recent studies suggest that magnetic reconnection is able to erode substantial amounts of the outer magnetic flux of interplanetary magnetic clouds (MCs) as they propagate in the heliosphere. We quantify and provide a broader context to this process, starting from 263 tabulated interplanetary coronal mass ejections, including MCs, observed over a time period covering 17 years and at a distance of 1 AU from the Sun with Wind (1995-2008) and the two STEREO (2009-2012) spacecraft. Based on several quality factors, including careful determination of the MC boundaries and main magnetic flux rope axes, an analysis of the azimuthal flux imbalance expected from erosion by magnetic reconnection was performed on a subset of 50 MCs. The results suggest that MCs may be eroded at the front or at rea. . .
Date: 01/2015 Publisher: Journal of Geophysical Research: Space Physics Pages: 43 - 60 DOI: 10.1002/2014JA020628 Available at: http://doi.wiley.com/10.1002/2014JA020628http://onlinelibrary.wiley.com/wol1/doi/10.1002/2014JA020628/fullpdf
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2014
Authors: Goelzer Molly L., Schwadron Nathan A., and Smith Charles W.
Title: An analysis of Alfvén radius based on sunspot number from 1749 to today
Abstract:

The Solar Probe Plus mission now under construction will provide the first in situ measurements from inside the orbit of Mercury. The most critical part of that mission will be measurements from inside the Alfvén radius where the Alfvén speed exceeds the wind speed and the physics of the solar wind changes fundamentally due, in part, to the multidirectionality of wave propagation. In this region waves from both sunward and antisunward of the observation point can effect the local dynamics including the turbulent evolution, heating, and acceleration of the plasma. While the location of this point can change with solar wind conditions, we ask the question of whether there is a systematic dependence on the solar cycle that moves the average Alfvén radius to different locations depending. . .
Date: 01/2014 Publisher: Journal of Geophysical Research: Space Physics Pages: 115 - 120 DOI: 10.1002/2013JA019420 Available at: http://doi.wiley.com/10.1002/2013JA019420http://onlinelibrary.wiley.com/wol1/doi/10.1002/2013JA019420/fullpdf
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Authors: Marchand R., Miyake Y., Usui H., Deca J., Lapenta G., et al.
Title: Cross-comparison of spacecraft-environment interaction model predictions applied to Solar Probe Plus near perihelion
Abstract:

Five spacecraft-plasma models are used to simulate the interaction of a simplified geometry Solar Probe Plus (SPP) satellite with the space environment under representative solar wind conditions near perihelion. By considering similarities and differences between results obtained with different numerical approaches under well defined conditions, the consistency and validity of our models can be assessed. The impact on model predictions of physical effects of importance in the SPP mission is also considered by comparing results obtained with and without these effects. Simulation results are presented and compared with increasing levels of complexity in the physics of interaction between solar environment and the SPP spacecraft. The comparisons focus particularly on spacecraft floating po. . .
Date: 06/2014 Publisher: Physics of Plasmas Pages: 062901 DOI: 10.1063/1.4882439 Available at: http://aip.scitation.org/doi/10.1063/1.4882439http://aip.scitation.org/doi/pdf/10.1063/1.4882439
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Authors: Li T. C., Drake J. F., and Swisdak M.
Title: DYNAMICS OF DOUBLE LAYERS, ION ACCELERATION, AND HEAT FLUX SUPPRESSION DURING SOLAR FLARES
Abstract:

Observations of flare-heated electrons in the corona typically suggest confinement of electrons. The confinement mechanism, however, remains unclear. The transport of coronal hot electrons into ambient plasma was recently investigated by particle-in-cell (PIC) simulations. Electron transport was significantly suppressed by the formation of a highly localized, nonlinear electrostatic potential in the form of a double layer (DL). In this work large-scale PIC simulations are performed to explore the dynamics of DLs in larger systems where, instead of a single DL, multiple DLs are generated. The primary DL accelerates return current electrons, resulting in high velocity electron beams that interact with ambient ions. This forms a Buneman unstable system that spawns more DLs. Trapping of hea. . .
Date: 09/2014 Publisher: The Astrophysical Journal Pages: 7 DOI: 10.1088/0004-637X/793/1/7 Available at: http://stacks.iop.org/0004-637X/793/i=1/a=7?key=crossref.1ff276d1b5e9632b2d52ebb5720bc5e6
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Authors: Binias Cindy, Do Van Tu, Jude-Lemeilleur Florence, Plus Martin, Froidefond Jean-Marie, et al.
Title: Environmental factors contributing to the development of brown muscle disease and perkinsosis in Manila clams ( Ruditapes philippinarum ) and trematodiasis in cockles ( Cerastoderma edule ) of Arcachon Bay
Abstract: N/A
Date: 06/2014 Publisher: Marine Ecology Pages: 67 - 77 DOI: 10.1111/maec.2014.35.issue-s110.1111/maec.12087 Available at: http://doi.wiley.com/10.1111/maec.2014.35.issue-s1http://doi.wiley.com/10.1111/maec.12087https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaec.12087
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Authors: Balat-Pichelin M., Eck J., Heurtault S., and énat H.
Title: Experimental study of pyrolytic boron nitride at high temperature with and without proton and VUV irradiations
Abstract:

In the frame of future exploration missions such as Solar Probe Plus (NASA) and PHOIBOS (ESA), research was carried out to study pyrolytic BN material envisaged as coating for their heat shields. The physico-chemical behavior of CVD pBN at very high temperature with or without hydrogen ions and VUV (Vacuum Ultra-Violet) irradiations was studied in high vacuum together with the in situ measurement of the thermal radiative properties conditioning the thermal equilibrium of the heat shield. Experimental results obtained on massive pBN samples are presented through in situ mass spectrometry and mass loss rate, and post-test microstructural characterization by XRD, SEM, AFM and nano-indentation techniques, some of them leading to mechanical properties. It could be concluded that synergistic . . .
Date: 09/2014 Publisher: Applied Surface Science Pages: 415 - 425 DOI: 10.1016/j.apsusc.2014.07.007 Available at: https://linkinghub.elsevier.com/retrieve/pii/S0169433214015219https://api.elsevier.com/content/article/PII:S0169433214015219?httpAccept=text/xmlhttps://api.elsevier.com/content/article/PII:S0169433214015219?httpAccept=text/plain
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Authors: DeForest C. E., Howard T. A., and McComas D. J.
Title: INBOUND WAVES IN THE SOLAR CORONA: A DIRECT INDICATOR OF ALFVÉN SURFACE LOCATION
Abstract:

The tenuous supersonic solar wind that streams from the top of the corona passes through a natural boundary—the Alfvén surface—that marks the causal disconnection of individual packets of plasma and magnetic flux from the Sun itself. The Alfvén surface is the locus where the radial motion of the accelerating solar wind passes the radial Alfvén speed, and therefore any displacement of material cannot carry information back down into the corona. It is thus the natural outer boundary of the solar corona and the inner boundary of interplanetary space. Using a new and unique motion analysis to separate inbound and outbound motions in synoptic visible-light image sequences from the COR2 coronagraph on board the STEREO-A spacecraft, we have identified inbound wave motion in the outer co. . .
Date: 06/2014 Publisher: The Astrophysical Journal Pages: 124 DOI: 10.1088/0004-637X/787/2/124 Available at: http://stacks.iop.org/0004-637X/787/i=2/a=124?key=crossref.8ca79a982204ddd2b4922cc108364616
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Authors: McComas D. J., Alexander N., Angold N., Bale S., Beebe C., et al.
Title: Integrated Science Investigation of the Sun (ISIS): Design of the Energetic Particle Investigation
Abstract:

The Integrated Science Investigation of the Sun (ISIS) is a complete science investigation on the Solar Probe Plus (SPP) mission, which flies to within nine solar radii of the Sun’s surface. ISIS comprises a two-instrument suite to measure energetic particles over a very broad energy range, as well as coordinated management, science operations, data processing, and scientific analysis. Together, ISIS observations allow us to explore the mechanisms of energetic particles dynamics, including their: (1) Origins—defining the seed populations and physical conditions necessary for energetic particle acceleration; (2) Acceleration—determining the roles of shocks, reconnection, waves, and turbulence in accelerating energetic particles; and (3) Transport—revealing how ener. . .
Date: 07/2014 Publisher: Space Science Reviews DOI: 10.1007/s11214-014-0059-1 Available at: http://link.springer.com/content/pdf/10.1007/s11214-014-0059-1
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Authors: Rasca A. P., Oran R., and ányi M.
Title: Mass loading of the solar wind by a sungrazing comet
Abstract:

Collisionless mass loading was suggested by Biermann et al. (1967) for describing interactions between the solar wind and cometary atmospheres. Recent observations have led to an increased interest in coronal mass loading due to sungrazing comets and collisional debris of sunward migrating interplanetary dust particles. In a previous paper, we presented a 3-D MHD model of the solar corona based on the Block-Adaptive-Tree-Solarwind-Roe-Upwind-Scheme code which includes the interaction of dust with the solar wind. We have shown the impact on the solar wind from abrupt mass loading in the coronal region. We apply the model to a sungrazing cometary source, using ejected dust dynamics to generate tail-shaped mass-loading regions. Results help predict the effects on the solar wind acceleratio. . .
Date: 08/2014 Publisher: Geophysical Research Letters Pages: 5376 - 5381 DOI: 10.1002/2014GL060990 Available at: http://doi.wiley.com/10.1002/2014GL060990http://onlinelibrary.wiley.com/wol1/doi/10.1002/2014GL060990/fullpdfhttps
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