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Found 26 entries in the Bibliography.
Showing entries from 1 through 26
2022 |
The transport of energetic charged particles (e.g., cosmic rays) in turbulent magnetic fields is usually characterized in terms of the diffusion parallel and perpendicular to a large-scale (or mean) magnetic field. The nonlinear guiding center theory has been a prominent perpendicular diffusion theory. A recent version of this theory, based on the random ballistic spreading of magnetic field lines and a backtracking correction (RBD/BC), has shown good agreement with test particle simulations for a two-component magnetic turb ... Snodin, A.~P.; Jitsuk, T.; Ruffolo, D.; Matthaeus, W.~H.; Published by: \apj Published on: jun YEAR: 2022   DOI: 10.3847/1538-4357/ac6e6d Parker Data Used; cosmic rays; magnetic fields; Particle astrophysics; 329; 994; 96; Physics - Plasma Physics; Astrophysics - High Energy Astrophysical Phenomena; Physics - Space Physics |
2021 |
Domains of Magnetic Pressure Balance in Parker Solar Probe Observations of the Solar Wind The Parker Solar Probe (PSP) spacecraft is performing the first in situ exploration of the solar wind within 0.2 au of the Sun. Initial observations confirmed the Alfv\ enic nature of aligned fluctuations of the magnetic field B and velocity V in solar wind plasma close to the Sun, in domains of nearly constant magnetic field magnitude \ensuremath\mid B \ensuremath\mid, i.e., approximate magnetic pressure balance. Such domains are interrupted by particularly strong fluctuations, including but not limited to radial field (pol ... Ruffolo, David; Ngampoopun, Nawin; Bhora, Yash; Thepthong, Panisara; Pongkitiwanichakul, Peera; Matthaeus, William; Chhiber, Rohit; Published by: \apj Published on: dec YEAR: 2021   DOI: 10.3847/1538-4357/ac2ee3 Parker Data Used; 1534; 830; 1544; 824; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics |
Context. In 2020 May-June, six solar energetic ion events were observed by the Parker Solar Probe/IS⊙IS instrument suite at ≈0.35 AU from the Sun. From standard velocity-dispersion analysis, the apparent ion path length is ≈0.625 AU at the onset of each event. Chhiber, R.; Matthaeus, W.; Cohen, C.; Ruffolo, D.; Sonsrettee, W.; Tooprakai, P.; Seripienlert, A.; Chuychai, P.; Usmanov, A.; Goldstein, M.; McComas, D.; Leske, R.; Christian, E.; Mewaldt, R.; Labrador, A.; al., et; Published by: Astronomy and Astrophysics Published on: 06/2021 YEAR: 2021   DOI: "10.1051/0004-6361/202039816" |
The random walk of magnetic field lines is an important ingredient in understanding how the connectivity of the magnetic field affects the spatial transport and diffusion of charged particles. As solar energetic particles propagate away from near-solar sources, they interact with the fluctuating magnetic field, which modifies their distributions. We develop a formalism in which the differential equation describing the field line random walk contains both effects due to localized magnetic displacements and a non-stochastic co ... Chhiber, Rohit; Ruffolo, David; Matthaeus, William; Usmanov, Arcadi; Tooprakai, Paisan; Chuychai, Piyanate; Goldstein, Melvyn; Published by: The Astrophysical Journal Published on: 02/2021 YEAR: 2021   DOI: 10.3847/1538-4357/abd7f0 Parker Data Used; Solar energetic particles; interplanetary turbulence; interplanetary magnetic fields; Solar wind; 1491; 830; 824; 1534; Physics - Space Physics; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics |
2020 |
The Parker Solar Probe (PSP) mission has been studied since 1958. After many iterations and changes in design, the mission was launched on August 12, 2018 (see, https://www.nasa.gov/content/goddard/parker-solar-probe). PSP has completed its 3rd rendezvous with Venus and 6th perihelion passage. Each flyby brings PSP closer to the Sun (eventually to 9.7 solar radii). In October 2020 it flew within 20 solar radii of the solar surface. A goal of the mission is to determine how the solar corona is heated to ∼ a million degrees. ... Goldstein, Melvyn; Ruffolo, D.; Matthaeus, W.~H.; Chhiber, R.; Usmanov, A.~V.; Yang, Y.; Bandyopadhyay, R.; Parashar, T.~N.; DeForest, E.; Wan, M.; Chasapis, A.; Maruca, B.~A.; Velli, M.; Kasper, J.~C.; Published by: Radiation Effects and Defects in Solids Published on: 11/2020 YEAR: 2020   DOI: 10.1080/10420150.2020.1845690 |
Shear-driven Transition to Isotropically Turbulent Solar Wind Outside the Alfv\ en Critical Zone Motivated by prior remote observations of a transition from striated\ solar\ coronal structures to more isotropic "flocculated" fluctuations, we propose that the dynamics of the inner\ solar\ wind just outside the Alfven critical zone, and in the vicinity of the first beta = 1 surface, is powered by the relative velocities of adjacent coronal magnetic flux tubes. We suggest that large-amplitude flow contrasts are magnetically constrained at lower altitude but shear-driven dynamics are triggered as such ... Ruffolo, D.; Matthaeus, W.; Chhiber, R.; Usmanov, A.; Yang, Y.; Bandyopadhyay, R.; Parashar, T.; Goldstein, M.; Deforest, C.; Wan, M.; Chasapis, A.; Maruca, B.; Velli, M.; Kasper, J.; Published by: The Astrophysical Journal Published on: 10/2020 YEAR: 2020   DOI: 10.3847/1538-4357/abb594 |
During the Parker Solar Probe\textquoterights (PSP) first perihelion pass, the spacecraft reached within a heliocentric distance of ̃37 R☉ and observed numerous magnetic and flow structures characterized by sharp gradients. To better understand these intermittent structures in the young solar wind, an important property to examine is their degree of correlation in time and space. To this end, we use the well-tested partial variance of increments (PVI) technique to identify intermittent events in FIELDS and S ... Chhiber, Rohit; Goldstein, M; Maruca, B.; Chasapis, A.; Matthaeus, W.; Ruffolo, D.; Bandyopadhyay, R.; Parashar, T.; Qudsi, R.; de Wit, Dudok; Bale, S.; Bonnell, J.; Goetz, K.; Harvey, P.; MacDowall, R.; Malaspina, D.; Pulupa, M.; Kasper, J.; Korreck, K.; Case, A.; Stevens, M.; Whittlesey, P.; Larson, D.; Livi, R.; Velli, M.; Raouafi, N.; Published by: The Astrophysical Journal Supplement Series Published on: 02/2020 YEAR: 2020   DOI: 10.3847/1538-4365/ab53d2 Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Space Physics; Solar Probe Plus |
Enhanced Energy Transfer Rate in Solar Wind Turbulence Observed near the Sun from Parker Solar Probe Direct evidence of an inertial-range turbulent energy cascade has been provided by spacecraft observations in heliospheric plasmas. In the solar wind, the average value of the derived heating rate near 1 au is \~10\ 3\ Jkg\ -1\ s\ -1\ \ \~103Jkg-1s-1 , an amount sufficient to account for observed departures from adiabatic expansion. Parker Solar Probe, even during its first solar encounter, offers the first opportunity to compute, in a similar fashion, a fluid-scale energy decay rate, mu ... Bandyopadhyay, Riddhi; Goldstein, M.; Maruca, B.; Matthaeus, W.; Parashar, T.; Ruffolo, D.; Chhiber, R.; Usmanov, A.; Chasapis, A.; Qudsi, R.; Bale, Stuart; Bonnell, J.; de Wit, Thierry; Goetz, Keith; Harvey, Peter; MacDowall, Robert; Malaspina, David; Pulupa, Marc; Kasper, J.; Korreck, K.; Case, A.; Stevens, M.; Whittlesey, P.; Larson, D.; Livi, R.; Klein, K.; Velli, M.; Raouafi, N.; Published by: The Astrophysical Journal Supplement Series Published on: 02/2020 YEAR: 2020   DOI: 10.3847/1538-4365/ab5dae Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Plasma Physics; Physics - Space Physics; Solar Probe Plus |
Measures of Scale-dependent Alfv\ enicity in the First PSP Solar Encounter The solar wind shows periods of highly Alfv\ enic activity, where velocity fluctuations and magnetic fluctuations are aligned or antialigned with each other. It is generally agreed that solar wind plasma velocity and magnetic field fluctuations observed by the Parker Solar Probe (PSP) during the first encounter are mostly highly Alfv\ enic. However, quantitative measures of Alfv\ enicity are needed to understand how the characterization of these fluctuations compares with standard measures from prior missions in the inner ... Parashar, T.; Goldstein, M.; Maruca, B.; Matthaeus, W.; Ruffolo, D.; Bandyopadhyay, R.; Chhiber, R.; Chasapis, A.; Qudsi, R.; Vech, D.; Roberts, D.; Bale, S.; Bonnell, J.; de Wit, Dudok; Goetz, K.; Harvey, P.; MacDowall, R.; Malaspina, D.; Pulupa, M.; Kasper, J.; Korreck, K.; Case, A.; Stevens, M.; Whittlesey, P.; Larson, D.; Livi, R.; Velli, M.; Raouafi, N.; Published by: The Astrophysical Journal Supplement Series Published on: 02/2020 YEAR: 2020   DOI: 10.3847/1538-4365/ab64e6 |
Observations at 1 au have confirmed that enhancements in measured energetic-particle (EP) fluxes are statistically associated with "rough" magnetic fields, i.e., fields with atypically large spatial derivatives or increments, as measured by the Partial Variance of Increments (PVI) method. One way to interpret this observation is as an association of the EPs with trapping or channeling within magnetic flux tubes, possibly near their boundaries. However, it remains unclear whether this association is a transport or local ef ... Bandyopadhyay, Riddhi; Matthaeus, W.; Parashar, T.; Chhiber, R.; Ruffolo, D.; Goldstein, M.; Maruca, B.; Chasapis, A.; Qudsi, R.; McComas, D.; Christian, E.; Szalay, J.; Joyce, C.; Giacalone, J.; Schwadron, N.; Mitchell, D.; Hill, M.; Wiedenbeck, M.; McNutt, R.; Desai, M.; Bale, Stuart; Bonnell, J.; de Wit, Thierry; Goetz, Keith; Harvey, Peter; MacDowall, Robert; Malaspina, David; Pulupa, Marc; Velli, M.; Kasper, J.; Korreck, K.; Stevens, M.; Case, A.; Raouafi, N.; Published by: The Astrophysical Journal Supplement Series Published on: 02/2020 YEAR: 2020   DOI: 10.3847/1538-4365/ab6220 Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Plasma Physics; Physics - Space Physics; Solar Probe Plus |
2017 |
Coronal Heating Topology: The Interplay of Current Sheets and Magnetic Field Lines Rappazzo, A.~F.; Matthaeus, W.~H.; Ruffolo, D.; Velli, M.; Servidio, S.; Published by: \apj Published on: 07/2017 YEAR: 2017   DOI: 10.3847/1538-4357/aa79f2 Parker Data Used; magnetohydrodynamics: MHD; Solar wind; Sun: activity; Sun: corona; Sun: magnetic fields; turbulence; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics; Physics - Space Physics |
Chhiber, R.; Subedi, P.; Usmanov, A.~V.; Matthaeus, W.~H.; Ruffolo, D.; Goldstein, M.~L.; Parashar, T.~N.; Published by: \apjs Published on: 06/2017 YEAR: 2017   DOI: 10.3847/1538-4365/aa74d2 Parker Data Used; cosmic rays; diffusion; methods: numerical; Solar wind; turbulence; Physics - Space Physics |
Charged Particle Diffusion in Isotropic Random Magnetic Fields Subedi, P.; Sonsrettee, W.; Blasi, P.; Ruffolo, D.; Matthaeus, W.~H.; Montgomery, D.; Chuychai, P.; Dmitruk, P.; Wan, M.; Parashar, T.~N.; Chhiber, R.; Published by: \apj Published on: 03/2017 YEAR: 2017   DOI: 10.3847/1538-4357/aa603a Parker Data Used; astroparticle physics; cosmic rays; diffusion; magnetic fields; scattering; turbulence; Physics - Space Physics; Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Solar and Stellar Astrophysics |
2016 |
Tooprakai, P.; Seripienlert, A.; Ruffolo, D.; Chuychai, P.; Matthaeus, W.~H.; Published by: \apj Published on: 11/2016 YEAR: 2016   DOI: 10.3847/0004-637X/831/2/195 Parker Data Used; magnetic fields; Solar wind; Sun: particle emission; turbulence |
Magnetic Field Line Random Walk in Isotropic Turbulence with Varying Mean Field Sonsrettee, W.; Subedi, P.; Ruffolo, D.; Matthaeus, W.~H.; Snodin, A.~P.; Wongpan, P.; Chuychai, P.; Rowlands, G.; Vyas, S.; Published by: \apjs Published on: 08/2016 YEAR: 2016   DOI: 10.3847/0067-0049/225/2/20 |
Local modulation and trapping of energetic particles by coherent magnetic structures Tessein, Jeffrey; Ruffolo, David; Matthaeus, William; Wan, Minping; Published by: \grl Published on: 04/2016 YEAR: 2016   DOI: 10.1002/2016GL068045 Parker Data Used; Solar wind; turbulence; Energetic particles; intermittency; magnetic fields |
2015 |
Dynamical Field Line Connectivity in Magnetic Turbulence Ruffolo, D.; Matthaeus, W.~H.; Published by: \apj Published on: 06/2015 YEAR: 2015   DOI: 10.1088/0004-637X/806/2/233 |
Magnetic Field Line Random Walk in Isotropic Turbulence with Zero Mean Field Sonsrettee, W.; Subedi, P.; Ruffolo, D.; Matthaeus, W.~H.; Snodin, A.~P.; Wongpan, P.; Chuychai, P.; Published by: \apj Published on: 01/2015 YEAR: 2015   DOI: 10.1088/0004-637X/798/1/59 Parker Data Used; diffusion; ISM: magnetic fields; turbulence |
2014 |
Complexity and Diffusion of Magnetic Flux Surfaces in Anisotropic Turbulence Servidio, S.; Matthaeus, W.~H.; Wan, M.; Ruffolo, D.; Rappazzo, A.~F.; Oughton, S.; Published by: \apj Published on: 04/2014 YEAR: 2014   DOI: 10.1088/0004-637X/785/1/56 Parker Data Used; ISM: magnetic fields; magnetic fields; magnetic reconnection; magnetohydrodynamics: MHD; Solar wind; Sun: magnetic fields |
2013 |
Magnetic Field Line Random Walk in Models and Simulations of Reduced Magnetohydrodynamic Turbulence Snodin, A.~P.; Ruffolo, D.; Oughton, S.; Servidio, S.; Matthaeus, W.~H.; Published by: \apj Published on: 12/2013 YEAR: 2013   DOI: 10.1088/0004-637X/779/1/56 Parker Data Used; diffusion; magnetic fields; magnetohydrodynamics: MHD; turbulence |
Squeezing of Particle Distributions by Expanding Magnetic Turbulence and Space Weather Variability Ruffolo, D.; Seripienlert, A.; Tooprakai, P.; Chuychai, P.; Matthaeus, W.~H.; Published by: \apj Published on: 12/2013 YEAR: 2013   DOI: 10.1088/0004-637X/779/1/74 Parker Data Used; galaxies: jets; ISM: jets and outflows; magnetic fields; solar-terrestrial relations; Solar wind; turbulence |
Association of Suprathermal Particles with Coherent Structures and Shocks Tessein, J.~A.; Matthaeus, W.~H.; Wan, M.; Osman, K.~T.; Ruffolo, D.; Giacalone, J.; Published by: \apjl Published on: 10/2013 YEAR: 2013   DOI: 10.1088/2041-8205/776/1/L8 Parker Data Used; acceleration of particles; magnetohydrodynamics: MHD; plasmas; shock waves; Solar wind |
Snodin, A.~P.; Ruffolo, D.; Matthaeus, W.~H.; Published by: \apj Published on: 01/2013 YEAR: 2013   DOI: 10.1088/0004-637X/762/1/66 |
Theory of magnetic field line random walk in noisy reduced magnetohydrodynamic turbulence Ruffolo, D.; Matthaeus, W.~H.; Published by: Physics of Plasmas Published on: 01/2013 YEAR: 2013   DOI: 10.1063/1.4789606 Parker Data Used; plasma fluctuations; plasma magnetohydrodynamics; plasma simulation; plasma transport processes; plasma turbulence; random processes; Solar corona; stochastic processes; 52.25.Fi; 05.40.Fb; 52.30.Cv; 52.35.Ra; 52.65.Kj; 52.25.Gj; Transport properties; Random walks and Levy flights; Magnetohydrodynamics; plasma turbulence; Magnetohydrodynamic and fluid equation; Fluctuation and chaos phenomena |
2012 |
Interchange Reconnection in a Turbulent Corona Rappazzo, A.~F.; Matthaeus, W.~H.; Ruffolo, D.; Servidio, S.; Velli, M.; Published by: \apjl Published on: 10/2012 YEAR: 2012   DOI: 10.1088/2041-8205/758/1/L14 Parker Data Used; magnetic reconnection; magnetohydrodynamics: MHD; Solar wind; Sun: corona; Sun: magnetic topology; turbulence; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics |
Random Ballistic Interpretation of Nonlinear Guiding Center Theory Ruffolo, D.; Pianpanit, T.; Matthaeus, W.~H.; Chuychai, P.; Published by: \apjl Published on: 03/2012 YEAR: 2012   DOI: 10.1088/2041-8205/747/2/L34 |
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