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Found 18 entries in the Bibliography.
Showing entries from 1 through 18
| 2022 |
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Energetic electrons of Jovian origin have been observed for decades throughout the heliosphere, as far as 11 au, and as close as 0.5 au, from the Sun. The treatment of Jupiter as a continuously emitting point source of energetic electrons has made Jovian electrons a valuable tool in the study of energetic electron transport within the heliosphere. We present observations of Jovian electrons measured by the EPI-Hi instrument in the Integrated Science Investigation of the Sun instrument suite on Parker Solar Probe at distances ... Mitchell, J.~G.; Leske, R.~A.; De Nolfo, G.~A.; Christian, E.~R.; Wiedenbeck, M.~E.; McComas, D.~J.; Cohen, C.~M.~S.; Cummings, A.~C.; Hill, M.~E.; Labrador, A.~W.; Mays, M.~L.; McNutt, R.~L.; Mewaldt, R.~A.; Mitchell, D.~G.; Odstrcil, D.; Schwadron, N.~A.; Stone, E.~C.; Szalay, J.~R.; Published by: \apj Published on: jul YEAR: 2022 DOI: 10.3847/1538-4357/ac75ce Parker Data Used; Interplanetary particle acceleration; Solar energetic particles; Corotating streams; interplanetary magnetic fields; Heliosphere; 826; 1491; 314; 824; 711 |
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Anomalous Cosmic-Ray Oxygen Observations into 0.1 au The Integrated Science Investigation of the Sun instrument suite onboard NASA s Parker Solar Probe mission continues to measure solar energetic particles and cosmic rays closer to the Sun than ever before. Here, we present the first observations of cosmic rays into 0.1 au (21.5 solar radii), focusing specifically on oxygen from \raisebox-0.5ex\textasciitilde2018.7 to \raisebox-0.5ex\textasciitilde2021.2. Our energy spectra reveal an anomalous cosmic-ray-dominated profile that is comparable to that at 1 au, across multiple so ... Rankin, J.~S.; McComas, D.~J.; Leske, R.~A.; Christian, E.~R.; Cohen, C.~M.~S.; Cummings, A.~C.; Joyce, C.~J.; Labrador, A.~W.; Mewaldt, R.~A.; Schwadron, N.~A.; Stone, E.~C.; Strauss, R.~D.; Wiedenbeck, M.~E.; Published by: \apj Published on: jan YEAR: 2022 DOI: 10.3847/1538-4357/ac348f Parker Data Used; 567; 329; 1487; 1193; 1503; 1476; 1534; 96; 1544; 711; 1322; 830; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics |
| 2021 |
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Solar energetic particle heavy ion properties in the widespread event of 2020 November 29 Context. Following a multi-year minimum of solar activity, a solar energetic particle event on 2020 Nov. 29 was observed by multiple spacecraft covering a wide range of solar longitudes including ACE, the Solar Terrestrial Relations Observatory-A, and the recently launched Parker Solar Probe and Solar Orbiter. \ Aims: Multi-point observations of a solar particle event, combined with remote-sensing imaging of flaring, shocks, and coronal mass ejections allows for a global picture of the event to be synthesized, and made avail ... Mason, G.~M.; Cohen, C.~M.~S.; Ho, G.~C.; Mitchell, D.~G.; Allen, R.~C.; Hill, M.~E.; Andrews, G.~B.; Berger, L.; Boden, S.; Böttcher, S.; Cernuda, I.; Christian, E.~R.; Cummings, A.~C.; Davis, A.~J.; Desai, M.~I.; De Nolfo, G.~A.; Eldrum, S.; Elftmann, R.; Kollhoff, A.; Giacalone, J.; omez-Herrero, R.; Hayes, J.; Janitzek, N.~P.; Joyce, C.~J.; Korth, A.; Kühl, P.; Kulkarni, S.~R.; Labrador, A.~W.; Lara, Espinosa; Lees, W.~J.; Leske, R.~A.; Mall, U.; Martin, C.; in, Mart\; Matthaeus, W.~H.; McComas, D.~J.; McNutt, R.~L.; Mewaldt, R.~A.; Mitchell, J.~G.; Pacheco, D.; Espada, Parra; Prieto, M.; Rankin, J.~S.; Ravanbakhsh, A.; iguez-Pacheco, Rodr\; Polo, Rodr\; Roelof, E.~C.; anchez-Prieto, S.; Schlemm, C.~E.; Schwadron, N.~A.; Seifert, H.; Stone, E.~C.; Szalay, J.~R.; Terasa, J.~C.; Tyagi, K.; von Forstner, J.~L.; Wiedenbeck, M.~E.; Wimmer-Schweingruber, R.~F.; Xu, Z.~G.; Yedla, M.; Published by: \aap Published on: dec YEAR: 2021 DOI: 10.1051/0004-6361/202141310 Parker Data Used; acceleration of particles; Sun: abundances; Sun: flares; Sun: particle emission |
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PSP/IS\ensuremath\odotIS observations of the 29 November 2020 solar energetic particle event \ Aims: On 29 November 2020, at 12:34 UT, active region 12790 erupted with an M4.4 class flare and a 1700 km s$^\ensuremath-1$ coronal mass ejection. Parker Solar Probe (PSP) was completing its seventh orbit around the Sun and was located at 0.8 au when the Integrated Science Investigation of the Sun (IS\ensuremath\odotIS) measured the ensuing mid- sized solar energetic particle (SEP) event. Not only was this the first SEP event with heavy ions above 10 MeV nuc$^\ensuremath-1$ to be measured by IS\ensuremath\odotIS, it was a ... Cohen, C.~M.~S.; Christian, E.~R.; Cummings, A.~C.; Davis, A.~J.; Desai, M.~I.; De Nolfo, G.~A.; Giacalone, J.; Hill, M.~E.; Joyce, C.~J.; Labrador, A.~W.; Leske, R.~A.; Matthaeus, W.~H.; McComas, D.~J.; McNutt, R.~L.; Mewaldt, R.~A.; Mitchell, D.~G.; Mitchell, J.~G.; Rankin, J.~S.; Roelof, E.~C.; Schwadron, N.~A.; Stone, E.~C.; Szalay, J.~R.; Wiedenbeck, M.~E.; Vourlidas, A.; Bale, S.~D.; Pulupa, M.; MacDowall, R.~J.; Published by: \aap Published on: dec YEAR: 2021 DOI: 10.1051/0004-6361/202140967 Parker Data Used; Sun: particle emission; Sun: activity; solar-terrestrial relations |
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Time evolution of stream interaction region energetic particle spectra in the inner heliosphere We analyze an energetic proton event associated with a stream interaction region (SIR) that was observed at Parker Solar Probe on day 320 of 2018 when the spacecraft was just 0.34 AU from the Sun. Using the Integrated Science Investigation of the Sun instrument suite, we perform a spectral analysis of the event and show how the observed spectra evolve over the course of the event. We find that the spectra from the first day of the event are much more consistent with local acceleration at a weak compression, while spectra fro ... Joyce, C.; McComas, D.; Schwadron, N.; Christian, E.; Wiedenbeck, M.; McNutt, R.; Cohen, C.; Leske, R.; Mewaldt, R.; Stone, E.; Labrador, A.; Davis, A.; Cummings, A.; Mitchell, D.; Hill, M.; Roelof, E.; Allen, R.; Szalay, J.; Rankin, J.; Desai, M.; Giacalone, J.; Matthaeus, W.; Bale, S.; Kasper, J.; Published by: Astronomy and Astrophysics Published on: 06/2021 YEAR: 2021 DOI: 10.1051/0004-6361/202039330 acceleration of particles; Solar wind; magnetic fields; Parker Data Used |
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Context. Silicon solid-state detectors are commonly used for measuring the specific ionization, dE∕dx, in instruments designed for identifying energetic nuclei using the dE∕dx versus total energy technique in space and in the laboratory. The energy threshold and species resolution of the technique strongly depend on the thickness and thickness uniformity of these detectors. Wiedenbeck, M.; Burnham, J.; Cohen, C.; Cook, W.; Crabill, R.; Cummings, A.; Davis, A.; Kecman, B.; Labrador, A.; Leske, R.; Mewaldt, R.; Rankin, J.; Rusert, M.; Stone, E.; Christian, E.; Goodwin, P.; Link, J.; Nahory, B.; Shuman, S.; von Rosenvinge, T.; Tindall, C.; Black, H.; Bullough, M.; Clarke, N.; Glasson, V.; Greenwood, N.; Hawkins, C.; Johnson, T.; Newton, A.; Richardson, K.; Walsh, S.; Wilburn, C.; Birdwell, B.; Everett, d.; McComas, D.; Weidner, S.; Angold, N.; Schwadron, N.; Published by: Astronomy and Astrophysics Published on: 06/2021 YEAR: 2021 DOI: 10.1051/0004-6361/202039754 instrumentation: detectors; Sun: particle emission; acceleration of particles; space vehicles: instruments; Parker Data Used |
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Parker Solar Probe observations of He/H abundance variations in SEP events inside 0.5 au
Cohen, C.; Christian, E.; Cummings, A.; Davis, A.; Desai, M.; de Nolfo, G.; Giacalone, J.; Hill, M.; Joyce, C.; Labrador, A.; Leske, R.; Matthaeus, W.; McComas, D.; McNutt, R.; Mewaldt, R.; Mitchell, D.; Mitchell, J.; Rankin, J.; Roelof, E.; Schwadron, N.; Stone, E.; Szalay, J.; Wiedenbeck, M.; Vourlidas, A.; Bale, S.; Pulupa, M.; MacDowall, R.; Published by: Astronomy and Astrophysics Published on: 06/2021 YEAR: 2021 DOI: 10.1051/0004-6361/202039299 Sun: particle emission; Sun: activity; solar-terrestrial relations; Parker Data Used |
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First Observations of Anomalous Cosmic Rays in to 36 Solar Radii NASA s Parker Solar Probe mission continues to travel closer to the Sun than any prior human-made object, with an expected closest approach of <10 solar radii (<0.046 au) by 2024. On board, the Integrated Science Investigation of the Sun instrument suite makes unprecedented in situ measurements of energetic particles in the near-Sun environment. The current low level of solar activity offers a prime opportunity to measure cosmic rays closer to the Sun than ever before. We present the first observations of anomalous cosmic ra ... Rankin, J.; McComas, D.; Leske, R.; Christian, E.; Cohen, C.; Cummings, A.; Joyce, C.; Labrador, A.; Mewaldt, R.; Posner, A.; Schwadron, N.; Strauss, R.; Stone, E.; Wiedenbeck, M.; Published by: The Astrophysical Journal Published on: 05/2021 YEAR: 2021 DOI: 10.3847/1538-4357/abec7e cosmic rays; Solar wind; Heliosphere; Solar energetic particles; Solar Physics; solar cycle; Quiet Sun; Particle astrophysics; interplanetary magnetic fields; Plasma astrophysics; Interplanetary particle acceleration; Pickup ions; 329; 1534; 711; 1491; 1476; 1487; 1322; 96; 824; 1261; 826; 1239; Parker Data Used |
| 2020 |
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Energetic Particle Increases Associated with Stream Interaction Regions The Parker Solar Probe was launched on 2018 August 12 and completed its second orbit on 2019 June 19 with perihelion of 35.7 solar radii. During this time, the Energetic Particle Instrument-Hi (EPI-Hi, one of the two energetic particle instruments comprising the Integrated Science Investigation of the Sun, IS☉IS) measured seven proton intensity increases associated with stream interaction regions (SIRs), two of which appear to be occurring in the same region corotating with the Sun. The events are relatively weak, with ... Cohen, C.; Christian, E.; Cummings, A.; Davis, A.; Desai, M.; Giacalone, J.; Hill, M.; Joyce, C.; Labrador, A.; Leske, R.; Matthaeus, W.; McComas, D.; McNutt, R.; Mewaldt, R.; Mitchell, D.; Rankin, J.; Roelof, E.; Schwadron, N.; Stone, E.; Szalay, J.; Wiedenbeck, M.; Allen, R.; Ho, G.; Jian, L.; Lario, D.; Odstrcil, D.; Bale, S.; Badman, S.; Pulupa, M.; MacDowall, R.; Kasper, J.; Case, A.; Korreck, K.; Larson, D.; Livi, Roberto; Stevens, M.; Whittlesey, Phyllis; Published by: The Astrophysical Journal Supplement Series Published on: 02/2020 YEAR: 2020 DOI: 10.3847/1538-4365/ab4c38 Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Space Physics; Solar Probe Plus |
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The Integrated Science Investigations of the Sun (IS☉IS) instrument suite includes two Energetic Particle instruments: EPI-Hi, designed to measure ions from ̃1 to 200 MeV nuc-1, and EPI-Lo, designed to measure ions from ̃20 to ̃15 MeV nuc-1. We present an analysis of eight energetic proton events observed across the energy range of both instruments during Parker Solar Probe\textquoterights (PSP) first two orbits in order to examine their combined energy spectra. Background corrections are applie ... Joyce, C.; McComas, D.; Christian, E.; Schwadron, N.; Wiedenbeck, M.; McNutt, R.; Cohen, C.; Leske, R.; Mewaldt, R.; Stone, E.; Labrador, A.; Davis, A.; Cummings, A.; Mitchell, D.; Hill, M.; Roelof, E.; Szalay, J.; Rankin, J.; Desai, M.; Giacalone, J.; Matthaeus, W.; Published by: The Astrophysical Journal Supplement Series Published on: 02/2020 YEAR: 2020 DOI: 10.3847/1538-4365/ab5948 Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Space Physics; Solar Probe Plus |
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Observations of the 2019 April 4 Solar Energetic Particle Event at the Parker Solar Probe A solar energetic particle event was detected by the Integrated Science Investigation of the Sun (IS☉IS) instrument suite on Parker Solar Probe (PSP) on 2019 April 4 when the spacecraft was inside of 0.17 au and less than 1 day before its second perihelion, providing an opportunity to study solar particle acceleration and transport unprecedentedly close to the source. The event was very small, with peak 1 MeV proton intensities of ̃0.3 particles (cm2 sr s MeV)-1, and was undetectable above backgro ... Leske, R.; Christian, E.; Cohen, C.; Cummings, A.; Davis, A.; Desai, M.; Giacalone, J.; Hill, M.; Joyce, C.; Krimigis, S.; Labrador, A.; Malandraki, O.; Matthaeus, W.; McComas, D.; McNutt, R.; Mewaldt, R.; Mitchell, D.; Posner, A.; Rankin, J.; Roelof, E.; Schwadron, N.; Stone, E.; Szalay, J.; Wiedenbeck, M.; Vourlidas, A.; Bale, S.; MacDowall, R.; Pulupa, M.; Kasper, J.; Allen, R.; Case, A.; Korreck, K.; Livi, R.; Stevens, M.; Whittlesey, P.; Poduval, B.; Published by: The Astrophysical Journal Supplement Series Published on: 02/2020 YEAR: 2020 DOI: 10.3847/1538-4365/ab5712 Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Space Physics; Solar Probe Plus |
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Seed Population Preconditioning and Acceleration Observed by the Parker Solar Probe A series of solar energetic particle (SEP) events was observed by the Integrated Science Investigation of the Sun (IS☉IS) on the Parker Solar Probe (PSP) during the period from 2019 April 18 through 24. The PSP spacecraft was located near 0.48 au from the Sun on Parker spiral field lines that projected out to 1 au within ̃25\textdegree of the near-Earth spacecraft. These SEP events, though small compared to historically large SEP events, were among the largest observed thus far in the PSP mission and provide critical i ... Schwadron, N.; Bale, S.; Bonnell, J.; Case, A.; Christian, E.; Cohen, C.; Cummings, A.; Davis, A.; de Wit, Dudok; de Wet, W.; Desai, M.; Joyce, C.; Goetz, K.; Giacalone, J.; Gorby, M.; Harvey, P.; Heber, B.; Hill, M.; Karavolos, M.; Kasper, J.; Korreck, K.; Larson, D.; Livi, R.; Leske, R.; Malandraki, O.; MacDowall, R.; Malaspina, D.; Matthaeus, W.; McComas, D.; McNutt, R.; Mewaldt, R.; Mitchell, D.; Mays, L.; Niehof, J.; Odstrcil, D.; Pulupa, M.; Poduval, B.; Rankin, J.; Roelof, E.; Stevens, M.; Stone, E.; Szalay, J.; Wiedenbeck, M.; Winslow, R.; Whittlesey, P.; Published by: The Astrophysical Journal Supplement Series Published on: 02/2020 YEAR: 2020 DOI: 10.3847/1538-4365/ab5527 Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Space Physics; Solar Probe Plus |
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3 He-rich Solar Energetic Particle Observations at the Parker Solar Probe and near Earth The Integrated Science Investigation of the Sun (IS☉IS) instrument suite on the Parker Solar Probe (PSP) spacecraft is making in situ observations of energetic ions and electrons closer to the Sun than any previous mission. Using data collected during its first two orbits, which reached perihelion distances of 0.17 au, we have searched for \ 3\ He\ 3He -rich solar energetic particle (SEP) events under very quiet solar minimum conditions. On 2019-110-111 (April 20-21), \ 3\ He\ 3He -rich SEP ... Wiedenbeck, M.; ik, Bu\v; Mason, G.; Ho, G.; Leske, R.; Cohen, C.; Christian, E.; Cummings, A.; Davis, A.; Desai, M.; Giacalone, J.; Haggerty, D.; Hill, M.; Joyce, C.; Labrador, A.; Malandraki, O.; Matthaeus, W.; McComas, D.; McNutt, R.; Mewaldt, R.; Mitchell, D.; Posner, A.; Rankin, J.; Roelof, E.; Schwadron, N.; Stone, E.; Szalay, J.; Bale, S.; Case, A.; Kasper, J.; Korreck, K.; Larson, D.; MacDowall, R.; Pulupa, M.; Stevens, M.; Published by: The Astrophysical Journal Supplement Series Published on: 02/2020 YEAR: 2020 DOI: 10.3847/1538-4365/ab5963 |
| 2019 |
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Probing the energetic particle environment near the Sun NASA\textquoterights Parker Solar Probe mission recently plunged through the inner heliosphere of the Sun to its perihelia, about 24 million kilometres from the Sun. Previous studies farther from the Sun (performed mostly at a distance of 1 astronomical unit) indicate that solar energetic particles are accelerated from a few kiloelectronvolts up to near-relativistic energies via at least two processes: "impulsive" events, which are usually associated with magnetic reconnection in solar flares and are typically enriched in ... McComas, D.; Christian, E.; Cohen, C.; Cummings, A.; Davis, A.; Desai, M.; Giacalone, J.; Hill, M.; Joyce, C.; Krimigis, S.; Labrador, A.; Leske, R.; Malandraki, O.; Matthaeus, W.; McNutt, R.; Mewaldt, R.; Mitchell, D.; Posner, A.; Rankin, J.; Roelof, E.; Schwadron, N.; Stone, E.; Szalay, J.; Wiedenbeck, M.; Bale, S.; Kasper, J.; Case, A.; Korreck, K.; MacDowall, R.; Pulupa, M.; Stevens, M.; Rouillard, A.; Published by: Nature Published on: 12/2019 YEAR: 2019 DOI: 10.1038/s41586-019-1811-1 |
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Given increasing complexity of many safety-critical systems, many organizations like NASA need to identify when, where, and how inappropriate perceptions of risk and anchoring of trust affect technology development and acceptance, primarily from the perspective of engineers and related management. Using the adoption of Dynamic Radioisotope Power Systems (RPS) for space exploration as a backdrop, we define and explain factors that contribute to inappropriate risk perception of various stakeholders. Three case studies (Mars Sc ... Brummel, Scott; Ostdiek, Paul; Woerner, Dave; Hibbard, Kenneth; Stofan, Ellen; Zakrajsek, June; Cummings, Mary; Published by: IEEE Aerospace Conference Proceedings Published on: YEAR: 2019 DOI: 10.1109/AERO.2019.8742171 Budget control; Martian surface analysis; NASA; Nuclear batteries; Planning; Probes; Radioisotopes; Safety engineering; Solar energy; Space flight; Parker Engineering |
| 2017 |
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NASA\textquoterights Parker Solar Probe (PSP) spacecraft (formerly Solar Probe Plus) is scheduled for launch in July 2018 with a planned heliocentric orbit that will carry it on a series of close passes by the Sun with perihelion distances that eventually will get below 10 solar radii. Among other in-situ and imaging sensors, the PSP payload includes the two-instrument \textquotedblleftIntegrated Science Investigation of the Sun\textquotedblright suite, which will make coordinated measurements of energetic ions and electr ... Wiedenbeck, M.; Angold, N.; Birdwell, B.; Burnham, J.; Christian, E.; Cohen, C.; Cook, W.; Cummings, A.; Davis, A.; Dirks, G.; Do, D.; Everett, d.; Goodwin, P.; Hanley, J.; Hernandez, L.; Kecman, B.; Klemic, J.; Labrador, A.; Leske, R.; Lopez, S.; Link, J.; McComas, D.; Mewaldt, R.; Miyasaka, H.; Nahory, B.; Rankin, J.; Riggans, G.; Rodriguez, B.; Rusert, M.; Shuman, S.; Simms, K.; Stone, E.; von Rosenvinge, T.; Weidner, S.; White, M.; Published by: Published on: 10/2017 YEAR: 2017 DOI: 10.22323/1.301.0016 |
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NASA s Parker Solar Probe (PSP) spacecraft (formerly Solar Probe Plus) is scheduled for launch in July 2018 with a planned heliocentric orbit that will carry it on a series of close passes by the Sun with perihelion distances that eventually will get below 10 solar radii. Among other in-situ and imaging sensors, the PSP payload includes the two-instrument "Integrated Science Investigation of the Sun" suite, which will make coordinated measurements of energetic ions and electrons. The high-energy instrument (EPI-Hi), operatin ... Wiedenbeck, M.E.; Angold, N.G.; Birdwell, B.; Burnham, J.A.; Christian, E.R.; Cohen, C.M.S.; Cook, W.R.; Crabill, R.M.; Cummings, A.C.; Davis, A.J.; Dirks, G.; Do, D.H.; Everett, D.T.; Goodwin, P.A.; Hanley, J.J.; Hernandez, L.; Kecman, B.; Klemic, J.; Labrador, A.W.; Leske, R.A.; Lopez, S.; Link, J.T.; McComas, D.J.; Mewaldt, R.A.; Miyasaka, H.; Nahory, B.W.; Rankin, J.S.; Riggans, G.; Rodriguez, B.; Rusert, M.D.; Shuman, S.A.; Simms, K.M.; Stone, E.C.; Von Rosenvinge, T.T.; Weidner, S.E.; White, M.L.; Published by: Proceedings of Science Published on: cosmic rays; Cosmology; NASA; Orbits; Probes; Radioactivity; Parker Engineering |
| 2014 |
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Integrated Science Investigation of the Sun (ISIS): Design of the Energetic Particle Investigation 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\textquoterights 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)\ O ... McComas, D.; Alexander, N.; Angold, N.; Bale, S.; Beebe, C.; Birdwell, B.; Boyle, M.; Burgum, J.; Burnham, J.; Christian, E.; Cook, W.; Cooper, S.; Cummings, A.; Davis, A.; Desai, M.; Dickinson, J.; Dirks, G.; Do, D.; Fox, N.; Giacalone, J.; Gold, R.; Gurnee, R.; Hayes, J.; Hill, M.; Kasper, J.; Kecman, B.; Klemic, J.; Krimigis, S.; Labrador, A.; Layman, R.; Leske, R.; Livi, S.; Matthaeus, W.; McNutt, R.; Mewaldt, R.; Mitchell, D.; Nelson, K.; Parker, C.; Rankin, J.; Roelof, E.; Schwadron, N.; Seifert, H.; Shuman, S.; Stokes, M.; Stone, E.; Vandegriff, J.; Velli, M.; von Rosenvinge, T.; Weidner, S.; Wiedenbeck, M.; Wilson, P.; Published by: Space Science Reviews Published on: 07/2014 YEAR: 2014 DOI: 10.1007/s11214-014-0059-1 CMEs; Corona; ISIS; Parker Data Used; Particle acceleration; SEPs; Solar energetic particles; Solar Probe Plus |
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