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Found 10 entries in the Bibliography.
Showing entries from 1 through 10
| 2023 |
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Transport of Cosmic-Ray Electrons from 1 au to the Sun Gamma rays are produced by cosmic-ray (CR) protons interacting with the particles at the solar photosphere and by CR electrons and positrons (CRes) via inverse Compton scattering of solar photons. The former comes from the solar disk while the latter extends beyond the disk. Evaluation of these emissions requires the flux and spectrum of CRs in the vicinity of the Sun, while most observations provide flux and spectra near the Earth, at around 1 au from the Sun. Past estimates of the quiet Sun gamma- ray emission use phenomen ... Petrosian, Vah\; Orlando, Elena; Strong, Andrew; Published by: \apj Published on: jan YEAR: 2023 DOI: 10.3847/1538-4357/aca474 Parker Data Used; cosmic rays; Solar wind; interplanetary turbulence; 329; 1534; 830; Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Solar and Stellar Astrophysics |
| 2022 |
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Galactic Cosmic-Ray Propagation in the Inner Heliosphere: Improved Force-field Model Li, Jung-Tsung; Beacom, John; Peter, Annika; Published by: \apj Published on: sep YEAR: 2022 DOI: 10.3847/1538-4357/ac8cf3 Parker Data Used; cosmic rays; Galactic cosmic rays; Gamma-ray astronomy; Gamma-ray observatories; Magnetohydrodynamics; Plasma astrophysics; Particle astrophysics; High energy astrophysics; Solar Physics; interplanetary turbulence; 329; 567; 628; 632; 1964; 1261; 96; 739; 1476; 830; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - High Energy Astrophysical Phenomena; High Energy Physics - Phenomenology; Physics - Plasma Physics; Physics - Space Physics |
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Relativistic Particle Transport and Acceleration in Structured Plasma Turbulence We discuss the phenomenon of energization of relativistic charged particles in three-dimensional incompressible MHD turbulence and the diffusive properties of the motion of the same particles. We show that the random electric field induced by turbulent plasma motion leads test particles moving in a simulated box to be accelerated in a stochastic way, a second-order Fermi process. A small fraction of these particles happen to be trapped in large- scale structures, most likely formed due to the interaction of islands in the tu ... Pezzi, Oreste; Blasi, Pasquale; Matthaeus, William; Published by: \apj Published on: mar YEAR: 2022 DOI: 10.3847/1538-4357/ac5332 Parker Data Used; Magnetohydrodynamics; cosmic rays; Particle astrophysics; 1964; 329; 96; Astrophysics - High Energy Astrophysical Phenomena; Physics - Plasma Physics |
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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 |
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Energetic particles, such as stellar cosmic rays, produced at a heightened rate by active stars (like the young Sun) may have been important for the origin of life on Earth and other exoplanets. Here, we compare, as a function of stellar rotation rate (Ω), contributions from two distinct populations of energetic particles: stellar cosmic rays accelerated by impulsive flare events and Galactic cosmic rays. We use a 1.5D stellar wind model combined with a spatially 1D cosmic ray transport model. We formulate the evolution of ... Rodgers-Lee, D.; Taylor, A.; Vidotto, A.; Downes, T.; Published by: Monthly Notices of the Royal Astronomical Society Published on: 06/2021 YEAR: 2021 DOI: 10.1093/mnras/stab935 diffusion; methods: numerical; Sun: evolution; stars: magnetic field; cosmic rays; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - High Energy Astrophysical Phenomena |
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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 |
| 2017 |
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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 |
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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 |
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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 |
| 2015 |
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Localized enhancements of energetic particles at oblique collisionless shocks Fraschetti, F.; Giacalone, J.; Published by: \mnras Published on: 04/2015 YEAR: 2015 DOI: 10.1093/mnras/stv247 Parker Data Used; turbulence; cosmic rays; ISM: magnetic fields; Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics; Physics - Space Physics |
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