Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh31b1999t&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH31B-1999
Physics
Plasma Physics
[2114] Interplanetary Physics / Energetic Particles, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7863] Space Plasma Physics / Turbulence, [7984] Space Weather / Space Radiation Environment
Scientific paper
The rapid changes in the intensity of solar energetic particles (SEPs) called dropouts, in which the intensity appears and disappears repeatedly, were measured by the ACE spacecraft for impulsive solar flare events and represent the filamentation of the particle distribution. We have explained these features using computer simulations. We evaluate the particle trajectories in slab + 2D spherical harmonic magnetic fields using the fundamental Newton-Lorentz equations in spherical geometry. We simulate the motion of charged particles at different energies in the same magnetic field, which shows that the low energy particles closely follow the slab + 2D spherical harmonic magnetic fields and exhibit dropout features. These features remain and the distribution is even more compact for high energy particles at about 1 AU. Partially supported by NSF SHINE ATM-0752135 and NASA Heliophysics Theory Program NNX08A147G.
Matthaeus William H.
Ruffolo David J.
Tooprakai Paisan
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