Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh32b..01r&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH32B-01
Physics
7807 Charged Particle Motion And Acceleration, 2118 Energetic Particles, Solar, 2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma
Scientific paper
We present a comprehensive survey of effects of interplanetary magnetic mirroring on the pitch-angle transport of energetic particles from the Sun, obtained by numerically solving the appropriate transport equation. We consider a magnetic bottleneck associated with a coronal mass ejection (CME), e.g., where interplanetary magnetic field lines are distorted and compressed due to the CME. Effects include the ``regeneration'' of a coherent pulse at a magnetic bottleneck, a selective collimation effect in which only particles moving almost directly along the magnetic field can pass through; thus an observer beyond the bottleneck sees a very narrow pitch-angle distribution. This may provide an alternate interpretation of some ``scatter-free'' events, in which narrow, highly anisotropic pulses of solar energetic particles have previously been interpreted as indicating very weak interplanetary scattering (a mean free path of several AU). While particles moving nearly along the magnetic field pass through the bottleneck, the remainder of the particles are reflected back toward the Sun and can strongly enhance the flux observed at a location inward of the bottleneck. Our framework can also examine the complex anisotropies inward of the bottleneck, and address a proposed explanation of observed anisotropies in the solar wind electron halo. Partially supported by the Thailand Research Fund.
Ruffolo David J.
Rujiwarodom Manit
Tooprakai Paisan
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