HR: 0830h
AN: SH11D-1140    [PDF]
TI: Effects of pitch-angle scattering and magnetic mirroring beyond 1 AU on solar energetic particles
AU: * Lario, D
EM: david.lario@jhuapl.edu
AF: The Johns Hopkins University. Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723 United States
AU: Agueda, N
EM: nagueda@am.ub.es
AF: Departament d'Astronomia i Meteorologia. Universitat de Barcelona, Marti Franques, 1, Barcelona, 08028 Spain
AU: Sanahuja, B
EM: blai@am.ub.es
AF: Departament d'Astronomia i Meteorologia. Universitat de Barcelona, Marti Franques, 1, Barcelona, 08028 Spain
AU: Roelof, E C
EM: edmond.roelof@jhuapl.edu
AF: The Johns Hopkins University. Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723 United States
AB: We have developed a Monte-Carlo technique to study the time-dependent transport of energetic particles in the interplanetary medium. We use the guiding center approximation between discrete finite pitch-angle scatterings to quantify the competing effects of focusing and pitch-angle scattering on energetic particles propagating along a Parker spiral magnetic field. The problem is formulated in terms of the parallel mean-free-path ($\lambda_{\parallel}$) and the distance traveled along a particle trajectory (s), so using the relation s=vt the results can be easily converted to time-intensity profiles and particle anisotropies observed at various distances from the Sun for electrons, protons and ions of different species. The effects from the presence of a reflecting (mirroring) magnetic boundary beyond 1 AU are discussed and compared with the effects that differential pitch-angle scattering processes produce on ions of different species and energies. The work at APL was partially supported by NASA under grant NAG5-10787. The work at DAM/UB was supported by DGYCT under contract AYA-2001-3304.
DE: 2114 Energetic particles, heliospheric (7514)
DE: 2118 Energetic particles, solar
DE: 7514 Energetic particles (2114)
DE: 7807 Charged particle motion and acceleration
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting