Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh33a1815h&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH33A-1815
Physics
Plasma Physics
[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration
Scientific paper
It is important to determine solar energetic particles' (SEPs) mean free path from physical properties of SEPs as well as those of solar wind. To accurately obtain the mean free path of SEPs for a solar event, people usually fit time-profiles of both flux and anisotropy between spacecraft observations and numerical simulations of SEPs transport process. We call it simulation method. However, such kind of fitting and simulations need a large amount of calculation resources, so they are time-consuming even with modern super-computers. It is necessary to find a easy way to get mean free path of SEPs in some circumstances, especially in space weather forecast. Recently, Shalchi et al. (Astronomy and Astrophysics, 2009, 507, 589-597) provided an approximate analytical formula of SEPs' anisotropy time-profile as a function of particles' mean free path for impulsive events. In this paper, we use a so-called analytical method to determine SEPs' mean free path by fitting the anisotropy time-profiles between the Shalchi et al.'s analytical formula and spacecraft observations. In addition, we compare the mean free path obtained with the traditional simulation method with that obtained with the analytical method to show that the analytical method, with some modifications, can give us a good approximation of SEPs' mean free path quickly for impulsive events.
He Hailun
Qin Gan
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