Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh21a1493h&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH21A-1493
Physics
Plasma Physics
[2104] Interplanetary Physics / Cosmic Rays, [2114] Interplanetary Physics / Energetic Particles, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration
Scientific paper
Recently there is breakthrough in the theoretical simulation study of energetic particle diffusion in highly turbulent interplanetary magnetic field. It is shown that perpendicular diffusion is not ignorable in the transport of solar energetic particles (SEP) from the sun to Earth. Numerical calculation of SEP propagation in the 3-dimensional interplanetary magnetic field with perpendicular diffusion can be used to explain many observational phenomena, such as the SEP reservoir phenomenon. We have further studied the effects of source location on the sun on the propagation of SEPs by varying the source latitude and longitude coverage. We calculated the temporal and spatial variations of SEP flux and anisotropy arriving at various locations in the heliosphere. We found that, in model with perpendicular diffusion, the SEP source latitude and longitude coverage has a great effect on observed SEP flux and anisotropy profiles. SEP fluxes observed on the field lines directly connected the SEP source generally have larger intensity, but on the lines that are not connected the SEP flux can still be significant. The farther the foot point of the field lines is away from the source, the smaller the particle flux is observed and also the later SEP flux increases will appear. In addition we show that when the observer's IMF foot point is very far away from the source, e.g., 60 degrees in longitude or larger, the first arriving SEPs' anisotropy could be toward the sun. Currently, we are searching for those events in SEP measurements obtained by spacecraft.
He Hailun
Qin Gan
Zhang Minghui
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