Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh42b..06z&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH42B-06
Physics
Plasma Physics
[2114] Interplanetary Physics / Energetic Particles, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7845] Space Plasma Physics / Particle Acceleration
Scientific paper
By now the two spacecraft of the SETERO mission and other spacecraft in Earth orbit have been well separated in solar longitude. This gives us a new opportunity to look at the longitudinal variation of solar energetic particle source, as these spacecraft are located at the same radial distance of ~1 AU from the sun so that the radial dependence of particle interplanetary transport can be minimized. Observations of solar energy particle events of August 2010 show that the source of solar energetic particles must be highly longitude-dependent even though the size of CME is large. We have developed a model of solar energetic particle propagation in a 3-d interplanetary magnetic field of Parker type. The model includes essentially all the particle transport mechanisms: streaming along magnetic fields, convection with the solar wind, pitch-angle diffusion, magnetic focusing, cross-field diffusion, and adiabatic cooling with pitch-angle dependence. We solve a Fokker-Planck transport equation using stochastic process simulation in a fixed reference frame to obtain particle intensity and isotropy profiles as would seen by a nearly stationary spacecraft. Our calculations can show that particles can come from completely unconnected CME event through particle transport across magnetic field lines. Generally, within a few days, high-energy solar energetic particles from limited source longitudes and latitudes can reach a nearly uniform intensity and the intensity decays at a roughly same rate throughout the entire inner heliosphere. In this talk, the physics of particle transport that controls the intensity level and variation of solar energetic particles will be discussed.
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