Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh22a..04c&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH22A-04
Physics
Plasma Physics
[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7833] Space Plasma Physics / Mathematical And Numerical Techniques, [7859] Space Plasma Physics / Transport Processes
Scientific paper
We study the transport of solar energetic particles (SEPs) in the inner heliosphere in order to relate observations made by an observer at 1 AU to the total energy content of particles at the source, assumed to be near the Sun. We use a numerical simulation that integrates the trajectories of a large number of individual particles moving in the interplanetary magnetic field. We model pitch-angle scattering and adiabatic cooling of energetic ions with energies from 50 keV/nucleon to 100 MeV/nucleon. Among other things, we determine the number of times that particles of a given energy cross 1 AU and the average energy loss that they suffer due to adiabatic deceleration in the solar wind. We use a number of different forms of the interplanetary spatial diffusion coefficient, a wide range of scattering mean-free paths, and consider a number of different ion species in order to generate a wide range of simulation results that can be applied to individual SEP events. Our results are used to estimate the total energy needed to accelerate particles for an event on 20 February 2002 based on observations made at 1 AU. We find that estimates of the source energy based on SEP measurements at 1 AU are relatively insensitive to mean free path and scattering scheme.
Chollet Eileen
Giacalone Joe
Mewaldt Richard A.
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