Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3701d&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
We study time evolution of an energy spectrum of a proton flux in the range of 47 4750 keV for the energetic particle event occurred on 255 DOY in 1999. It is found that the energy spectrum in lower energy range, less than 0.5 MeV, enhanced faster, that is, the spectrum gets softer. We also analyze the magnetic field data to find energy dependence of a diffusion coefficient. We perform modeling this event by numerical simulations using Sto chastic Differential Equation method. Our simulation results suggest that insufficiently accelerated particles may exist around 1 AU to explain the evolutionary behavior of the energy spectrum.
den Mitsue
Yamashita Kazuo
Yoshida Tadashi
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