An Anisotropy Analysis of Particles from the Sun

Abstract

This research studied the gradual solar flare event on January 20, 2005. The X-ray class of
this flare was X7.1. The released time of the energy particles was at 06.36 UT and the stop time of
them was at 07.26 UT, so the total injection time of this event was about 50 min. The time of the
coronal mass ejections (CMEs) of this event was at 06.43 UT. In this work, we studied and analyzed
the low energy particles from an Ultra ??? Low Energy Isotopic Spectrometer, (ULEIS) instrument on
the Advanced Composition Explorer spacecraft. We included an anisotropy analysis of particles
from the Suprathermal Energetic Particle Telescope System, (STEP) instrument on the Wind
spacecraft. Finally, we found trend of the mean free path increased in energy from particles analysis
from the ULEIS instrument. The range of motion distance of particles along the magnetic field line
was 0.729???1.863 AU. The injection time was 23.345???106.946 min. Mean free path of particles from
the STEP instrument were uncertainty, which were 0.077???1.614 AU and the injection time was
6.043 ??? 1,074.389 min. We found, the distribution of particles from the STEP instrument were more
turbulent more than particles from ULEIS.

Keywords: solar flare, solar energetic particle, solar wind, anisotropy