Study of Solar Energetic Particles (SEPs) Using Largely Separated Spacecraft
Technical Report,01 Sep 2013,31 Aug 2016
KYUNG HEE UNIVERSITY, RESEARCH AND UNIVERSITY-INDUSTRY CORPORATION Seoul Korea, South
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Solar energetic particles are one of important phenomena in the Sun. They are mainly accelerated by magnetic field reconnections of flares and CME-driven shocks so that the characteristics of SEPs are strongly associated with physical quantities of related solar activities. In addition, SEPs are a major component in terms of space weather. In the present study, we examine the relationships between SEPs and related solar activities EUV Extreme-ultraviolet waves, flares and CMEs. From spacecraft largely separated, we observe SEPs and related solar activities with multiple points of view. The major results of the present study are as follows. 1 SEP onset times and SEP peak fluxes at 1 AU are significantly associated with EUV wave arrival times and EUV wave speeds at the photospheric magnetic footpoints of spacecraft connecting open magnetic field lines. This result supports that EUV waves reflect the lateral expansion of CME-driven shocks in corona region. 2 On the study of the dependence of SEP on CME and flare parameters, SEP occurrence probabilities and SEP peak fluxes increase with CME speed, CME angular width, flare peak flux, flare impulsive time and source longitude from east to west. 3 On the study of SEPs using 3-dimensional CME parameters obtained from multiple spacecraft, there are positive correlations between SEP peak fluxes and CME speeds as well as angular widths. The highest association with SEP peak fluxes is found in longitudinal separation angles from magnetic footpoints of spacecraft to SEP source longitudes.