CME Deflection and East-West Asymmetry of ESP Intensity in Solar Cycles 23 and 24
arxiv(2024)
摘要
We investigate the East-West asymmetry in energetic storm particle (ESP)
heavy ion intensities at interplanetary shocks driven by coronal mass ejections
(CMEs) during solar cycles (SCs) 23 and 24. We use observations from NASA's ACE
and STEREO missions of helium (He), oxygen (O), and iron (Fe) intensities from
0.13 to 3 MeV/nucleon. We examine the longitudinal distribution of ESP
intensities and the correlation of ESP intensities with the near-Sun CME speed
and the average transit CME speed for eastern and western events. We observed
an East-West asymmetry reversal of ESP heavy ion intensities from SC 23 to 24.
We have determined that this change in asymmetry is caused by a shift in the
heliolongitude distribution of the CME speed ratio (the ratio of CME near-Sun
speed to CME average transit speed) from west to east.
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