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Astrophysics > Solar and Stellar Astrophysics

arXiv:2404.01993 (astro-ph)
[Submitted on 2 Apr 2024]

Title:CME Deflection and East-West Asymmetry of ESP Intensity in Solar Cycles 23 and 24

Authors:Adolfo Santa Fe Dueñas (1), Robert W. Ebert (1 and 2), Gang Li (3), Zheyi Ding (4), Maher A. Dayeh (1 and 2), Mihir I. Desai (1 and 2), Lan K. Jian (5) ((1) Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX, USA, (2) Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, USA, (3) Department of Space Science and CSPAR, University of Alabama in Huntsville, Huntsville, AL, USA, (4) Centre for Mathematical Plasma Astrophysics, KU Leuven, Leuven, Belgium, (5) Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA)
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Abstract: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.
Subjects: Solar and Stellar Astrophysics (astro-ph.SR); Earth and Planetary Astrophysics (astro-ph.EP); High Energy Astrophysical Phenomena (astro-ph.HE); Plasma Physics (physics.plasm-ph); Space Physics (physics.space-ph)
Cite as: arXiv:2404.01993 [astro-ph.SR]
  (or arXiv:2404.01993v1 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.2404.01993

Submission history

From: Adolfo Santa Fe Dueñas [view email]
[v1] Tue, 2 Apr 2024 14:35:09 UTC (3,491 KB)
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