SH009-0006
Understanding Solar Energetic Particle Events and CME Dynamics in the Low Corona using MLSO and Spacebased Coronagraph Observations – Progress Report

Tuesday, 8 December 2020
Poster
O C St Cyr, NASA GSFC, Greenbelt, MD, United States; Universities Space Research Association Greenbelt, Heliophysics Science Division, Greenbelt, MD, United States, Ian G Richardson, NASA Goddard Space Flight Center, Heliophysics Science Division, Greenbelt, MD, United States, Barbara J Thompson, NASA/GSFC, Greenbelt, MD, United States, Joan Burkepile, National Center for Atmospheric Research, High Altitude Observatory, Boulder, CO, United States, Laura Balmaceda, George Mason University, Fairfax, VA, United States and Dan J Fry, NASA Johnson Space Center, Houston, TX, United States
Abstract:
We report here on the initial accelerations of coronal mass ejections (CMEs) associated with 25 MeV solar energetic proton events (SEPs) during the period 1980-1996. Primary CME observations in the low corona were obtained at Mauna Loa Solar Observatory (MLSO) and, where possible, they were combined with spacebased observations from the SMM C/P and P78-1 Solwind coronagraphs. We identified 21 SEPs with associated MLSO observations, and we were able to combine 12 of those with the spacebased coronagraphs to reveal the initial and mid-coronal acceleration of the SEP-associated CMEs. We compared them with 13 fast CMEs detected by MLSO during the same period with no SEPs. The low-to-middle coronal accelerations of the SEP-associated CMEs was significantly larger than for those without SEPs. We will show examples of these statistics, and we will describe our progress extending this work into the SOHO-LASCO era (1996-present).
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