Speaker
Description
First Name: Christina
Last Name: Cohen
Email Address: cohen@srl.caltech.edu
Affiliation: California Institute of Technology
All Authors: C.M.S. Cohen, G.M. Mason, R.A. Leske, G.C. Ho, R.F. Wimmer-Schweingruber, G.D. Muro, Z.G. Xu
Abstract: In the first half of November 2025, Parker Solar Probe, ACE, Solar Orbiter, and STEREO-A were distributed from 0.7 to 1 AU and ~127° in longitude as active region 14274 rotated across the solar disk emitting a large number of X-class flares, coronal mass ejections (CMEs) and several solar energetic particle (SEP) events, including the largest ground level enhancement (GLE) event of this solar cycle. GLE events often exhibit enhancements in several abundance ratios, including Fe/O and Ne/O, and the November 2025 GLE event appears to have that characteristic. Given the wide longitudinal distribution of the spacecraft, the magnetic connection to the CME-driven shocks, the detection of the shock passages and the associated CMEs is significantly different for each observer and may be reflected in the measured SEP composition. In this study, we examine the SEP composition as a function of energy and time for all four observers throughout this active period to investigate any dependence on longitude (and, to a lesser degree, radius).