SH33B-2463
Analysis of the Longitudinal Variation of Energetic Particle Radiation during the 23 July 2012 Solar Event Using STEREO and LRO/CRaTER with the BRYNTRN Model
Wednesday, 16 December 2015
Poster Hall (Moscone South)
Colin J Joyce1, Nathan Schwadron2, Lawrence W Townsend3, Richard A Mewaldt4, Christina MS Cohen4, Tycho T von Rosenvinge5, Anthony W Case6, Harlan E. Spence2, Jody Keith Wilson2, Matt Gorby2, Marty Scott Quinn7 and Cary Zeitlin8, (1)University of New Hampshire Main Campus, Durham, NH, United States, (2)University of New Hampshire Main Campus, Space Science Center, Durham, NH, United States, (3)University of Tennessee, Knoxville, TN, United States, (4)California Institute of Technology, Pasadena, CA, United States, (5)NASA Goddard SFC, Greenbelt, MD, United States, (6)Smithsonian Astrophysical Observatory, Cambridge, MA, United States, (7)University of New Hampshire Main Campus, Durham, United States, (8)Southwest Research Institute Boulder, Boulder, CO, United States
Abstract:
During the 23 July 2012 solar event, STEREO A/B and the Earth were ideally positioned to show how the longitudinal position of the observer relative to the ICME affects the measured radiation. Using energetic proton flux measurements made by the HET and LET instruments on the STEREO spacecraft together with the BRYNTRN particle transport model, we compute dose rates during the event. Additionally, we use dose rates measured by the CRaTER instrument on LRO to provide dose rates near Earth. Simulations of the WSA-ENLIL+Cone model provided by the CCMC are utilized to show how the position of each observer and their magnetic connection to the shock front affect the observed radiation. We find that the results are in good qualitative agreement with expectations based on previous observations made by Reames (1999). The STEREO A/B and CRaTER dose rates used here will soon be made available to the community as a tool for studying the energetic particle radiation of solar events from different longitudes as a part of NASA's Heliophysics Virtual Observatories and on the PREDICCS and CRaTER websites.
