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A 360° Survey of Solar Energetic Particle Events and One Extreme Event

Mewaldt, R. A. and Cohen, C. M. S. and Mason, G. M. and von Rosenvinge, T. T. and Vourlidas, A. (2015) A 360° Survey of Solar Energetic Particle Events and One Extreme Event. In: 34th International Cosmic Ray Conference. Proceedings of Science. No.236. SISSA , Trieste, Italy, Art. No. 139.

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We report on a 3-point longitudinal survey of Solar Energetic Particle (SEP) events during 2010-2014 using data from the STEREO and near-Earth spacecraft. During the period from August 2010 through September 2014 a total of 77 SEP events were identified with >10 MeV proton intensities that exceeded the NOAA criterion of >10 protons/(cm^2 sr-s), including 37 events at STEREO-A and 36 each at GOES and STEREO-A. Thirty-seven percent of the events reached this threshold intensity at more than one location. Unexpected solar activity in December 2006 provided an opportunity to cross-calibrate the STEREO and GOES sensors, demonstrating that the >10 MeV response for GOES was ~5%-8% greater than for the STEREOs, while the STEREO A&B responses agreed to within 2%. The July 23, 2012 event observed by STEREO-A was found to be the most intense SEP event in more than 20 years. We present observations of the longitude distribution of SEP events and fluences and compare properties of the July 23, 2012 event with those of the largest events of earlier solar cycles.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Mewaldt, R. A.0000-0003-2178-9111
Cohen, C. M. S.0000-0002-0978-8127
Mason, G. M.0000-0003-2169-9618
Vourlidas, A.0000-0002-8164-5948
Additional Information:Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-ShareAlike. The work at Caltech was supported by NASA grants NNX13A66G and NNX11A075G, NASA contract NAS5-03131, and NSF grant 1156004. The work at APL was supported by NASA grant NNX13AR20G/115828 and contract SA4889-26309 from UC Berkeley to JHU/APL. We appreciate the availability of NOAA GOES data and NASA OMNI data.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Series Name:Proceedings of Science
Issue or Number:236
Record Number:CaltechAUTHORS:20180824-100032838
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89131
Deposited By: George Porter
Deposited On:28 Aug 2018 17:29
Last Modified:16 Nov 2021 00:32

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