von Rosenvinge, T. T. and Richardson, I. G. and Cane, H. V. and Christian, E. R. and Cohen, C. M. S. and Cummings, A. C. and Labrador, A. W. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and Wiedenbeck, M. E. (2015) The Longitudinal Distribution of Solar Energetic Particles. In: 34th International Cosmic Ray Conference (ICRC2015). Proceedings of Science. No.236. SISSA , Trieste, Italy, Art. No. 104. https://resolver.caltech.edu/CaltechAUTHORS:20180828-122925629
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Abstract
Using observations from the High Energy Telescopes (HETs) on STEREO A and B and similar observations from SoHO, near-Earth, we have identified ~250 individual solar energetic particle events that include >14 MeV protons since the beginning of the STEREO mission [1]. Between the end of December 2009, when the STEREO A and B spacecraft were, respectively, ahead and behind Earth by ~ 65° in ecliptic longitude, and the end of December 2013, 43 different events were clearly detected at all three locations. The observed intensities of such an event are usually assumed to be Gaussian distributed as a function of the longitudes of the Parker Spiral footpoints at the Sun for each observer. This neglects the fact that the interplanetary magnetic field may have large deviations from Parker Spirals, e.g. due to coronal mass ejections from prior events. Nonetheless, we have fit Gaussians to the peak intensities observed simultaneously at three spacecraft for all 43 events. The Gaussian peak intensity is poorly correlated with the corresponding CME speed and the FWHM is uncorrelated with the CME speed. Surprisingly, however, there appear to be distinctly non-random variations of the FWHM values from event to event.
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Additional Information: | Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-ShareAlike. | ||||||||||||||||||||
Group: | Space Radiation Laboratory | ||||||||||||||||||||
Series Name: | Proceedings of Science | ||||||||||||||||||||
Issue or Number: | 236 | ||||||||||||||||||||
Record Number: | CaltechAUTHORS:20180828-122925629 | ||||||||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20180828-122925629 | ||||||||||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||
ID Code: | 89240 | ||||||||||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||||||||||
Deposited By: | George Porter | ||||||||||||||||||||
Deposited On: | 30 Aug 2018 21:21 | ||||||||||||||||||||
Last Modified: | 09 Mar 2020 13:19 |
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