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Large Proton Anisotropies in the 18 August 2010 Solar Particle EventThe solar particle event observed at STEREO Ahead on 18 August 2010 displayeda rich variety of behavior in the particle anisotropies. Sectored rates measured by theLow Energy Telescope (LET) on STEREO showed very large bidirectional anisotropies in4 6 MeV protons for the first 17 hours of the event while inside a magnetic cloud, withintensities along the field direction several hundred to nearly 1000 times greater than thoseperpendicular to the field. At the trailing end of the cloud, the protons became isotropic andtheir spectrum hardened slightly, while the HeH abundance ratio plunged by a factor of approximatelyfour for about four hours. Associated with the arrival of a shock on 20 Augustwas a series of brief (10 minute duration) intensity increases (commonly called shockspikes) with relatively narrow angular distributions (45 FWHM), followed by an abruptdecrease in particle intensities at the shock itself and a reversal of the proton flow to a directiontoward the Sun and away from the receding shock. We discuss the STEREOLETobservations of this interesting event in the context of other observations reported in theliterature
Document ID
20140005255
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1007/s11207-012-0018-5
Authors
Leske, R. A. (California Inst. of Tech. Pasadena, CA, United States)
Cohen, C. M. S. (California Inst. of Tech. Pasadena, CA, United States)
Mewaldt, R. A. (California Inst. of Tech. Pasadena, CA, United States)
Christian, Eric R. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Cummings, A. C. (California Inst. of Tech. Pasadena, CA, United States)
Labrador, A. W. (California Inst. of Tech. Pasadena, CA, United States)
Stone, E. C. (California Inst. of Tech. Pasadena, CA, United States)
Wiedenbeck, Mark E. (California Inst. of Tech. Pasadena, CA, United States)
Rosenvinge, Tycho T Von (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
May 8, 2014
Publication Date
November 1, 2012
Publication Information
Publication: Solar Physics
Volume: 281
Issue: 1
Subject Category
Solar Physics
Report/Patent Number
GSFC-E-DAA-TN8469
Funding Number(s)
CONTRACT_GRANT: NAS5-00132
CONTRACT_GRANT: NAS5-03131
CONTRACT_GRANT: NNX08AK87G
CONTRACT_GRANT: SA2715-26309
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
cosmic rays solar
interplanetary
energetic particles

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