Long term behavior of trapped relativistic electrons and their correlation with solar wind speed

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We examine Los Alamos energetic electron data from 1979 through the present to show long term trends in the trapped relativistic electron populations at geosynchronous Earth orbit. Such populations are thought to be associated with high-speed solar wind structures typically present near solar minimum. We will show that high-energy electron fluxes, E > 1.4 MeV, displayed a solar-like cycle of about 10.5 years, but that the behavior is out of phase with the sunspot cycle. We will also compare relativistic electrons during the cycle with solar wind speed from the MIT plasma analyzers on IMP-8. It will be shown that ... continued below

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9 p.

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Belian, R. D.; Cayton, T. E.; Christensen, R. A.; Ingraham, J. C. & Reeves, G. D. December 1995.

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Description

We examine Los Alamos energetic electron data from 1979 through the present to show long term trends in the trapped relativistic electron populations at geosynchronous Earth orbit. Such populations are thought to be associated with high-speed solar wind structures typically present near solar minimum. We will show that high-energy electron fluxes, E > 1.4 MeV, displayed a solar-like cycle of about 10.5 years, but that the behavior is out of phase with the sunspot cycle. We will also compare relativistic electrons during the cycle with solar wind speed from the MIT plasma analyzers on IMP-8. It will be shown that relativistic electrons correlate well with high solar winds only during limited, short periods of time. We will also confirm the observation that the higher-energy electrons occur with a longer delay after the establishment of the high-speed solar wind. Comparison of our data with previously published data indicate that the higher the solar wind speed, the sooner the relativistic electrons occur.

Physical Description

9 p.

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OSTI as DE96006057

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  • 16. solar drivers of interplanetary and terrestrial disturbances, Sunspot, NM (United States), 16-20 Oct 1995

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  • Other: DE96006057
  • Report No.: LA-UR--95-4133
  • Report No.: CONF-9510247--2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 196562
  • Archival Resource Key: ark:/67531/metadc671560

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  • December 1995

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 25, 2016, 8:21 p.m.

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Belian, R. D.; Cayton, T. E.; Christensen, R. A.; Ingraham, J. C. & Reeves, G. D. Long term behavior of trapped relativistic electrons and their correlation with solar wind speed, article, December 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc671560/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.