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Modulation of Jovian electrons at 1 AU during solar cycles 22-23

Kanekal, S. G. and Baker, D. N. and Blake, J. B. and Looper, M. D. and Mewaldt, R. A. (2003) Modulation of Jovian electrons at 1 AU during solar cycles 22-23. Geophysical Research Letters, 30 (15). pp. 1795-1798. ISSN 0094-8276. doi:10.1029/2003GL017502.

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We report here, on the observation of Jovian electrons during the time period 1992 to 2002, using instruments on board SAMPEX and IMP8 at 1 AU. The Jovian electron flux diminished greatly from early 1996 to the end of 1997 and recovered subsequently and was observed till the end of 2001. The decrease in the Jovian flux was seen in three distinct instruments lasting for about two Jovian synodic periods. Such a dramatic and persistent decrease has not been observed before. The observed decrease could be due to changes at the source or variations in interplanetary conditions affecting transport of these particles. The latter may be solar cycle dependent as in the heliospheric modulation of cosmic rays. Long-term measurements from IMP8 suggest that solar cycle related propagation effects may not be responsible for the observed decrease. We suggest that either a change in the Jovian source strength or a softening of the Jovian electron energy spectrum produced the observed attenuation.

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Mewaldt, R. A.0000-0003-2178-9111
Additional Information:Copyright 2003 by the American Geophysical Union. This work was supported by NASA data analysis funding for the SAMPEX program. The authors thank F. B. McDonald and R. McGuire for providing the GCRE data. The CLIMAX Neutron monitor data server is supported by National Science Foundation, Grant ATM-9912341.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2003-51
Issue or Number:15
Record Number:CaltechAUTHORS:20150319-115106791
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55932
Deposited By: Deborah Miles
Deposited On:20 Mar 2015 02:24
Last Modified:10 Nov 2021 20:52

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