Evolution of energetic electron fluxes at a geostationary orbit during solar cycles 22 and 23. 27-day variations |
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Authors: | V I Degtyarev S E Chudnenko |
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Institution: | 1.Institute of Solar-Terrestrial Physics, Siberian Branch,Russia Academy of Sciences,Irkutsk,Russia |
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Abstract: | In this paper, we consider variations in energetic electron fluxes at a geostationary orbit, which are related to the Sun’s
rotation period, during two solar cycles. We use data on energetic electron fluxes obtained from the GOES (1986–2007) (>2
MeV) and LANL (1996–2007) (50–225 and 315–1500 keV) satellites. Within the solar cycle, we observed both periods of high flux
peak recurrence during several rotations and periods when there was no (or a low) 27-day recurrence. We show the similarity
and difference between manifestations of flux recurrences from cycle to cycle. Insignificant manifestation of recurrence and
its absence were observed mainly during the solar maximum. High electron flux recurrence was observed mainly at the phase
of decline in solar activity (near the solar minimum). We show that for both solar cycles, there were several days (within
the Bartels rotation) during which increased energetic electron fluxes would be most likely observed. |
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