Recurring increases in energetic particle intensity during the decline of solar activity cycle 21.

Details Recurring increases in energetic particle intensity during the decline of solar activity cycle 21. Recurring increases in energetic particle intensity during the decline of solar activity cycle 21.

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992cosre..30..296l&link_type=abstract

Cosmic Res., Vol. 30, No. 3, p. 296 - 304

Computer Science

Scientific paper

Recurrent increases in energetic particle intensity recorded aboard the spacecraft Vega-1 and Vega-2 in the first half of 1985 are shown to be a portion of a lengthy series of events during the decreasing phase of solar activity cycle 21. Data from the IMP-8 spacecraft on intensity of protons with energies of 1 - 2 MeV show that this series consists of 26 increases. The events are characterized by a relatively high stability of the phase of the maximum (19±0.5 days of the Bartels solar rotation period) and a dependence of the maximum intensity upon solar wind velocity. The flux of protons and ions with energies of 0.04 - 1.0 MeV reaches a maximum several hours before the flux of particles with energies >1 MeV. The energy spectrum of protons >1 MeV does not change over the course of the event, while for protons with energy <1 MeV the spectrum becomes harder (Δγ ≍ 1) after the intensity maximum is reached. A comparison is made with events in a shock wave. The last 10 increases of the series are related to a coronal hole on the Sun.

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