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GEOPHYSICAL RESEARCH LETTERS, VOL. 19, NO. 12, PAGES 1243–1246, 1992

LOW-ENERGY SOLAR ELECTRONS AND IONS OBSERVED AT ULYSSES FEBRUARY-APRIL, 1991: THE INNER HELIOSPHERE AS A PARTICLE RESERVOIR

E. C. Roelof


R. E. Gold


G. M. Simnett


S. J. Tappin


T. P. Armstrong


L. J. Lanzerotti


Abstract

Ulysses observations at 2.5 AU of 38–315 keV electrons and 61–4752 keV ions during February-April 1991 suggest in several ways that, during periods of sustained high solar activity, the inner heliosphere serves as a “reservoir” for low-energy solar particles. Particle increases were not associated one-to-one with large X-ray flares because of their poor magnetic connection, yet intensities in March-April remained well above their February levels. The rise phase of the particle event associated with the great flare of 2245UT March 22 lasted most of two days, while throughout the one-week decay phase, the lowest-energy ion fluxes were nearly equal at Ulysses and Earth (IMP-8).

Received 14 February 1992; accepted 28 May 1992.

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Citation: Roelof, E. C., R. E. Gold, G. M. Simnett, S. J. Tappin, T. P. Armstrong, and L. J. Lanzerotti (1992), LOW-ENERGY SOLAR ELECTRONS AND IONS OBSERVED AT ULYSSES FEBRUARY-APRIL, 1991: THE INNER HELIOSPHERE AS A PARTICLE RESERVOIR, Geophys. Res. Lett., 19(12), 1243–1246.