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GEOPHYSICAL RESEARCH LETTERS, VOL. 22, NO. 23, PAGES 3373–3376, 1995

The Propagation of Sub-MeV Solar Electrons to Heliolatitudes above 50°S

M. Pick

DASOP, URA CNRS 1756, Observatoire de Paris-Meudon, Meudon, 92195, France.


L. J. Lanzerotti

AT&T Bell Laboratories, Murray Hill, NJ, USA.


A. Buttighoffer

DASOP, URA CNRS 1756, Observatoire de Paris-Meudon, Meudon, 92195, France.


E. T. Sarris

University of Thrace, Xanthi, Greece.


T. P. Armstrong

Department of Physics, University of Kansas, Lawrence, USA.


G. M. Simnett

Department of Physics and Space Research, University of Birminghan, UK.


E. C. Roelof

John Hopkins University/Applied Physics Laboratory, Laurel, MD 20773, USA.


A. Kerdraon

DASOP, URA CNRS 1756, Observatoire de Paris-Meudon, Meudon, 92195, France.


Abstract

On 27 February 1994 when the Ulysses spacecraft was at an heliolatitude of 54°S low energy electrons (∼50-400 keV) and high energy protons (14-31 MeV) were measured following a solar flare beyond the west limb. These measurements show that under favorable conditions energetic particles can be transported very rapidly across 60 degrees in heliocentric latitudes to radial distances beyond 35 AU. The interplanetary transport occurs inside a structure that was identified as a CME in interplanetary space by Gosling et al. [1994] and that was produced on 20 February. The flare associated with the interplanetary electron event was well documented by the Nancay radio heliograph and was located at 09°N 95°W in the same active region that can be associated with the earlier origin of the Gosling et al. event. This particle event presents many similarities with the June ’93 interplanetary particle event observed at 32°S [Armstrong et al., 1994].

Received 17 April 1995; accepted 3 November 1995.

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Citation: Pick, M., L. J. Lanzerotti, A. Buttighoffer, E. T. Sarris, T. P. Armstrong, G. M. Simnett, E. C. Roelof, and A. Kerdraon (1995), The Propagation of Sub-MeV Solar Electrons to Heliolatitudes above 50°S, Geophys. Res. Lett., 22(23), 3373–3376.