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Simnett et al. 1995
Simnett, G.M., Sayle, K.A. and Roelof, E.C. (1995). Differences between the 0.35–1.0 MeV/nucleon H/He ratio in solar and Co-rotating events at high heliolatitude. Geophysical Research Letters 22: doi: 10.1029/95GL02780. issn: 0094-8276.

We discuss measurements from the Ulysses spacecraft of the 0.35--1.0 MeV/nucleon H/He intensity ratio at high heliolatitudes. In early 1994 two transient solar events were detected in the gaps between particle intensity increases associated with the passage at low latitude of a co-rotating interaction region. The H/He ratio was > one order-of-magnitude lower in the co-rotating events than in the transient solar events. Several similar instances, but not so cleanly separated, were observed from mid-1992 to the end of 1993. We interpret the lower H/He ratio in recurrent events as the result of efficient acceleration of interstellar pick-up He+ at corotating reverse shocks to which Ulysses remains connected even at high heliolatitudes. ¿ American Geophysical Union 1995

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Abstract

Keywords
Interplanetary Physics, Interplanetary shocks
Journal
Geophysical Research Letters
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Publisher
American Geophysical Union
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