Particle acceleration at corotating reverse shocks in the southern hemisphere: Ulysses results

Details Particle acceleration at corotating reverse shocks in the southern hemisphere: Ulysses results Particle acceleration at corotating reverse shocks in the southern hemisphere: Ulysses results

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1155d&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 9, p. 1155-1158

Physics

5

Interplanetary Physics: Corotating Streams, Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Solar Cycle Variations

Scientific paper

We have correlated the ~1MeV proton intensity (J) measured at corotating reverse shocks detected by Ulysses in the southern hemisphere with two parameters that characterise the strength of the shock. Between 6°-29°S J is essentially independent of the shock strength, whereas between 29°-41°S J is well correlated with the same. The poor correlation from 6°S to 29°S is attributed to variations in the background intensity caused by changes in solar activity. Our results also show that J is independent of the shock normal angle at all latitudes. We compensate for the effects of a fluctuating background by assuming that reverse shocks associated with two adjacent compression regions observed during a ~26 day period accelerate particles out of the same seed population. The relation between the ratio of the proton intensities and the ratios of the shock parameters for such reverse shock-pairs indicates that the shock acceleration efficiency increases with the shock strength but is independent of the normal angle.

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