Physics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ssrv...72..327s&link_type=abstract
Space Science Reviews, Volume 72, Issue 1-2, pp. 327-330
Physics
24
Heliosphere, Energetic Particles, Co-Rotating Interaction Regions
Scientific paper
The characteristics of the recurrent electron (38 53 keV) and ion (>˜0.5 MeV) enhancements observed by Ulysses from mid-1992 to April 1994 are presented. The magnitude of the ion flux increases reached a maximum at a latitude of ˜20°S and decreased afterwards by ˜23%/degree until early 1994. The magnitude of the electron increases showed a similar trend until May, 1993, after which time it became approximately constant, until it started to increase again in early 1994. The electron enhancements have lagged the protons by up to 5 days once Ulysses left the heliospheric current sheet (mid-1993). The electron spectral index tended to harden (a) during the decay of the event and (b) as the latitude increased, up to 50°S. The events have recurred on a 26.0 day period, but with significant phase shifts over the 25 rotations studied. The H/He ratio decreases across the maximum intensity. The mean minimum value for H/He was 3.5±0.3, lower than that measured in previous studies in the ecliptic plane.
Roelof Edmond C.
Sayle K. A.
Simnett George M.
Tappin James S.
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