Stream interfaces and energetic ions II: ULYSSES test of Pioneer results

Details Stream interfaces and energetic ions II: ULYSSES test of Pioneer results Stream interfaces and energetic ions II: ULYSSES test of Pioneer results

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1173i&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 10, p. 1173-1176

Physics

10

Interfaces, Ion Density (Concentration), Rotating Plasmas, Shock Fronts, Solar Flux, Solar Magnetic Field, Solar Wind, Streams, Data Correlation, Entropy, Ion Temperature, Particle Motion, Pioneer Project, Ulysses Mission

Scientific paper

Ulysses measurements of energetic and solar wind particles taken near 5 AU between 20 and 30 degrees south latitude during a well-developed recurring corotating interaction region (CIR) show that the CIR's corotating energetic ion population (CEIP) associated with the trailing reverse shock starts within the CIR at the stream interface. This is consistent with an earlier result obtained by Pioneers 10 and 11 in the ecliptic plane between 4 and 6 AU. The Ulysses/Pioneer finding is noteworthy since the stream interface is not magnetically connected to the reverse shock, but lies 12-17 corotation hours from it. Thus, the finding seems to be inconsistent with the basic model that generates CEIP particles at the reverse shock and propagates them along field lines. Eliminating the inconsistency probably entails an extension of the standard model such as cross-field diffusion or a non-shock energization process operating near the stream interface closer to the sun.

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