Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh41a1898z&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH41A-1898
Physics
[2102] Interplanetary Physics / Corotating Streams, [2114] Interplanetary Physics / Energetic Particles, [2139] Interplanetary Physics / Interplanetary Shocks, [2164] Interplanetary Physics / Solar Wind Plasma
Scientific paper
Corotating Interaction Region (CIR) shocks observed at Ulysses in 2003 -04 have been classified as sub- or super-critical, i.e., implying whether the shock properties involve dissipation of solar wind electrons or also ions. The CIR shocks tend to be more supercritical than ICME shocks observed near 1 AU during the same (descending) phase of the solar cycle. The reason is that the fast mode wave speed is typically greater at 1 AU than at larger distances resulting in a reduction in the ICME Mach Numbers. The comparison has been extended to CIR shocks in 1991-92 analyzed by Burton et al. (Astronomy and Astrophysics, 1996) and the more recent shocks are also more supercritical. A correlation between super-criticality, or more generally Mach Number, and the intensity of shock-accelerated energetic particles first found in 1991-92 data has been confirmed. However, the correlation of energetic particle intensity with Mach Number is poorer for the recent shocks in spite of their being more supercritical. Overall, these results suggest that the relation between the shocks and energetic particles depends on the specific solar cycle, e.g., the recent decrease in solar wind flux, as well as on phase.
Smith Edward. J.
Zhou Xiangfa
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