Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh21b..07g&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH21B-07
Physics
2102 Corotating Streams, 2139 Interplanetary Shocks, 2162 Solar Cycle Variations (7536)
Scientific paper
Interplanetary shocks associated with corotating interaction regions (CIRs) are a dominant feature in the solar wind in the vicinity of the solar equator over most of the solar cycle between heliocentric distances of 1 and 15 AU. These events are associated with a broad range of phenomena in the inner and outer heliosphere. The region between heliocentric distances of 1 and 5 AU is of particular interest, for this is the region where most CIRs form and the strength of their associated shocks is at a maximum. Observations from the Pioneer, Voyager, and Ulysses spacecraft provide a unique opportunity to examine the behavior and evolution of corotating shocks in this region. The Pioneer 10 and 11 spacecraft provided observations between 1 and 5 AU during the descending phase of solar cycle 20, when solar activity was low. The Voyager 1 and 2 spacecraft provided observations between 1 and 5 AU during the ascending phase and maximum of solar cycle 21, when solar activity was significantly higher. The Ulysses spacecraft provided comparable observations during the ascending phase and maximum of solar cycle 22 during the low latitude phase of its mission. Measurements of solar wind and IMF parameters from the Pioneer 10 and 11, Voyager 1 and 2, and Ulysses spacecraft were used to conduct a large-scale survey of corotating shocks at heliocentric distances between 1 and 5 AU. Comparison of observations from these five spacecraft makes it possible to resolve many of the effects of radial evolution, solar cycle variation, and differences between successive solar cycles. The results of this survey are discussed.
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