Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....4694g&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #4694
Physics
Scientific paper
We combined solar wind observations from five different spacecraft: Helios 1, Helios 2, IMP-8, Voyager 1 and Voyager 2, from November 1977 to February 1978, to study the propagation of interplanetary shocks and ejecta. Based on similar patterns of solar wind bulk speeds detected by the five spacecraft, we were able to locate the same shocks in the all spacecraft data. We identified 12 shock events of different origin: 7 transient forward shocks (TFSs) and 5 corotating interaction regions (CIRs). Although all the CIR events were detected by the five spacecraft, only two of the TFSs were detected by the five spacecraft. All the shock fronts had different local strengths at different positions without any clear correlation with distance nor with longitude. For some TFSs, two spacecraft closely located, detected the same transient shock at significantly different times, indicating that the form of the TFS had strong local irregularities. In one event, the front of the TFS disappeared! locally. The results show that interplanetary shocks are locally modified as they propagate through an inhomogeneous ambient solar wind.
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