Five-Spacecraft Observations of Solar Wind Structure and Interplanetary Shocks Approaching Solar Maximum

Details Five-Spacecraft Observations of Solar Wind Structure and Interplanetary Shocks Approaching Solar Maximum Five-Spacecraft Observations of Solar Wind Structure and Interplanetary Shocks Approaching Solar Maximum

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh62a07g&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH62A-07

Physics

2100 Interplanetary Physics, 2111 Ejecta, Driver Gases, And Magnetic Clouds, 2139 Interplanetary Shocks

Scientific paper

We combined solar wind observations from five different spacecraft: Helios 1, Helios 2, OMNI tape, Voyager 1, and Voyager 2, from November 1977 to February 1978, to study the structure of the solar wind streams and the propagation of interplanetary shocks and ejecta. We identified 12 shock events of different origin: 7 transient forward shocks (TFSs) and 5 corotating interaction regions (CIRs). Based on the similar patterns of solar wind bulk speeds detected by the five spacecraft, we located the shocks in the spacecraft data series. All the CIR events were detected by the five spacecraft, but only one of the TFSs was detected by the five spacecraft. Some TFSs were discontinuous. The density, temperature, and magnetic field measurements of the five spacecraft contained many structures or local inhomogeneities, indicating that the solar wind streams were very structured. We did not find any clear tendency of the strength of transient and corotating shocks with heliocentric distance nor longitudinal angle. The shock fronts had different local strengths at different positions without any apparent order. TFSs appeared propagating through faster ambient solar wind streams than the forward shocks leading the CIRs. In some events, two spacecraft closely located, detected the same transient shock with large temporal lags in their data series, indicating that the shape of the shock had many strong local irregularities. The characteristics of the ejecta signatures following the TFSs varied in the observations of the five spacecraft.

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