Pioneer 9 and OGO 5 observations of an interplanetary multiple shock ensemble on February 2, 1969

Details Pioneer 9 and OGO 5 observations of an interplanetary multiple shock ensemble on February 2, 1969 Pioneer 9 and OGO 5 observations of an interplanetary multiple shock ensemble on February 2, 1969

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.3225d&link_type=abstract

Journal of Geophysical Research, vol. 80, Aug. 1, 1975, p. 3225-3234.

Physics

1

Interplanetary Magnetic Fields, Plasma Waves, Shock Wave Propagation, Solar Wind, Interplanetary Medium, Magnetic Measurement, Magnetohydrodynamic Waves, Ogo-5, Pioneer 9 Space Probe, Plasma Diagnostics

Scientific paper

A multiple shock system was observed upstream (0.13 AU) of the earth by Pioneer 9 on February 2, 1969. The same system was observed at earth by Ogo 5 and was reported separately in the literature. This paper compares the two sets of observations in still further detail. Both magnetic-field and plasma data are used in a least-squares best-fit method to compute the characteristics of the fast forward shock wave (Pioneer 9 only) and two fast reverse shock waves. Nearly all major features (shock, piston, and tangential discontinuity) retained their characteristics during the transit of the shock ensemble from Pioneer 9 to Ogo 5. The genesis of the ensemble is believed to be due to a complex stream-stream interaction. A substantial density increase (including a large rise of alpha/proton abundance) at Ogo 5, but unobserved at Pioneer 9, is explained by a sudden meridional shift to a flow from below the ecliptic plane while the streams were en route to earth. This study demonstrates a spatial and temporal plasma inhomogeneity which is superimposed on the persistent major features.

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