Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81...60l&link_type=abstract
Journal of Geophysical Research, vol. 81, Jan. 1, 1976, p. 60-64.
Physics
6
Interplanetary Magnetic Fields, Satellite Observation, Shock Wave Interaction, Solar Activity Effects, Solar Wind, Surface Geometry, Explorer 33 Satellite, Least Squares Method, Pioneer Space Probes, Plasma Probes, Shock Fronts, Shock Wave Propagation, Solar Flares
Scientific paper
An estimated shape is presented for the surface of the flare-associated interplanetary shock of February 15-16, 1967, as seen in the ecliptic-plane cross section. The estimate is based on observations by Explorer 33 and Pioneers 6 and 7. The estimated shock normal at the Explorer 33 position is obtained by a least-squares shock parameter-fitting procedure for that satellite's data; the shock normal at the Pioneer 7 position is found by using the magnetic coplanarity theorem and magnetic-field data. The average shock speed from the sun to each spacecraft is determined along with the local speed at Explorer 33 and the relations between these speeds and the position of the initiating solar flare. The Explorer 33 shock normal is found to be severely inclined and not typical of interplanetary shocks. It is shown that the curvature of the shock surface in the ecliptic plane near the earth-Pioneer 7 region is consistent with a radius of not more than 0.4 AU.
Chao Jerry K.
Lepping Ronald P.
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