Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81..199d&link_type=abstract
Journal of Geophysical Research, vol. 81, Jan. 1, 1976, p. 199-204. Research supported by the Consiglio Nazionale delle Ricerch
Physics
4
Bow Waves, Heos Satellites, Interplanetary Magnetic Fields, Solar Protons, Solar Wind Velocity, Data Reduction, Geomagnetism, Plasma Diagnostics, Reflected Waves, Shock Fronts, Statistical Analysis
Scientific paper
The location of the forward boundary of the upstream wave region ahead of the earth's bow shock is investigated statistically using plasma and magnetic-field data obtained by Heos 1. The analysis is conducted on the assumption that the waves are produced by protons reflected from the bow shock and traveling upstream with an effective velocity equal to the product of a parameter, p, and the solar-wind bulk velocity. The data-reduction methods are summarized, and uncertainties in the determination of the value of p are discussed. It is found that the overall average boundary corresponds to a velocity of approximately twice the solar-wind velocity for protons reflected from the daytime sector of the bow shock. More refined analysis of the data shows that the value of p is approximately 1.6 near the subsolar point and greater than 2 along the daytime flanks of the bow shock.
Diodato L.
Formisano Vittorio
Greenstadt Eugene W.
Moreno Giovani
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