A two-spacecraft study of the preshock perturbations of the solar wind protons

Details A two-spacecraft study of the preshock perturbations of the solar wind protons A two-spacecraft study of the preshock perturbations of the solar wind protons

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.3615d&link_type=abstract

Journal of Geophysical Research, vol. 82, Sept. 1, 1977, p. 3615-3622. Research supported by the Consiglio Nazionale delle Rice

Mathematics

Probability

5

Satellite Observation, Shock Waves, Solar Protons, Solar Wind, Earth Orbits, Explorer Satellites, Heos Satellites, Proton Protuberances

Scientific paper

An extended statistical analysis of solar wind perturbations occurring in the region upstream of the earth's bow shock, where low frequency waves are present, is carried out. The basic data in the study are hourly averages of plasma and magnetic field parameters collected by the Explorer 33, 34 and 35 satellites and the Heos 1 spacecraft. A two-spacecraft technique based on the comparison of simultaneous observations, performed inside and outside the upstream wave region, is used to test the results obtained by single satellites. It is concluded that the probability for an earth-orbiting satellite to lie inside the upstream wave region depends on the dynamic pressure of the solar wind. But when this effect is eliminated by considering simultaneous observations inside and outside the upstream wave region, no significant difference is observed between the unperturbed interplanetary region and the upstream wave region in terms of the basic proton parameters (density, bulk velocity and temperature).

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