Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9719121f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A12, p. 19,121-19,127.
Physics
12
Bow Waves, International Sun Earth Explorer 1, International Sun Earth Explorer 2, Plasma Pressure, Satellite Observation, Solar Wind, Heat Flux, Ion Beams, Ion Temperature, Rankine-Hugoniot Relation, Specific Heat
Scientific paper
Measurements from the ISEE 1 and ISEE 2 spacecraft are used to examine the terrestrial bow shock under high beta conditions. On November 4, 1979, the large separation between the spacecraft, over 2500 km along the shock normal, was such to allow simultaneous upstream and downstream measurements of the solar wind plasma for a period of about 8 min. These measurements are compared with and found to be in agreement with the predicted values of the Rankine-Hugoniot relations using the simple adiabatic approximation and a ratio of specific heats, gamma, of 5/3. Large magnetic field and density fluctuations were observed, but average downstream plasma conditions well away from the shock were relatively steady, near the predicted Rankine-Hugoniot values. The magnetic disturbances persisted well downstream and a hot, dense ion beam was detected leaking from the downstream region of the shock. Both of these phenomena can be attributed to the excitation of the Alfven ion cyclotron instability.
Farris Michael Howard
Gosling Jack T.
Russell Christopher T.
Thomsen Michelle F.
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