Physics
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ssrv...19..703c&link_type=abstract
Space Science Reviews, vol. 19, Oct.-Nov. 1976, p. 703-711.
Physics
Interplanetary Magnetic Fields, Magnetic Storms, Magnetospheric Instability, Solar Activity Effects, Solar Flares, Solar Wind Velocity, Magnetic Signatures, Magnetopause, Magnetosheath, Proton Energy
Scientific paper
The solar-wind velocity and interplanetary magnetic field were unusually high late on August 4 and early on August 5, 1972. The magnetopause was close to or below 6.6 earth radii from 2117 to 2318 UT and close to or below 5.1 earth radii from 2236 to 2318 UT on August 4. The magnetosheath field near noon was several hundred gammas and frequently south during these intervals, and there was some evidence of field erosion. The entry of solar-wind plasma into the inner magnetosphere during this period was not unusually high, however. Proton energy density was lower than in the storms of December 1971 and June 1972. The plasmapause steadily moved inward on August 4 and 5; it reached 2 earth radii before expanding on August 6. The unusually high-amplitude magnetic pulsations commenced near 2240 UT, August 4, and lasted until near noon on August 5. Both the close magnetopause and the large pulsations appear to be due to the high solar-wind velocity following the shock that reached earth at 2054 UT on August 4.
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