Satellite bremsstrahlung X ray measurements at the onset of a magnetospheric substorm

Details Satellite bremsstrahlung X ray measurements at the onset of a magnetospheric substorm Satellite bremsstrahlung X ray measurements at the onset of a magnetospheric substorm

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.8149i&link_type=abstract

Journal of Geophysical Research, vol. 87, Oct. 1, 1982, p. 8149-8156. Research sponsored by the Lockheed Independent Research P

Physics

7

Bremsstrahlung, Electron Precipitation, High Energy Electrons, Magnetic Storms, Magnetospheric Electron Density, X Ray Density Measurement, Electron Density (Concentration), Electron Energy, Electron Spectroscopy, Satellite Observation, Trapped Particles

Scientific paper

Bremsstrahlung X-ray (more than 21 keV) mappings and direct electron (more than 68 keV) measurements from the low-altitude polar-orbiting satellite P78-1 performed at critical times and locations near the onset of a magnetospheric substorm on July 3, 1979, at about 2149 UT are discussed. It is noted that the bremsstrahlung X-ray intensities emitted from the atmosphere over a wide range of longitudes and L shells were negligible just before the substorm onset, then rose to a maximum within about a minute or less, and remained at an enhanced level for the next 9 minutes. The simultaneous X-ray measurements from the SBARMO-79 balloons and the P78-1 satellite suggest that the electron precipitation started at L = 5-5.5 without a significant precipitation from higher L shells. What is more, the satellite data revealed a relatively sharp longitude decrease in electron precipitation at positions east of approximately 30 deg E or at magnetic local times after about 1.5 hours.

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