Pulsations in magnetic field and ion flux observed at L = 4.5 on August 5, 1972

Details Pulsations in magnetic field and ion flux observed at L = 4.5 on August 5, 1972 Pulsations in magnetic field and ion flux observed at L = 4.5 on August 5, 1972

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..161e&link_type=abstract

Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 161-173.

Physics

5

Geomagnetic Pulsations, Magnetic Storms, Solar Terrestrial Interactions, Explorer 45 Satellite, Extremely Low Radio Frequencies, Geomagnetism, Particle Flux Density, Solar Activity Effects

Scientific paper

Observations made from space (Explorer 45) near L = 4.5 and from magnetic observatories on the ground of the large-amplitude ULF pulsations that followed the unusually strong compression of the earth's magnetosphere associated with the geomagnetic storm of August 1972 are analyzed. A spectral analysis of Explorer 45 magnetometer data indicates a compressional mode oscillation coupled to a transverse mode oscillation. Enhancements in amplitude of a 300-s period wave near 0040 UT August 5 are found to coincide with an intensification of 100- to 1000-Hz magnetic and electric field oscillations and with the appearance of fluxes of energetic ions. It is noted that during this period the ion pitch angle distribution in each available energy channel (24-300 keV) followed a periodic sequence, apparently synchronized with the magnetic pulsations, from normal trapping (highest fluxes near 90 deg and lowest near 0 deg and 180 deg) to a nearly isotropic particle distribution. It is found that during the transitions the particle flux near 90 deg pitch angle was alternately large earthward of the satellite (before isotropy) and larger radially outward from the satellite (after isotropy).

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