Dynamics of the outer radiation belts in relation to polar substorms and hot plasma injections at geostationary altitude

Details Dynamics of the outer radiation belts in relation to polar substorms and hot plasma injections at geostationary altitude Dynamics of the outer radiation belts in relation to polar substorms and hot plasma injections at geostationary altitude

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ang....37..261s&link_type=abstract

Annales de Geophysique, vol. 37, Apr.-June 1981, p. 261-269. In French. Research supported by the Centre National de la Recherc

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High Temperature Plasmas, Outer Radiation Belt, Polar Substorms, Space Plasmas, Synchronous Satellites, Auroras, Diurnal Variations, Energetic Particles, Geomagnetism, Ground Stations, Magnetospheric Instability, Satellite Sounding

Scientific paper

Geostationary satellite and ground measurements of dynamic variations of the outer radiation belts and their relations with the development of auroral structures during magnetospheric substorms are analyzed. A comparison of measurements of the H or X geomagnetic field components made by seven auroral stations with ATS-6 low-energy and high-energy particle measurements during the multiple-onset substorm of Aug. 16, 1974 is presented which demonstrates that while the decrease in energetic particle fluxed ends only at the time of a strong substorm onset, rapid motions of the outer radiation belts may occur during the flux decrease. All-sky photographs of auroral phenomena taken at Fort Yukon and College, Alaska are then compared with ATS-1 energetic particle flux measurements in order to demonstrate the relation between flux decreases and increases and distinct substorm phases. Results support the hypothesis of a magnetospheric substorm precursor which appears to be an instability growing at the inner boundary of the plasma layer and approaching the earth, and underline the importance of current and magnetic field variations in charged particle dynamics.

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