Giant PC5 pulsations in the outer magnetosphere - A survey of HEOS-1 data

Details Giant PC5 pulsations in the outer magnetosphere - A survey of HEOS-1 data Giant PC5 pulsations in the outer magnetosphere - A survey of HEOS-1 data

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24..921h&link_type=abstract

Planetary and Space Science, vol. 24, Oct. 1976, p. 921-935. Research supported by the Science Research Council of England.

Computer Science

3

Earth Magnetosphere, Geomagnetic Pulsations, Heos Satellites, Magnetic Measurement, Propagation Modes, Ats 1, Data Processing, Magnetic Dipoles, Magnetic Field Configurations, Magnetic Signatures, Magnetopause, Plasma Pressure, Satellite-Borne Instruments

Scientific paper

Magnetic-field measurements from 133 low-latitude transits of the HEOS-1 satellite through the magnetosphere have been used to analyze low-frequency pulsation activity in the outer regions of the geomagnetic field. Providing full longitude coverage in the sunward hemisphere at geocentric distances larger than about 7.5 earth radii, this survey complements previous low-frequency pulsation data from satellites at smaller geocentric distances. Several giant PC5 events, each being mainly compressional and lasting 1-2 hr, are described in detail. It is shown that this phenomenon is relatively common in the geocentric distance range from 8 to 12 earth radii near dusk. A depression of the ambient field magnitude always accompanied the events, suggesting that they are associated with a region of enhanced plasma pressure. The properties of these wave events are compared with the predictions of current micropulsation theories involving a Kelvin-Helmholtz generation mechanism and field-line resonance. Unlike the PC5 events observed nearer earth, these events were not obviously related to periods of enhanced geomagnetic activity.

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