Propagation of the geomagnetic density and temperature effect into the exosphere

Details Propagation of the geomagnetic density and temperature effect into the exosphere Propagation of the geomagnetic density and temperature effect into the exosphere

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27..403p&link_type=abstract

Planetary and Space Science, vol. 27, Apr. 1979, p. 403-409.

Physics

2

Atmospheric Models, Exosphere, Geomagnetism, Kinetic Theory, Magnetic Flux, Temperature Effects, Dynamic Models, Magnetic Storms, Magnetic Variations

Scientific paper

The propagation of the geomagnetic effect into the exosphere is investigated based on a free-flight particle kinetic model of exospheric densities and temperatures. Exobasic neutral gas conditions and their variations during a geomagnetic storm occurrence are adopted as given by the OGO-6 model. The contributions of particles originating at different exobasic locations to the density and temperature at exospheric regions are taken into account according to the time needed to reach these regions. A short-time geomagnetic variation of exobasic conditions is simulated by a Gaussian-shaped Ap-index variation with an FWHM of 20 min. It is then shown that the relative amplitude and the half width of the geomagnetic density variation increase strongly with exospheric heights. The density peak and the main temperature peak are shown to be delayed by more than one and two hours, respectively, at heights above 10,000 km. The temperature variation changes from a single-peaked to a double-peaked structure at greater exospheric heights. It is shown that the exospheric density response to geomagnetic disturbances is detectable in observations of the geocoronal He-I-584 A resonance radiation.

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