Other
Scientific paper
Oct 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967ssrv....7..198b&link_type=abstract
Space Science Reviews, Volume 7, Issue 2-3, pp. 198-210
Other
5
Scientific paper
The coupling between the ionosphere and the outer magnetosphere depends on the topology of the geomagnetic field. Some aspects of the closed and open magnetospheric models are briefly discussed. The assumption that the geomagnetic field lines are equipotentials is critisized both on observational and on theoretical grounds. Measurements of Hα Doppler profiles, of precipitating particles above the ionosphere, and of charged particle densities in the magnetosphere indicate the existence of electric fields, E\, parallel with the magnetic field. Two different models of E\ are considered. Both models violate the condition of frozen-in magnetic fields. In one of them there are occasional transient electric field impulses along the field lines which cause precipitation splashes. The other model invokes electrostatic fields which vanish occasionally due to instabilities. This gives rise to precipitation splashes of about equal numbers of ions and electrons. The latter model seems to be favoured by known satellite data concerning the pitch angle distributions of electrons above the ionosphere. It is suggested that electric fields in space should be measured by satellites and rockets. Expected values of the fields in different regions of space are given.
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