Topside ionospheric trough morphology - Occurrence frequency and diurnal, seasonal, and altitude variations

Details Topside ionospheric trough morphology - Occurrence frequency and diurnal, seasonal, and altitude variations Topside ionospheric trough morphology - Occurrence frequency and diurnal, seasonal, and altitude variations

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84..489a&link_type=abstract

Journal of Geophysical Research, vol. 84, Feb. 1, 1979, p. 489-498.

Physics

4

Diurnal Variations, Ionospheric Electron Density, Ionospheric Ion Density, Satellite Observation, Annual Variations, Electrostatic Probes, Frequency Response, Injun Satellites, Isis Satellites, Plasmapause

Scientific paper

Results of a statistical investigation of 37 months of observation of the occurence frequency and diurnal, seasonal, and altitude variations of the trough, or zone of decreased electron and positive ion density, in the topside ionosphere are presented. Thermal positive ion and electron densities were measured by means of electrostatic probes aboard the Isis I and Injun 5 satellites in the 560 to 3600 km altitude range. Troughs are found to occur most frequently during the night and least frequently within three hours of noon. There is no significant seasonal variation of trough location except in the sunrise sector. At all altitudes, the nightside location of the trough is found to correspond with the reported locations of the plasmapause. On the dayside, however, the location of the troughs observed depends upon the altitude. Above 1500 km on the dayside, two independent troughs, T1 (at high latitudes, at the equatorward edge of the cusp) and T2 (at low latitudes, associated with the nighttime plasmapause) are observed. The development of T1 is attributed to the depleting effects of enhanced ion chemical reactions in the presence of convective electric fields.

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