The baselevel ionospheric trough

Details The baselevel ionospheric trough The baselevel ionospheric trough

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.5129m&link_type=abstract

Journal of Geophysical Research, vol. 82, Nov. 1, 1977, p. 5129-5137.

Physics

Geophysics

6

F Region, Geophysics, Ionospheric Electron Density, Night Sky, Earth Magnetosphere, Geomagnetic Latitude, Isis-B, Northern Hemisphere, Winter

Scientific paper

Electron density profiles of the topside F region are used for an examination of the ionosphere trough under the conditions of a December solstice period, midnight local time, and low geomagnetic activity. The morphological description thus obtained is called the baselevel trough. It is found that: (1) frequently the trough can be identified on latitudinal profiles of the topside electron density distribution, (2) the center of the trough is located near 60 deg CGL, and has a width of about 10 deg (2 MHz) at h(max), (3) the poleward wall of the trough is steeper than the equatorward wall, and is lower in latitude than the statistical position of the equatorward edge of the diffuse aurora, (4) increasing altitude distorts the trough, (5) the trough minimum has moderately high plasma temperatures and decreasing h(max) values, and (6) the statistically determined plasmapause, when projected to F region altitudes, is within the trough minimum and coincides with the high-latitude terminus of the transition height change.

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