The Sporadic E and Descending Layers in the Equatorial Anomaly Region

Details The Sporadic E and Descending Layers in the Equatorial Anomaly Region The Sporadic E and Descending Layers in the Equatorial Anomaly Region

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa32a0673c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA32A-0673

Computer Science

Sound

2439 Ionospheric Irregularities

Scientific paper

The sporadic E (Es) and descending layers are irregular layers occurring in the lower ionosphere (lower than 200 km). The sporadic E layer usually takes place at the heights of 105-110 km, while the descending layer appears in the ranges of 100-200 km. Unlike the stable Chapman-like models of E, F1, and F2 layers, these two layers are highly variable in time and space. To study the occurrences of these layers in the equatorial anomaly region, the ionograms obtained by a digisonde portable sounder (DPS) at National Central University (NCU, 25 deg. N, 121 deg. E) during 1996 have been categorized and examined. In this paper, variations of the Es and descending layers with respect to different time, seasons, solar radiations, and geomagnetic conditions will be presented and discussed.

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