Longitude structure of the ionosphere <formula>F region from TOPEX/Poseidon and ground-based data during January 20-30, 1993, including the quasi 2-day oscillation

Details Longitude structure of the ionosphere <formula>F region from TOPEX/Poseidon and ground-based data during January 20-30, 1993, including the quasi 2-day oscillation Longitude structure of the ionosphere <formula>F region from TOPEX/Poseidon and ground-based data during January 20-30, 1993, including the quasi 2-day oscillation

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.7293f&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A4, p. 7293-7300

Physics

4

Ionosphere: Equatorial Ionosphere, Ionosphere: Ionization Mechanisms, Ionosphere: Midlatitude Ionosphere, Ionosphere: Plasma Temperature And Density

Scientific paper

The global structure of the F region ionosphere during January 20-30, 1993, is examined with emphasis on longitudinal variations. The database consists of total electron content (TEC) measurements from the TOPEX/Poseidon dual-frequency altimeter experiment from -66° to +66° geographic latitude for prenoon and premidnight conditions, and hourly f0F2 and hmF2 values from eight ionosonde stations between -42° and +26° geographic latitude in the Pacific sector. The 10-day averaged daytime TEC data reveal latitude versus longitude structures whose salient features are captured (within ~10TEC units) by the 1990 International Reference Ionosphere (IRI-90), and which can be explained by dynamically induced neutral composition changes due to a combination of solar and magnetically driven circulation systems. The premidnight TEC data at low latitudes reveal the double-banded structure of the equatorial ionization anomaly with, however, pronounced variations in amplitude and position as a function of geomagnetic longitude. None of these features, which probably reflect some combination of electric field and neutral wind effects, are captured by IRI-90. Time series analyses of the f0F2 and hmF2 data, and space-time Fourier spectra of the TEC data, reveal the presence of a quasi 2-day (QTD) oscillation in the ionosphere which is associated with QTD wind and temperature oscillations in the mesosphere and lower thermosphere previously documented for this time period. The satellite-based QTD results are subject to significant caveats described herein. Nevertheless, the TOPEX/Poseidon TEC data set clearly represents an important resource for global studies of ionospheric structure and plasma-neutral interactions.

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