Midlatitude Topside Spreading Observed by the ISS-B Satellite

Details Midlatitude Topside Spreading Observed by the ISS-B Satellite Midlatitude Topside Spreading Observed by the ISS-B Satellite

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa42a..05e&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA42A-05

Computer Science

Sound

2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere, 2467 Plasma Temperature And Density

Scientific paper

The ISS-B satelllite carried a topside sounder that provided global coverage of the midlatitude ionosphere. Using these data in conjunction with an automated signal processing scheme developed by Maruyama and Matuura (JGR, 89, 10,903, 1984) we present results of the first systematic global study of nighttime topside spreading events that focuses specifically on geomagnetic midlatitudes. The data show very strong seasonal variations in specific latitude ranges, most notably the north Atlantic, Asian, and south Atlantic regions. Most of the events are small in scale, but about 20 events cover geographic areas up to 1000 km in horizontal extent. Epoch analysis for the large-scale events in the November-January period reveals correlations with minima in the AE index 6-8 hours prior to the onset of the disturbances that produce the echoes. Considering both large and small events, peaks in the occurrence probability are found in regions where the dusk terminator is most closely aligned with the geomagnetic field. These findings indicate that electric fields mapping along the geomagnetic field are important to the destabilization of the topside, and also suggest that the largest such events may not be associated with TIDs generated at high latitudes. We compare these and other empirical findings with current theories of midlatitude spread F.

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