Downward mapping of quasi-static ionospheric electric fields at low latitudes during fair weather

Details Downward mapping of quasi-static ionospheric electric fields at low latitudes during fair weather Downward mapping of quasi-static ionospheric electric fields at low latitudes during fair weather

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..223d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Mar.-Apr. 1992, p. 223-230.

Computer Science

Sound

Atmospheric Electricity, Electric Fields, Finite Element Method, Ionospheric Currents, Tropical Regions, Atmospheric Conductivity, Atmospheric Models, Balloon Sounding, Electron Precipitation

Scientific paper

The problem of downward mapping of equatorial ionospheric electric fields is studied in two dimensions employing the finite elements and finite differences numerical techniques. The solutions obtained for low latitudes are compared with known results for high latitudes. It is found that equatorial ionospheric electric fields of scale lengths of the order of 100 km or more reach balloon heights (30-40 km) without undergoing noticeable attenuation. However, in the case of equatorial ionospheric electric fields of scale lengths of a few tens of kilometers it is found that these fields reach balloon heights with severe attenuation. The corresponding attenuation factors are significantly larger that those known for high latitudes. It is also shown that the presence of mountains with a fairly large height as well as of a large-scale conductivity irregularity in the middle atmosphere, such as that expected in the South Atlantic Magnetic Anomaly region during energetic electron precipitation events, can considerably distort the mapped ionospheric electric fields at the middle atmosphere.

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