Geomagnetic storms in the Antarctic F-region. I - Diurnal and seasonal patterns for main phase effects

Details Geomagnetic storms in the Antarctic F-region. I - Diurnal and seasonal patterns for main phase effects Geomagnetic storms in the Antarctic F-region. I - Diurnal and seasonal patterns for main phase effects

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49..901w&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Sept. 1987, p. 901-913.

Physics

42

F Region, Geomagnetism, Ionospheric Disturbances, Magnetic Storms, Annual Variations, Antarctic Regions, Diurnal Variations, Temporal Distribution

Scientific paper

New analysis procedures are used to show that the main phase midlatitude storm effects conform to consistent patterns in local time when suitable selection rules are applied, with averaging over several years. Changes in foF2, with respect to estimated quiet-time values, are analyzed in terms of ap(tau), a new geomagnetic index derived to take account of integrated disturbance. Reduction of foF2 is greatest during the early morning hours, in summer, at higher geomagnetic latitudes, near solar minimum and through the more active periods. The various dependencies are quantitatively determined for the first time by creating an average 'steady state' disturbance, rather than following specific storm events. This approach will permit tests of competing theories using available modeling programs.

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