Ion composition in sporadic E layers measured by the EISCAT UHF radar

Details Ion composition in sporadic E layers measured by the EISCAT UHF radar Ion composition in sporadic E layers measured by the EISCAT UHF radar

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9314603h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Dec. 1, 1988, p. 14603-14610.

Other

19

Atmospheric Models, Eiscat Radar System (Europe), Plasma Density, Sporadic E Layer, Atmospheric Composition, Atmospheric Stratification, Electron Density (Concentration), Least Squares Method, Ultrahigh Frequencies

Scientific paper

The paper presents ion composition results for several sporadic E layers observed during a Norwegian special program carried out by the European Incoherent Scatter Facility (EISCAT) UHF radar in August 1984. A range resolution of 600 m was used. Eight sporadic E layers at altitudes 95-114 km were studied using various fitting strategies for obtaining the ion composition. A fixed temperature was assumed in some of the strategies; in others the temperature was fitted together with the composition. Heavy ions, most probably Fe(+), were found to be present in most layers with relative abundances of 30-80 percent. In one case, the composition analysis shows that essentially no heavy ions are present. This layer is supposed to be composed of light metal ions, such as Mg(+). In one particular event a layer is seen to separate into two sheets with a height difference of 2-3 km, and the ion compositions in the two parts are found to be different. Possible explanations of this phenomenon are discussed.

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