Original Research

Electron precipitation into the upper atmosphere at Sanae

P. H. Stoker
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie | Vol 14, No 3 | a613 | DOI: https://doi.org/10.4102/satnt.v14i3.613 | © 1995 P. H. Stoker | This work is licensed under CC Attribution 4.0
Submitted: 10 July 1995 | Published: 10 July 1995

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P. H. Stoker,, South Africa

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Auroral light emissions are due to collisional processes of electrons with atmospheric constituents and occur primarily above 100 km in the ionospheric E- and F-layers, according to studies on excitation of emission lines. The absorption of about ten metre wavelength cosmic radio noise energy, as observed by riometers, occurs mainly below 90 km due to an increase of electron concentration in the ionospheric D-layer. Because auroral luminosity and auroral absorption are produced mainly by electrons in different energy regions, simultaneous observations will provide information on the energy spectrum of the incident electrons and on spectral changes of these precipitating electrons during auroral events.


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