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Description

The riometer records of 27.6 Mc/s cosmic noise from the Alaskan IGY stations are used to study the phenomenon of aurorally associated absorption. The emphasis of the work is on the comparison of the auroral absorption recorded at different latitudes, and the primary result is the definition of an auroral absorption zone. This zone is compared to the analogous visual auroral zone, and the geomagnetic latitude of maximum intensity of the absorption zone is found to be near College (64.65°) whereas the latitude of the peak of the visual zone is near Ft. Yukon (66.69°). The auroral absorption zone is more pronounced during magnetically disturbed periods, but daily and seasonal variations are generally the most effective secondary factors determining its character. Absorption is found to exhibit a daytime maximum at all stations, and a winter maximum in auroral absorption is observed at College. Possible interpretations of the discrepancy between the absorption and visual zones are suggested in terms of the relation of these zones to the primary auroral particles.

Publication Date

5-17-1961

Keywords

Auroras, Ionospheric radio wave absorption, Cosmic noise

Handle

http://hdl.handle.net/11122/15593

The aurorally associated ionospheric absorption of cosmic radio noise

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