Umfang:
IV, 33 S. : graph. Darst.
ISBN:
0642137358
Serie:
ANARE research notes 61
Inhalt:
The variations of 30 MHz riometer signals at the high latitude stations of Davis (geographic coordinates 68.6°S, 78.0°E ; invariant latitude 74.5°S) and Casey (geographic coordinates 66.2°S, 110.4°E; invariant latitude 80.6°S) are investigated. The general variation in ionospheric absorption at these stations is investigated for normal conditions and specifically for some disturbed periods. The quiet day diurnal variation of the riometer signal at both stations has a quasi-sinusoidal shape. At both stations, the quiet day signal is larger in winter than in summer. Some absorption events at both stations are closely related to auroral substorms. However the Davis events generally commence at an earlier magnetic local time, last longer and have a larger maximum absorption amplitude than the associated Casey events. Both stations show an increase in average absorption around local magnetic noon. This may be an absorption signature of the passage of the magnetospheric cusp over these high latitude stations. These magnetic midday events were generally of lower absorption amplitude than the events observed around magnetic midnight.
Anmerkung:
MAB0014.001: ZSP-124-61
,
Alte Signatur: A0 5746/61
In:
ANARE research notes
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