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Paleoproterozoic tectonics in the Terre Adxe9;lie Craton (East Antarctica)
Several conclusions were found: (a) the occurrence, duration and intensity of blackouts in Terre Adxe9;lie correlates rather poorly with local magnetic character figures as deduced from the station magnetograms; (b) observed blackouts correlate much better with planetary magnetic character figures, Kp or Ap; (c) good correlation exists with cosmic ray intensity fluctuations both the total component (recorded at Limeil-Brevannes) or the nucleonic component (recorded at Pic du Midi and Kerguelen). Antarctic blackouts in most cases coincide with the main, negative, phase of cosmic ray storms.
It was also found that a definite relationship exists between the few proton events which we investigated and the most intense blackouts; the proton events occurred prior to the blackouts. An excellent correlation was noted between the blackouts found at Terre Adxe9;lie and those observed at Little America, Thule, Barrow, Churchill, Ottawa, etc. Thus, with the exception of partial absorption of small duration, polar blackouts seem to be global polar phenomena being particularly intense in the auroral zones.
Suggestions are made regarding the probable mechanism responsible for producing the polar high absorption periods and their precursors.
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Paleoproterozoic tectonics in the Terre Adxe9;lie Craton (East Antarctica)