IN the afternoon of Nov. 16, 1929, during my stay in Abisko in northern Sweden (N. lat. 68° 21′) I observed a rather intensive auroral ray of about 10° apparent length and about ½° apparent breadth in the west-south-west below a completely cloudy sky. The exact time of the first observation was 16h 18m G.M.T. After about one minute the ray disappeared, but… (More)
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