Abstract
The aurora, as determined from the College HF multifrequency backscatter records, was present somewhere on the College geomagnetic meridian during 1965 a minimum of 65% of the time at any hour on the dayside of the earth, and 95% on the nightside. The southern boundary of the aurora (1) occurred at approximately 77° geomagnetic latitude during midday periods when Kp, the planetary magnetic activity index, was less than 4, (2) during mid-night periods occurred at approximately 70° when Kp was 0o, and 68° when Kp was less than 2, and (3) in general extended farther south at any hour as magnetic activity increased. The midday aurora on magnetically quiet days (Kp < 4) during the 1965 summer solstice was approximately 1.5° north of that during the winter solstice. The 1965 backscatter results agree closely with 1957 to 1959 optical results; thus, the position and the rate of occurrence of the dayside aurora for a given level of magnetic activity are almost independent of both season and solar activity.
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