Abstract
On December 13, 1967, a KC-135 aircraft equipped with an ionospheric sounder, a photometer, and an all-sky camera made a flight into the midday portion of the auroral oval and the polar cap region between Greenland and Spitzbergen. Under the quiet magnetic conditions ( ΣK p = 10 −) occurring on that day, tho midday aurora consisted of a single arc which lay within the expected region of the oval. The aurora was absent inside the oval. There was a strong correlation between auroral E s and visible overhead aurora. Near the end of the flight when sunrise prevented optical observations of the aurora, the observed occurrence of E s was used to infer the width of the auroral oval.
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