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James A. Van Allen journal, October 1955-March 1958
Page 172
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horizon at its best, then faded out. The display in the [northern?] sky extending nearly to the southern horizon. Tried 5577 A degrees (+-30 A) interference filter. Brightness considerably reduced, but still quite visible to naked eye. 1:30-2:00 took a number of photographs at f/3.5 with [verichrome? film (speed 80 ) at various exposures ranging from 2 seconds to 1 minute.
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horizon at its best, then faded out. The display in the [northern?] sky extending nearly to the southern horizon. Tried 5577 A degrees (+-30 A) interference filter. Brightness considerably reduced, but still quite visible to naked eye. 1:30-2:00 took a number of photographs at f/3.5 with [verichrome? film (speed 80 ) at various exposures ranging from 2 seconds to 1 minute.
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