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James A. Van Allen lab journal, September 1959-January 1961
Page 61
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3/5/60 Yesterday morning there was a very nice set of "sun-dogs" visible from sunrise until ~ 10 AM C.S.T. [sketch/picture] drawing of sun bracketed on left and right with two parentheses-like arcs of light, having reddish insides Very clear sky, crisp and cold Temperature (surface) had dropped to ~ -5 degrees Fahrenheit during the night from ~+20 degrees Fahrenheit during the day.
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3/5/60 Yesterday morning there was a very nice set of "sun-dogs" visible from sunrise until ~ 10 AM C.S.T. [sketch/picture] drawing of sun bracketed on left and right with two parentheses-like arcs of light, having reddish insides Very clear sky, crisp and cold Temperature (surface) had dropped to ~ -5 degrees Fahrenheit during the night from ~+20 degrees Fahrenheit during the day.
Van Allen Papers
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