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James A. Van Allen lab journal, September 1959-January 1961

Page 212

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On Saturday evening we had at ~ 1900 and at 2100 C.S.T. two good Explorer VII passes giving a very high intensity of penetrating particles -- presumably solar protons. ~ ((10 exponent 4) / (cm exponent 2) second) (E>30 Mev) on the Anton 302 and enough to drive the 112 "over the hump" to quite low
 
Van Allen Papers