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

Page 83

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4/9/60 Our great magnetic storm of 31 March etc [and?]solar proton event as detected by Explorer VII quite successfully are my principal new interests at the moment. Proton intensity at maximum observed at ~10:18-10:28 U.T. on 1 April was ~ [30? 130?] times C.R. intensity ( E > 30 mev). This was the first prominent solar proton event since Explorer VII
 
Van Allen Papers