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James A. Van Allen lab journal, March 1958-September 1959

Page 147

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appreciable extent. - i.e. thermonuclear heating of the atmosphere. 11/23/1958 I understand that Homer Newell has recently noted that when one considers inter-stellar flight at velocities which are a significant fraction of c, say Beta = 1/3, he should be aware of the fact that the velocity of his vehicle with respect to stationary hydrogen ions is such as to produce a very intense radiation. For example, at Beta = 1/3, hydrogen ions would have a kinetic energy relative to the vehicle of the order of 50 Mev.
 
Van Allen Papers