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James Van Allen journal, 1951?-December 1954
Page 164
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15 October 1954 Last Wednesday (the 6th) I gave a talk at the Johnson County Medical Society. I used my inflatable sphere for illustrating our work on cosmic rays at northern latitude. While thinking over the spinning of the earth and [crossed out eccentricity] (inclination to geographic axis) of the dipole (of magnetic representation of the earth's field), it occurred to me that perhaps the explanation of the latitude knee of the cosmic ray latitude effect may have its explanation therein. At first analysis seems nothing to this since C.R. particles travel many earth radii during an inappreciable rotation (i.e., charge [of? if?] geomagnetic latitude at a point [pixed?] in space) However, with aurorae it may be different. The mere rotation of the earth with its
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15 October 1954 Last Wednesday (the 6th) I gave a talk at the Johnson County Medical Society. I used my inflatable sphere for illustrating our work on cosmic rays at northern latitude. While thinking over the spinning of the earth and [crossed out eccentricity] (inclination to geographic axis) of the dipole (of magnetic representation of the earth's field), it occurred to me that perhaps the explanation of the latitude knee of the cosmic ray latitude effect may have its explanation therein. At first analysis seems nothing to this since C.R. particles travel many earth radii during an inappreciable rotation (i.e., charge [of? if?] geomagnetic latitude at a point [pixed?] in space) However, with aurorae it may be different. The mere rotation of the earth with its
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