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James Van Allen journal, 1951?-December 1954

Page 89

At [55 exponent 1? 55 exponent 0?].

I(55 exponent 0? 55 exponent 1?) = 14.4 +- 1.4 particles / ((m exponent 2) second sterad) for C, N, O. (epsilon >= 0.35 Bev {geomagnetic cut-off} )

I(55 exponent 1?) = 4.2 +- 1.0 particles / ((m exponent 2) second sterad) for Z>10. (epsilon >= 0.55 Bev {due to range (ionization) [illegible]} )

Both have been corrected for nuclear absorption.
--------------------------------------------------------------------
Represents Winckler's spectrum by 
N(epsilon) = ((K)/((1 + epsilon) exponent 1.07))
Believes albedo may distort spectrum to give a low value of exponent.
--------------------------------------------------------------------
Summary of their spectral data:

For all nuclei Z.1

N(epsilon) = ((K)/((1 + epsilon) exponent 1.35))

epsilon kinetic energy per nucleon in Bev and K has the following values.

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At [55 exponent 1? 55 exponent 0?]. I(55 exponent 0? 55 exponent 1?) = 14.4 +- 1.4 particles / ((m exponent 2) second sterad) for C, N, O. (epsilon >= 0.35 Bev {geomagnetic cut-off} ) I(55 exponent 1?) = 4.2 +- 1.0 particles / ((m exponent 2) second sterad) for Z>10. (epsilon >= 0.55 Bev {due to range (ionization) [illegible]} ) Both have been corrected for nuclear absorption. -------------------------------------------------------------------- Represents Winckler's spectrum by N(epsilon) = ((K)/((1 + epsilon) exponent 1.07)) Believes albedo may distort spectrum to give a low value of exponent. -------------------------------------------------------------------- Summary of their spectral data: For all nuclei Z.1 N(epsilon) = ((K)/((1 + epsilon) exponent 1.35)) epsilon kinetic energy per nucleon in Bev and K has the following values.