I 11ii

Figure 2.113: Differential energy spectra of energetic electrons at depths of 291 and 637 g/cm2 over Fort Churchill, Canada (Fulks and Meyer, 1974).

Figure 2.113: Differential energy spectra of energetic electrons at depths of 291 and 637 g/cm2 over Fort Churchill, Canada (Fulks and Meyer, 1974).

A Fulks and Meyer (1974), measurement at 291 gem-2 • Fulks and Meyer (1974), measurement at 637 gem-2 1 , 2 Daniel and Stephens (1974), theoretical

Figure 2.114: Observed and theoretical differential energy spectra of electrons at various atmospheric depths over Fort Churchill for the period of minimum solar modulation (Daniel and Stephens 1974). The symbols and letters identify the altitudes, the numbers the experiment. Note the scale factors attached to A, B and C. The ordinate readings for curve A (o) must be multiplied by 0.01 to get the true intensities, those of the curve groups B (V) and C (•) must both be multiplied by 10.

Figure 2.114: Observed and theoretical differential energy spectra of electrons at various atmospheric depths over Fort Churchill for the period of minimum solar modulation (Daniel and Stephens 1974). The symbols and letters identify the altitudes, the numbers the experiment. Note the scale factors attached to A, B and C. The ordinate readings for curve A (o) must be multiplied by 0.01 to get the true intensities, those of the curve groups B (V) and C (•) must both be multiplied by 10.

1 Beuermann et al. (1970) A

2 Rockstroh and Webber (1969) B

3 Beedle (1970) C

4 Schmidt (1972) D Beuermann (1971) calc. E

— Daniel and Stephens (1974), calculation - best eye fit to experimental data

Figure 2.115: Atmospheric depth dependence of the exponent of the differential energy spectrum, j(E) oc E'1, of electrons of energy > 30 MeV (Galper et al., 1975). The contours indicate the size of the errors.

Atmospheric Depth [ g cm ]

Figure 2.115: Atmospheric depth dependence of the exponent of the differential energy spectrum, j(E) oc E'1, of electrons of energy > 30 MeV (Galper et al., 1975). The contours indicate the size of the errors.

in N

0 0

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