Magnetic-Cloud-Chamber Observations of Low-Energy Cosmic-Ray Electrons

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The flux of cosmic-ray electrons in the energy range $45<E<150$ MeV has been measured at balloon altitudes over a wide range of geomagnetic latitudes. The data obtained led to the following conclusions: (1) The flux of primary electrons in the above energy range is less than 35 particles/${\mathrm{m}}^{2}$-sec-sr. (2) The geomagnetic cutoff rigidity at Fort Churchill, Manitoba, is less than 45 MV; this is significantly less than the cutoff expected from the earth's interval field alone.