Abstract
The present communication is intended to cover a brief summary of the results obtained through analysis of the motion of charged particles in the earth's magnetic field and includes the following topics: 1. (a) The main cone, in any direction within which particles of a given energy may arrive at a given point on the earth. Latitude and azimuthal effects. Special cases of the latter: north-south and east-west asymmetries. The ratio of positive and negative primaries. 2. (b) The shadow cone, outside of which no particles of a given energy may arrive at a given point on the earth. 3. (c) The penumbra, i.e. the region intermediate between the main cone and the shadow cone in which certain directions are allowed and the others forbidden. 4. (d) The eccentricity of the earth's magnetic center and the longitude effect. The position of the earth's magnetic center. The earth's magnetic quadripole. 5. (e) The earth's magnetic field and the galactic rotation effect. 6. (f) The sun's magnetic field and some of the consequences of its existence. The knee of the latitude effect. Solar diurnal and annual variations. 7. (g) Preliminary communication on magnetic storms and cosmic ray intensity.
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