Effects of a Ring Current on Cosmic Radiation. Impact Zones

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Abstract
An investigation of the effects of a ring current on the "0900" (geomagnetic local time) impact zone of flare-associated cosmic-ray intensity increases has been carried out using 55 trajectories calculated on an automatic computer. The particles considered have rigidities of 2 Bv, 6 Bv, and 10 Bv, and arrive at the earth from the vertical direction. Reasonable ring currents shift the longitude of impact by as much as half an hour from that predicted by the dipole theory. The shift may be in either direction, depending on the exact ring parameters chosen. Experimental data so far published are not sufficiently accurate to test the theory. Because of the finite width of observed impact zones together with the rather small shift predicted here, the experimental test is inherently difficult.

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