Spacecraft Measurement of Forbush Decreases in the Cosmic Radiation

Details Spacecraft Measurement of Forbush Decreases in the Cosmic Radiation Spacecraft Measurement of Forbush Decreases in the Cosmic Radiation

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..168..195i&link_type=abstract

Solar Physics, Volume 168, Issue 1, pp.195-203

Physics

9

Scientific paper

The Forbush decrease in the cosmic radiation has been measured by a charged-particle monitor (E p )> 50 MeV) on board the OGO-6 satellite. For the events of June 7 10, September 27 30, and November 21 December 6, 1969, the Forbush decrease totalled 4.6, 6, and 6% in amplitude, respectively, for the Mt. Washington neutron monitor (P c = 1.24 GV), and 5.2, 13, and 16%, respectively, for the OGO-6 charged-particle monitor in the polar region (P c < 0.3 GB). The depression in the OGO-6 charged-particle monitor was larger at higher geomagnetic latitudes than at lower latitudes. However, for the events of June 7 10 and November 21 December 6, 1969, the Forbush decrease totalled 20 and 15% in amplitude respectively for the Pioneer 8 cosmic-ray telescope (P c > 0.4 GV), which was at the respective distances of 1.08 AU and 1 AU from the Sun. These results indicate that the Forbush decrease has greater effects on lower-energy charged particles, the magnitude of the effect also depending on the location of the detector with respect to the modulating region. The spacecraft data near Earth also showed that, for vertical cut-off rigidities P c ≤ 1.8 GV, the total percentage decrease in the amplitudes of the Forbush decreases can be represented by -mP c + k, where m and k are each constant for the particular Forbush decrease but which increase with increasing Mt. Washington neutron monitor monthly average rates, an indication of a flattening of the rigidity dependence of Forbush decreases towards maximum solar modulation.

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