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Magnetospheric effects in cosmic rays during the unique magnetic storm in November 2003
Belov A.V., Eroshenko E.A., Yanke V.G., Pchelkin V.V., Mavromichalaki H,
Cosmic ray variations of magnetospheric origin during the severe magnetic storm on 20 November 2003 are selected from ground level observation data by means of the global survey method. Planetary distribution of the cut off rigidity variations during this disturbed period was obtained on this basis. For this event a correlation between Dst index and cut off rigidity variation was defined for each cosmic ray station. The most essential shift in cutoff rigidities occurred while Dst index was around -465 nT. Geomagnetic effect in cosmic ray intensity at some stations reached 6-8%. Cutoff rigidity variations were also calculated using the last model of magnetosphere from Tsyganenko 2003. This magnetospheric effect seems to be the greatest one over the history of neutron monitor observations. Maximum changes of geomagnetic cutoff rigidities was recorded this time at unusual low latitudes corresponded to about 8 GV cutoff rigidity. The results can be used in the neutron monitor data correction for magnetospheric effects and for the more accurate modelling as well of the magnetospheric current system during strong geomagnetic storms.