Abstract
Using ground-based cosmic-ray (CR) observations on the worldwide network of neutron monitors, we have studied the variations in CR rigidity spectrum, anisotropy, and planetary system of geomagnetic cutoff rigidities during Forbush decreases in March-April 2001 by the global spectrographic method. By jointly analyzing ground-based and satellite measurements, we have determined the parameters of the CR rigidity spectrum that reflect the electromagnetic characteristics of the heliospheric fields in each hour of observations within the framework of the model of CR modulation by the heliosphere’s regular electromagnetic fields. The rigidity spectra of the variations and the relative changes in the intensity of CRs with rigidities of 4 and 10 GV in the solar-ecliptic geocentric coordinate system are presented in specific periods of the investigated events.
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Original Russian Text © M.V. Kravtsova, V.E. Sdobnov, 2014, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2014, Vol. 40, No. 8, pp. 575–581.
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Kravtsova, M.V., Sdobnov, V.E. Analysis of Forbush decreases during strong geomagnetic disturbances in March–April 2001. Astron. Lett. 40, 519–525 (2014). https://doi.org/10.1134/S1063773714070044
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DOI: https://doi.org/10.1134/S1063773714070044