Abstract
The correlations between variations in the geomagnetic cutoff rigidity of cosmic rays and the Dst and Kp geomagnetic indices and solar-wind and IMF parameters are calculated for the three phases of the magnetic storm of November 20–21, 2003: before the storm and during its main and recovery phases. The correlations are the strongest between variations in the cutoff rigidity and the Dst index during all stages. A significant correlation was recorded with the By component of IMF and the field magnitude B; the correlation with By dominated during the main phase, and the correlation with B was dominant during the recovery phase. There is also a high correlation with the dynamic parameters of solar activity during the main phase, especially with the solar-wind speed. As far as we know, hysteresis phenomena have been discovered for the first time in the relationship between the cosmic-ray cutoff rigidities and the parameters of the helio- and magnetosphere on the scale of the magnetic storm (with Moscow station as an example). Loop-like patterns formed, because the trajectories of variations in the cutoff rigidities versus the studied parameters during storm intensification (development of current systems) did not coincide with the trajectories during the recovery phase (decay of current systems). The correlations of the cutoff rigidities with Dst and Kp indices were characterized by a narrow hysteresis loop, and their correlations with the IMF parameters were characterized by a wide hysteresis loop. The hysteresis loops for the relationship between the cutoff rigidities and solar-wind density and pressure were disordered.
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ACKNOWLEDGMENTS
The equipment of the Angara Collective Use Center (http://ckp–rf.ru/ckp/3056/) and the Russian National Ground-Based Network of Cosmic Ray Stations was used to determine RGSM. We are grateful to the OMNI team for the use of the database created within the GSFC/SPDF OMNIWeb Project (http://omniweb.gsfc.nasa.gov). We are also grateful to the reviewer for useful remarks and suggestions.
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The work was partly supported by Program of Fundamental Scientific Research II.16.
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Translated by O. Ponomareva
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Ptitsyna, N.G., Danilova, O.A., Tyasto, M.I. et al. Dynamics of Cosmic-Ray Cutoff Rigidity and Magnetospheric Parameters during Different Phases of the Storm of November 20, 2003. Geomagn. Aeron. 61, 169–179 (2021). https://doi.org/10.1134/S0016793221010114
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DOI: https://doi.org/10.1134/S0016793221010114