Abstract
We analysed geomagnetic storms, ground-level enhancements (GLEs), and Forbush decreases in cosmic-ray intensity that occurred in selected intervals. We used data of ground-based neutron monitors for the cosmic-ray intensity. We used the geomagnetic index Dst as a measure of the geomagnetic storm intensity. Solar observations and interplanetary plasma/field parameters were used to identify the solar cause(s), interplanetary structure(s), and physical mechanism(s) responsible for the geomagnetic storms, the Forbush decreases, and the GLEs of different amplitudes and time profiles; all of them occurring within four selected periods of one month each. The observed differences in cosmic-ray and geomagnetic-activity responses to the same solar sources were used to distinguish the structures and mechanisms responsible for transient cosmic-ray modulation and geomagnetic storms.
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Acknowledgements
We acknowledge the use of neutron monitor data and thank the station managers. Use of available CME/ICME/CIR catalogues and OMNI Web/NASA interplanetary plasma and field data is also acknowledged. The authors also thank the referee for helpful comments and suggestions.
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Badruddin, Kumar, A. Study of the Forbush Decreases, Geomagnetic Storms, and Ground-Level Enhancements in Selected Intervals and Their Space Weather Implications. Sol Phys 290, 1271–1283 (2015). https://doi.org/10.1007/s11207-015-0665-4
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DOI: https://doi.org/10.1007/s11207-015-0665-4