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Study of the Geoeffectiveness and Galactic Cosmic-Ray Response of VarSITI-ISEST Campaign Events in Solar Cycle 24

  • Earth-affecting Solar Transients
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Abstract

We analyze and compare the geomagnetic and galactic cosmic-ray (GCR) response of selected solar events, particularly the campaign events of the group International Study of Earth-affecting Solar Transients (ISEST) of the program Variability of the Sun and Its Terrestrial Impact (VarSITI). These selected events correspond to Solar Cycle 24, and we identified various of their features during their near-Earth passage. We evaluated the hourly data of geomagnetic indices and ground-based neutron monitors and the concurrent data of interplanetary plasma and field parameters. We recognized distinct features of these events and solar wind parameters when the geomagnetic disturbance was at its peak and when the cosmic-ray intensity was most affected. We also discuss the similarities and differences in the geoeffectiveness and GCR response of the solar and interplanetary structures in the light of plasma and field variations and physical mechanism(s), which play a crucial role in influencing the geomagnetic activity and GCR intensity.

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Acknowledgements

We acknowledge the use of Oulu and Rome neutron-monitor data and thank the station managers of these stations. Solar wind plasma and field data from the NASA/GSFC OMNI Web interface are also acknowledged. The VarSITI website of SCOSTEP, which provides information about MiniMax/ISEST events, was useful for this work.

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Authors and Affiliations

  1. Physics Department, Aligarh Muslim University, Aligarh, 202002, India

    O. P. M. Aslam

  2. Astronomy Department, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia

    Badruddin

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  1. O. P. M. Aslam
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  2. Badruddin
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Correspondence to Badruddin.

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The authors declare that they have no conflicts of interest.

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Earth-affecting Solar Transients

Guest Editors: Jie Zhang, Xochitl Blanco-Cano, Nariaki Nitta, and Nandita Srivastava

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Aslam, O.P.M., Badruddin Study of the Geoeffectiveness and Galactic Cosmic-Ray Response of VarSITI-ISEST Campaign Events in Solar Cycle 24. Sol Phys 292, 135 (2017). https://doi.org/10.1007/s11207-017-1160-x

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  • DOI: https://doi.org/10.1007/s11207-017-1160-x

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