Abstract A long database of corotating interaction regions (CIRs) is used to investigate their geoeffectiveness. Among 290 CIR events identified during Solar Cycle 24 (2008–2019), 88 (30%) are found to be geoeffective in causing geomagnetic storms with the symmetric ring current index [SYM-H] peak nT, and 202 (70%) are non-geoeffective with the minimum SYM-H nT. Based on a comparative study of the geoeffective and non-geoeffective CIRs, following results are obtained. Geoeffective and non-geoeffective CIRs have comparable duration ( hours, hours, respectively) and radial extent ( AU, AU, respectively), on average. While the mean solar-wind plasma speed during the geoeffective ( km s−1) and non-geoeffective ( km s−1) CIRs exhibits no statistical difference, the geoeffective CIRs have % higher peak plasma density, % higher ram pressure, % higher temperature, % higher interplanetary magnetic field (IMF) magnitude, % stronger IMF southward component, and % stronger reconnection electric field than the non-geoeffective events, on average. The auroral electrojet index [AE] and SYM-H are found to be, respectively, % and % stronger during the geoeffective CIRs than the non-geoeffective events. The typical characteristic solar-wind and geomagnetic activity parameters given in this article can be useful for space weather modeling and prediction purposes.
A comparative study on geoeffective and non-geoeffective corotating interaction regions
Advances in Space Research ; 71 , 1 ; 268-274
2022-09-22
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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