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Solar wind drivers of geomagnetic storms during more than four solar cycles


Richardson, IG and Cane, HV, Solar wind drivers of geomagnetic storms during more than four solar cycles, Journal of Space Weather and Space Climate, 2 pp. 1-9. ISSN 2115-7251 (2012) [Refereed Article]


Copyright Statement

Copyright 2012 The Authors. Licensed under Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)

DOI: doi:10.1051/swsc/2012001


Using a classification of the near-Earth solar wind into three basic flow types: (1) High-speed streams associated with coronal holes at the Sun; (2) Slow, interstream solar wind; and (3) Transient flows originating with coronal mass ejections (CMEs) at the Sun, including interplanetary CMEs and the associated upstream shocks and post-shock regions, we determine the drivers of geomagnetic storms of various size ranges based on the Kp index and the NOAA "G" criteria since 1964, close to the beginning of the space era, to 2011, encompassing more than four solar cycles (20-23). We also briefly discuss the occurrence of storms since the beginning of the Kp index in 1932, in the minimum before cycle 17. We note that the extended low level of storm activity during the minimum following cycle 23 is without precedent in this 80-year interval. Furthermore, the "typical" numbers of storm days/cycle quoted in the standard NOAA G storm table appear to be significantly higher than those obtained from our analysis, except for the strongest (G5) storms, suggesting that they should be revised downward.

Item Details

Item Type:Refereed Article
Keywords:Solar wind; Interplanetary Coronal Mass Ejection (CME); Storm; Stream; Solar cycle
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Solar physics
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Cane, HV (Dr Hilary Cane)
ID Code:110768
Year Published:2012
Web of Science® Times Cited:84
Deposited By:Mathematics and Physics
Deposited On:2016-08-12
Last Modified:2017-11-01
Downloads:149 View Download Statistics

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