A study of the morphology of geomagnetic storms

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Author
Sugiura, Masahisa
Keyword
Geomagnetism
Magnetic storms
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URI
http://hdl.handle.net/11122/15588
Abstract
The average morphology of magnetic storms with sudden commencement was studied with 346 magnetic storms that occurred in the years 1902 to 1945. Magnetic records from 26 observatories were used. The 346 magnetic storms were classed into three intensity groups of great, moderate and weak storms, and their morphology was investigated separately. The storm variation was analyzed into two parts, Dst and DS. DS was analyzed harmonically, and its changes with storm time were studied in great detail. The author’s present views on storm sudden commencements and on the abnormal nature of the storm variations at the geomagnetic equator are briefly reviewed in this report.
Description
UAG R-125.
Table of Contents
Abstract – 1. Introduction – 2. The material used in the study – 3. The intensity indices for the storms – 4. The definition of Sq, Dst, DS, and SD – 5. The method of analysis – 6. The storm time variations Dst – 7. The Sq, SD and DS variations – 8. A comparison of Dst and DS – 9. Remarks on the definition of DS and SD and on harmonic analysis of DS – 10. Remarks on sudden commencements – 11. The abnormal features of the storm variations at the geomagnetic equator – 12. Asymmetry of Dst with respect to the geomagnetic equator – 13. Concluding remarks – Acknowledgements – Reports submitted under contract AF 19(604)-2163 and its extension – References.
Date
1961-10
Publisher
Geophysical Institute at the University of Alaska Fairbanks
Type
Report
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