Superposed epoch analysis and storm statistics from 25 years of the global geomagnetic disturbance index, USGS-Dst

Gannon, J.L.

Abstract:

Statistics on geomagnetic storms with minima below -50 nanoTesla are compiled using a 25-year span of the 1-minute resolution disturbance index, U.S. Geological Survey Dst. A sudden commencement, main phase minimum, and time between the two has a magnitude of 35 nanoTesla, -100 nanoTesla, and 12 hours, respectively, at the 50th percentile level. The cumulative distribution functions for each of these features are presented. Correlation between sudden commencement magnitude and main phase magnitude is shown to be low. Small, medium, and large storm templates at the 33rd, 50th, and 90th percentile are presented and compared to real examples. In addition, the relative occurrence of rates of change in Dst are presented.

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USGS Numbered Series

ProdID:

70039666

Citation Author:

Gannon, J.L.

Citation Contributing Office:

Geologic Hazards Science Center

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English

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Citation Phsyical Description:

iv; 15 p.

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Citation Publisher:

U.S. Geological Survey

Citation Series:

Open-File Report

Citation Series Code:

OFR

Citation Series Number:

2012-1167

Citation Search Results Text:

Superposed epoch analysis and storm statistics from 25 years of the global geomagnetic disturbance index, USGS-Dst; 2012; OFR; 2012-1167; Gannon, J.L.

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2012

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citation/reference

Text:

Superposed epoch analysis and storm statistics from 25 years of the global geomagnetic disturbance index, USGS-Dst; 2012; OFR; 2012-1167; Gannon, J.L.