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

Open-File Report 2012-1167

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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.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Superposed epoch analysis and storm statistics from 25 years of the global geomagnetic disturbance index, USGS-Dst
Series title:
Open-File Report
Series number:
2012-1167
Year Published:
2012
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Geologic Hazards Science Center
Description:
iv; 15 p.
Number of Pages:
19
Online Only (Y/N):
Y