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Open-File Report 2011-1030

U.S. Geological Survey Near Real-Time Dst Index

By J.L. Gannon,1 J.J. Love,1 P.A. Friberg,2 D.C. Stewart,1 and S.W. Lisowski2

1U.S. Geological Survey, Box 25046, Mail Stop 966, Federal Center, Denver CO 80225-0046
2Instrumental Software Technologies, Inc., PO Box 963, New Paltz, NY 12561

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The operational version of the United States Geological Survey one-minute Dst index (a global geomagnetic disturbance-intensity index for scientific studies and definition of space-weather effects) uses either four- or three-station input (including Honolulu, Hawaii; San Juan, Puerto Rico; Hermanus, South Africa; and Kakioka, Japan; or Honolulu, San Juan and Guam) and a method based on the U.S. Geological Survey definitive Dst index, in which Dst is more rigorously calculated. The method uses a combination of time-domain techniques and frequency-space filtering to produce the disturbance time series at an individual observatory. The operational output is compared to the U.S. Geological Survey one-minute Dst index (definitive version) and to the Kyoto (Japan) Final Dst to show that the U.S. Geological Survey operational output matches both definitive indices well.

First posted February 10, 2011

For additional information contact:

USGS Geologic Hazards Science Center
Box 25046, MS-966
Denver, CO 80225

This report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Gannon, J.L., Love, J.J., Friberg, P.A., Stewart, D.C., and Lisowski, S.W., 2011, U.S. Geological Survey Near Real-Time Dst Index: U.S. Geological Survey Open-File Report 2011–1030, 10 p.





Definitive Dst

Near Real-Time Dst


Magworm System




References Cited

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