USGS One-minute Dst

Details USGS One-minute Dst USGS One-minute Dst

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51a1743g&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM51A-1743

Physics

[2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7900] Space Weather, [7954] Space Weather / Magnetic Storms, [7959] Space Weather / Models

Scientific paper

We present a low-latitude disturbance index with a one-minute time resolution, the USGS One-Minute Dst. Two versions of the index are produced - definitive and near-realtime - which utilize definitive and preliminary data, respectively, and data from the traditional 4 stations: Honolulu, San Juan, Kakioka, and Hermanus. A combination of time and frequency space analyses is used to identify and remove stationary periodic solar quiet signals and longer time scale secular variation components from the horizontal intensity magnetic field time series of the individual observatories. After they are isolated, disturbance signals from low-latitude observatories are combined to produce the USGS Dst index. The USGS Real-time Dst compares well to the Kyoto final Dst. In addition, an analysis of the assumed cosine form of geomagnetic disturbance latitude dependence is performed which shows varying behavior with disturbance level, and the improved accuracy of global disturbance sampling gained by including additional stations is presented.

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