Analysis of Three Real-Time Dst Indices

Details Analysis of Three Real-Time Dst Indices Analysis of Three Real-Time Dst Indices

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51a1742c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM51A-1742

Mathematics

Logic

[2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7934] Space Weather / Impacts On Technological Systems, [7954] Space Weather / Magnetic Storms

Scientific paper

The Dst is commonly used to specify geomagnetic disturbance periods and characterize the resulting ring current enhancements from ground-based horizontal magnetic field intensity measurements. Real-time versions of the Dst index are produced for operational purposes, and are of interest to many users, including the US military, airline industry, and power companies. USGS Real time Dst, Kyoto Quicklook Dst, and Space Environment Corporation RDst use preliminary data and use a variety of contributing observatories and processing methods. Both USGS and RDst use a combined time-and-frequency domain method and Kyoto uses a time domain only method in creating the Dst index. We perform an analysis of these three real time Dst indices for the time period of October 1, 2009 to May 31, 2010. The USGS 3, using three observatories instead of the standard four, and the Kyoto Sym-H index, are introduced in the analysis for comparison of observatory location with the three main Dst indices. We present a statistical study of the differences due to algorithm, output time resolution, and location of contributing observatories. Higher time resolution shows higher frequency fluctuations during disturbances and more defined storm features. There were small differences in mid- to low-latitude observatories during quiet to moderate storm time periods. The average impact on the index due to the different algorithms used was approximately 9 nT, and greater for individual storms.

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