Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh21b0108s&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH21B-0108
Other
1555 Time Variations: Diurnal To Secular, 2134 Interplanetary Magnetic Fields, 2784 Solar Wind/Magnetosphere Interactions, 2794 Instruments And Techniques, 7537 Solar And Stellar Variability
Scientific paper
We present a new long-term geomagnetic index (the IDV index) which has the property that it is a proxy of the magnitude of the interplanetary magnetic field at the Earth. The index is constructed (for any given station) as the monthly (or yearly) average of the differences (taken without regard to sign) of the hourly mean values of the hour following local midnight between two consecutive days. It is similar to the classical u-measure except that the differences are between one-hour values rather than daily means. The IDV index has a strong correlation (r=0.88) with the magnitude, B, of the IMF, but is uncorrelated (r=0.09) with the solar wind speed, V. Because other indices (e.g. aa and our own IHV) are strongly correlated with BV**2, the IDV index fords a way of separating the influence of B and V and thus determining both.
Cliver Edward W.
Svalgaard Leif
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