Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....10912m&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #10912
Physics
Scientific paper
One of the by-products of the FMI algorithm for computer determination of K indices is the series of K-variations minute values. For both H and D components, the so-called K-variations are the difference between the actual observed magnetic variations and the estimated diurnal variation. IAGA planetary geomagnetic activity indices are computed using K-indices that characterize the K-variations over 3-hour intervals. It is shown that each individual K index provides a rough but statistically relevant estimate of the magnetic energy density embedded in the K-variations, as predicted from semi-quantitative arguments (Menvielle, Ann. Géophys., 35, 189, 1979). The K-derived planetary geomagnetic indices therefore monitors the evolution with time of this energy, with a time resolution of 3 hours. The availability of K-variations minutes values makes it possible to derive quantities that monitor the magnetic energy density with a time resolution better than 3-hours. Examples of such quantities are presented and discussed.
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