Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1059d&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A5, pp. SMP 5-1, CiteID 1059, DOI 10.1029/2000JA000430
Physics
7
Magnetospheric Physics: Ring Current, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Current Systems (2409)
Scientific paper
We perform a statistical study of the decay times for the recovery phase of the 300 most intense magnetic storms that occurred from 1 January 1957 to 31 December 1998. The Dst index in the decaying stage has been fitted by an exponential function, and a very good correlation has been obtained for most of the storms. Statistically representative values for the decay time (τ) are obtained by averaging the most reliable τ values, which resulted from applying a least squares method to the Dst index time series during every recovery phase. The mean value of τ turned out to be ~14 +/- 4 hours. We have also found that for very intense storms (Dstmin < -250 nT) the values of τ tend to decrease as the intensity of the storm increases.
Dasso Sergio
Gomez Daniel
Mandrini Cristina Hemilse
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