An empirical formula relating the geomagnetic storm's intensity to the interplanetary parameters: -<formula-native notation="TeX">$\overline{VBz}$ and Δt

Details An empirical formula relating the geomagnetic storm's intensity to the interplanetary parameters: -<formula-native notation="TeX">$\overline{VBz}$ and Δt An empirical formula relating the geomagnetic storm's intensity to the interplanetary parameters: -<formula-native notation="TeX">$\overline{VBz}$ and Δt

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30tssc2w&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 20, pp. SSC 2-1, CiteID 2039, DOI 10.1029/2003GL017901

Physics

15

Interplanetary Physics: Interplanetary Magnetic Fields, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Storms And Substorms

Scientific paper

We statistically study 105 geomagnetic storms with a Dst peak value <= -50 nT during 1998-2001 to examine the influence of the interplanetary parameters -$\overline{VBz}$ and its duration Δt on the intensity of geomagnetic storms. About 33% of the events are associated with intense storms with Dstmin <= -100 nT. It is found that -$\overline{VBz}$ is much more important than Δt for the formation of geomagnetic storms. A stronger -$\overline{VBz}$ can produce a more intense storm, whereas a longer Δt can not. A simple empirical formula relating the Dst peak value to -$\overline{VBz}$ and Δt is obtained, which shows a good correlation (CC = 0.9528) between the estimate value and the observations. This formula suggests that a compressed Bs field tends to have a more prominent geoeffectiveness. Moreover, we also identify 33 large -$\overline{VBz}$ intervals with -$\overline{VBz}$ > 5 mV/m and Δt > 3 hours in the same study interval, and find that they all caused intense storms (Dstmin <= -100 nT) and 8/9 of the great storms (Dstmin <= -200 nT) were due to interplanetary compressed structures.

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