On the two-phase decay of the Dst-variation

Details On the two-phase decay of the Dst-variation On the two-phase decay of the Dst-variation

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2813f&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 17, p. 2813-2816

Physics

12

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Ring Current, Magnetospheric Physics: Storms And Substorms

Scientific paper

We discuss the well known observation that during the storm recovery phase the Dst-variation shows a two-stage decay pattern, decaying first quickly and then decaying with a larger decay parameter. This finding is discussed in the context of the magnetic storm which was observed on November 25-27, 1986. Contrary to frequently used interpretations as two spatially separated ion populations or two different atomic ion components, we propose an alternative explanation for this feature. We argue that during the recovery phase of the magnetic storm the Dst decay is controlled by the decay of a two current system: the ring current (DR) and the magnetospheric tail current (DT).

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