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GEOPHYSICAL RESEARCH LETTERS,
VOL. 32,
L18103,
doi:10.1029/2005GL023486,
2005
A study on the peak Dst and peak negative Bz relationship during intense geomagnetic storms
W. D. Gonzalez
Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, Brazil
E. Echer
Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, Brazil Max-Planck-Institut fuer Sonnensystemforschung, Katlenburg-Lindau, Germany
Abstract
This paper is a study of the relationship between the geomagnetic storm index Dst and the southward component, Bs, of the
interplanetary magnetic field (IMF) driver. This study was performed during the ACE observational period (1997–2002), for
which 64 intense geomagnetic storms (Dst ≤ −85 nT) were analyzed. After taking into account the propagation time between the
L1 point and Earth (∼1 h) and the magnetosphere/ring current response-time to solar wind forcing (∼1 h), it was determined
that the average delay between the peak Bs and the peak Dst values is ∼2 h. It was also observed that the Bs value at peak
Dst is ∼75% of the peak Bs value in the entire event. When these results are analyzed in terms of the interplanetary electric
field, associated with Bz, some interesting additional studies are indicated, for which some simple results, of practical
space weather forecasting use, are anticipated.
Received 12
May
2005;
accepted 15
August
2005;
published 17
September
2005.
Index Terms: 2740 Magnetospheric Physics: Magnetospheric configuration and dynamics; 2778 Magnetospheric Physics: Ring current; 2780 Magnetospheric Physics: Solar wind interactions with unmagnetized bodies; 2788 Magnetospheric Physics: Magnetic storms and substorms (7954); 7954 Space Weather: Magnetic storms (2788).
Read Full Article (file size: 133736 bytes) Cited by
Citation: Gonzalez, W. D., and E. Echer
(2005),
A study on the peak Dst and peak negative Bz relationship during intense geomagnetic storms,
Geophys. Res. Lett.,
32,
L18103,
doi:10.1029/2005GL023486.
Copyright 2005 by the American Geophysical Union.
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