%0 Journal Article
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%@nexthigherunit 8JMKD3MGPCW/3EU29DP
%@archivingpolicy denypublisher denyfinaldraft24
%@usergroup administrator
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%3 Effects of the number.pdf
%2 sid.inpe.br/mtc-m17@80/2006/12.07.11.47.54
%4 sid.inpe.br/mtc-m17@80/2006/12.07.11.47
%X For at least 30 years now it has been well known that the Dst index can be modelled using the solar wind as input. Since then, many attempts have been made to improve the predictability of Dst using different approaches. These attempts are useful, for instance, to understand which features of the solar windmagnetosphere interactions are most important in producing magnetospheric activity and how the Dst index would improve the space weather forecast. The Dst index is by far the most reliable and simple indication that a magnetic storm is in progress. In this work, the effect of using more than four magnetic stations and shorter time intervals than the hourly averages used in Sugiura's procedures is evaluated. The discussion is based on the results presented by Burton in 1975 and Feldstein in 1984 considering 4 or 12 magnetic stations and time averages of 2.5 min for a magnetic disturbed period that occurred from February 728, 1967, including two geomagnetic storms. The analysis has shown that the global representation of a magnetic storm by the standard Dst (Sugiura) is well preserved either using 4, 6, 12 magnetic stations or using 1 h, 2.5 min 1 min averages. A brief review of the current understanding of Dst has been included to support the discussions. The analysis performed has shown that a more refined Dst index (time  and number of stations>4) would be useful to investigate the intrinsic processes and the different current systems involved in the ring current development during magnetic storms; the standard Dst, as it is conceived, is quite adequate to monitor geomagnetic storms and identify their overall features; concerning the magnetic stations normally considered, the inclusion of higher magnetic latitude stations (>35) may underestimate the observed Dst.
%8 Dec.
%N 18
%T Effects of the number of stations and time resolution on Dst derivation
%@secondarytype PRE PI
%K Earth's magnetosphere, Sun-Earth coupling, Geomagnetic storm, Dst index, Electrodynamical coupling.
%@group DGE-INPE-MCT-BR
%@group DGE-INPE-MCT-BR
%@group DGE-INPE-MCT-BR
%@secondarykey INPE-14425-PRE/9509
%@copyholder SID/SCD
%@issn 1364-6826
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%B Journal of Atmospheric and Solar-Terrestrial Physics
%P 2127-2137
%D 2006
%V 68
%A Mendes Júnior, Odim,
%A Costa, Aracy Mendes da,
%A Bertoni, Fernando Celso Perin,
%@dissemination WEBSCI; PORTALCAPES; AGU; MGA; COMPENDEX.
%@area CEA