On the relation between the SYM-H and Dst- indices during the development of magnetic storm
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On the relation between the SYM-H and Dst- indices during the development of magnetic storm

Статья в сборнике трудов конференций

Английский

Библиогр. в конце ст. (7 назв.)

550.383

вариации индексов SYM-H и Dst; магнитное поле; магнитный шторм; magnetic field ; magnetic storm; variations of the SYM-H and Dst-indices

Геофизика

Physics of auroral phenomena. – 2005

The Dst-index obtained by hourly average values of the magnetic field at four stations located in various longitudinal sectors at latitudes Φ′≈20-30° is the index of magnetic field depression at low latitudes during the magnetic storm periods. Recently for the characteristics of magnetic field depression the SYM-H index has been used. It is obtained from 1 min data of the magnetic field at ~10 stations, located mainly at latitudes Φ′≈40-50° [1]. It is considered in [2-4] that the SYM-H index is an analog of Dst but with a better temporal resolution. As shown in [5], during super magnetic storms with Dst variation ≥ 400 nT, the SYM-H variations can considerably differ from Dst behavior and thus the SYM-H index is not always an analog of Dst. In this paper the relation between the Dst and SYM-H variations for magnetic storms of different intensity, with Dst varying from ~ -50 nT to -450 nT is investigated.

Solovyev, S. I. On the relation between the SYM-H and Dst- indices during the development of magnetic storm / S. I. Solovyev, R. N. Boroyev, A. V. Moiseyev // Physics of auroral phenomena : proceedings of the 28 th annual seminar, 1-4 March 2005. – 2005. – P. 48-51.

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