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Geomagnetic indices > Dst index

Terme préférentiel

Dst index  

Concept générique

Description

  • Name "Dst" came from "Disturbance storm-time". Dst (type of index: Equatorial index horizontal component disturbances; time resolution: 1-hour UT interval; unit: nT; availability: from 1957 onwards) is computed using 1-hour values from four low latitude observatories. Dst aims at monitoring the axis-symmetric magnetic signature of magnetosphere currents, including mainly the ring current, the tail currents and also the magnetopause Chapman-Ferraro current. At a given time, the Dst index is the average of variation over all longitudes; the reference level is set so that Dst is statistically zero on quiet days. An index of -50 or deeper indicates a storm-level disturbance, and an index of -200 or deeper is associated with middle-latitude auroras. Dst is determined by the World Data Center for Geomagnetism, Data Analysis Center for Geomagnetism and Space Magnetism, Kyoto University, Kyoto Japan. Dst time series is formally recognised and endorsed since 1969 by International Association of Geomagnetism and Aeronomy (IAGA).

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URI

https://service.poleterresolide.fr/voc/variable/V0010400

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RDF/XML TURTLE JSON-LD Dernière modification le 23/06/2021