@prefix skos: . skos:prefLabel "GEOMAGNETIC INDICES"@en ; a skos:Concept ; skos:narrower . skos:changeNote """2013-02-18 09:53:55.0 [tbs1979] Insert Concept add broader relation (DST INDEX [cdb4b514-75c4-4a1f-a4ad-1855fbd396ab,82409] - GEOMAGNETIC INDICES [ae35f430-6534-49de-8b4c-edfc1e98870a,62733]); """, """2013-03-11 15:00:18.0 [tbs1979] insert Definition (id: null text: A measure of variation in the geomagnetic field due to the equatorial ring current. It is computed from the H-components at approximately four near-equatorial stations at hourly intervals. 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 internationally designated 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 C2 for Geomagnetism, Kyoto University, Kyoto, Japan. language code: en); """ ; skos:definition "A measure of variation in the geomagnetic field due to the equatorial ring current. It is computed from the H-components at approximately four near-equatorial stations at hourly intervals. 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 internationally designated 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 C2 for Geomagnetism, Kyoto University, Kyoto, Japan."@en ; skos:prefLabel "DST INDEX"@en ; skos:inScheme ; skos:broader ; a skos:Concept .