An erroneous Dst Index in 1971

Details An erroneous Dst Index in 1971 An erroneous Dst Index in 1971

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..443k&link_type=abstract

In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:

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Geomagnetic Activity

Scientific paper

Recently it has been shown (Takalo & Mursula 2001) that the diurnal UT variation depicted by the Dst index mainly results from an insufficient and asymmetric spatial coverage by the four Dst stations. Moreover, it was found that the Dst index exhibits an exceptionally large UT variation in 1971. In the present paper we study the UT variation of the Dst index, especially in order to compare the year 1971 with other times. We calculate the autocorrelation function of the Dst index and the diurnal UT variation by the superposed epoch analysis from the hourly Dst values. Both methods verify the exceptionally strong UT variation in 1971. We also recalculate the Dst index and compare this recalculated index with the original one. We conclude that the large UT variation in 1971 originates from an erroneous derivation of the original Dst index in this year.

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