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Long-term biases in geomagnetic K and aa indices

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Long-term biases in geomagnetic K and aa indices; 2011; Article; Journal; Annales Geophysicae; Love, J. J.

Summary

Analysis is made of the geomagnetic-activity aa index and its source K-index data from groups of ground-based observatories in Britain, and Australia, 1868.0-2009.0, solar cycles 11-23. The K data show persistent biases, especially for high (low) K-activity levels at British (Australian) observatories. From examination of multiple subsets of the K data we infer that the biases are not predominantly the result of changes in observatory location, localized induced magnetotelluric currents, changes in magnetometer technology, or the modernization of K-value estimation methods. Instead, the biases appear to be artifacts of the latitude-dependent scaling used to assign K values to particular local levels of geomagnetic activity. The biases [...]

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J.J. Love

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Type Scheme Key
local-index unknown 70036380
local-pk unknown 70036380
doi http://www.loc.gov/standards/mods/mods-outline-3-5.html#identifier doi:10.5194/angeo-29-1365-2011
series unknown Annales Geophysicae

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journalAnnales Geophysicae
parts
typevolume
value29
typeissue
value8
languageEnglish
citationTypeArticle

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