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| Titel |
Correction of errors in scale values for magnetic elements for Helsinki |
| VerfasserIn |
L. Svalgaard |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 6 ; Nr. 32, no. 6 (2014-06-05), S.633-641 |
| Datensatznummer |
250121069
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| Publikation (Nr.) |
 copernicus.org/angeo-32-633-2014.pdf |
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| Zusammenfassung |
| Using several lines of evidence we show that the scale values of the
geomagnetic variometers operating in Helsinki in the 19th century were not
constant throughout the years of operation 1844–1897. Specifically, the
adopted scale value of the horizontal force variometer appears to be too low
by ~ 30% during the years 1866–1874.5 and the adopted scale value
of the declination variometer appears to be too low by a factor of ~ 2
during the interval 1885.8–1887.5. Reconstructing the heliospheric magnetic
field strength from geomagnetic data has reached a stage where a reliable
reconstruction is possible using even just a single geomagnetic data set of
hourly or daily values. Before such reconstructions can be accepted as
reliable, the underlying data must be calibrated correctly. It is thus
mandatory that the Helsinki data be corrected. Such correction has been
satisfactorily carried out and the HMF strength is now well constrained back
to 1845. |
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