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| Titel |
Results of Russian geomagnetic observatories in the 19th century: magnetic activity, 1841-1862 |
| VerfasserIn |
H. Nevanlinna, L. Häkkinen |
| 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 ; 28, no. 4 ; Nr. 28, no. 4 (2010-04-12), S.917-926 |
| Datensatznummer |
250016814
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| Publikation (Nr.) |
 copernicus.org/angeo-28-917-2010.pdf |
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| Zusammenfassung |
| Hourly (spot readings) magnetic data (H- and D-components) were digitized from
Russian yearbook tables for the years 1850–1862 from four observatories. The
pdf pictures for digitization were taken by a normal digital camera. The
database obtained consists of about 900 000 single data points. The time
series of hourly magnetic values reveal slow secular variations (declination
only) as well as transient and regular geomagnetic variations of external
origin. The quality and homogeneity of the data is satisfactory. Daily
Ak-indices were calculated using the index algorithm that has been earlier
applied to 19th century data from Helsinki (Finland) as well as modern
magnetic observatory recordings. The activity index series derived from the
Russian data is consistent with earlier activity index series for 1850–1862.
The digitized index data series derived in this study was extended back to
1841 by including magnetic C9 activity index data available from a Russian
observatory (St. Petersburg). Magnetic data rescued here is well suitable
for various reconstructions for studies of the long-term variation of the
space weather in the 19th century. |
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