Other
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....14567k&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #14567
Other
Scientific paper
In this paper we show the results of thorough correlative analysis of different geomagnetic and solar indices calculated from the data registered since 1841 to the present in order to verify the conclusions of Loockwood et al (1999) that the total magnetic flux leaving the Sun has risen by a factor of 2,3 since 1901and increased by 40% from 1964 until 1996. The last result has been negated by Kotov and Kotova (2001) and Stozkov (2002), the earlier result of Loockwood is based on behaviour of annual means of aa index which showed an approximately linear rise in geomagnetic levels between about 1900 and sixties. It was firstly noticed by Mayaud (1972), who showed also the same trend in Ci index series. In this period smoothed sunspot number attained from cycle to cycle, but with relatively stable minimum value. Ponyavin (2001) has pointed out that the annual means of the data of planetary C9 index from 1890 to the present and C9 derived from Petersburg magnetic data (Zosimovic, 1981) dd not show such increase as aa index. aa has been derived from magnetograms of 2 nearly antipodal stations (Greenwich, 1868-1925 and Melbourne 1868-1919, Abinger, 1926-1956 and Toolangui, 1920-1979, Hartland, 1957 - until present, and Canberra, 1980- until present). As it is seen from the paper the quality of aa index in the early period till 15 solar cycle is not so good as indices obtained from one northern hemisphere observatory (A_k at Helsinki and C9 at Petersburg). The mean level of this indices in the time interval from 1841 to 1964 have been approximately constant. A_k obtained from Sodankyla has been slightly drift between 1914 and fifties. The quality of geomagnetic indices during the last solar cycles from 16 to 19 is much better than during an earlier time. hus, the suggestions about the rising of the total solar magnetic flux derived from the behavior of aa index is questionable and ought to be discussed and collated with of other old registrations.
Izdebska J.
Kobylinski Z.
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