Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..131...99l&link_type=abstract
Astronomy and Astrophysics Supplement, v.131, p.99-104
Astronomy and Astrophysics
Astrophysics
51
Sun: Activity, Sun: Flares, Sun: X-Rays
Scientific paper
The data of the X-ray flare events of class M>= 1 during the interval of 1987 to 1992 corresponding to the maximum period of the 22nd solar cycle have been investigated to study the North-South (N-S) and West-East (W-E) asymmetries. During that period it has been shown the existence of a real N-S asymmetry. That confirms recent studies done by using other indicators, such as sunspot areas \cite[(Oliver & Ballester 1994)]{oliv94}. The E-W asymmetry during that period is not significant but a non uniform flare distribution in longitude has been evidenced. That result is also in good agreement with the work made by \cite[Joshi (1995)]{josh95} using Hα flares for the same time period. We have shown that the behaviour of the reverse tendency of Solar Cycle 21 to exhibit a predominance of the southern hemisphere in the N-S asymmetry compared to the previous Solar Cycles (19 and 20) is maintained for Solar Cycle 22. A long period cycle of the N-S asymmetry could be suspected.
Li Kai-Jun
Li Q.-Sh.
Schmieder Brigitte
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