Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...431..359j&link_type=abstract
Astronomy and Astrophysics, v.431, p.359-363 (2005)
Astronomy and Astrophysics
Astrophysics
19
Sun: Activity, Sun: Flares
Scientific paper
The paper presents the results of an analysis of the north-south (N-S) and east-west (E-W) distribution of Hα solar flares from 1996 to 2003. This period of investigation corresponds to the ascending phase, the maximum and part of descending phase of solar cycle 23. It has been found that the flare activity during this cycle is low compared to previous solar cycles. The pattern of N-S distribution of flare occurrence shows that after solar activity minimum in 1996 the northern hemisphere was more active in producing flares than the southern one. The dominance of northern hemisphere is shifted towards the southern hemisphere after the solar maxima in 2000 and remained there in successive years. In both hemispheres (N and S), the flares are most prolific between 11° to 20° latitudes. Although the asymmetry in the E-W distribution of flare events is low, a consistent western dominance has been found. In more intense flares (Importance ≥1) there are some longitudinal bands where flare occurrence is higher than in adjacent bands.
Tables \ref{t2} and \ref{t3} are only available in electronic form at http://www.edpsciences.org
Joshi Bhuwan
Pant Prita
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