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SOLAR FLARE CYCLES , M. D. POPESCU1, 2
 

Summary: SOLAR FLARE CYCLES
G. MARI1
, M. D. POPESCU1, 2
1
Astronomical Institute of the Romanian Academy
Str. Cutitul de Argint nr. 5, RO-752121, Bucharest, Romania
gmaris@aira.astro.ro
2
Armagh Observatory
College Hill, Armagh, BT61 9DG, N. Ireland
mdp@star.arm.ac.uk
Abstract. We present a review of different solar flare periodicity intervals. Our analysis includes a
statistical investigation of flare occurrence and N-S hemispheric distribution over the last three 11-yr
solar cycles (SCs 21-23, corresponding to the period 1976-2001). Moreover, we try to estimate if
there is any connection between the flare activity and the strength of solar cycles. For that purpose,
we studied not only the number of flares occurring monthly and annually, but we also used two
indices that estimate the energy emitted by flares registered in the optical H line, as well as in the
soft X-ray 1-8 band. The strange behaviour of SC 22 descending phase, with short but intense
increments in flare activity, having a high degree of N-S asymmetry, could be the cause of the
"abnormal" appearance of SC 23. The new magnetic dipole begins to lose part of its energy even

  

Source: Armagh Observatory

 

Collections: Physics