Solar Extreme Events of 2003:
Fundamental Science and Applied Aspects

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Ishkov V.N.,

The current 23 cycle of solar activity (SA) under all characteristics concerns to cycles of average size. For 8 years of development of the current solar cycle it is registered only four flares with a x-ray importance X?10 (for example, 1 C 15 June, 1991 only, its was 5) and three of them were the main one during the concerned of greatest flare activity period 19.10 - 04.11.2003. At this time three big sunspot groups passed a visible solar disk: one C in a southern hemisphere, the biggest on the sunspot group area in the current solar cycle and two C in northern. The flare-active period began from occurrence when the first of them showed up on east limb (17.10). The rapid development in the first days of AR10484 (N05L353 C 2-nd rotation AR10464) in which on already 19.10 flare  1.1/1N was occurrences. After of the new powerful magnetic flux emerges 26.10 its area increased up to 1700 m.s.h., and two more large flares ( 1.2/2N and R7.6/2N) was occurrences. Then 29.10 this active region passed the western limb in full development. After an (21.10) on a visible disk of the Sun of the big group of spots AR10486 (S16L286) appearances, 23.10 in it there were flares  5.4/1? and  1.1/1N was occurrences. and 24.10 C flares R7.6/1N. 24-25.10 in this AR there was a first observable emergence of the powerful magnetic flux increased the area of sunspot group on 800 m.s.h. (Sp=2200 m.s.h.), which consequence were flares  1.2/3? (26.10), R5.0/1F and R6.7/1F (27.10). Emergence of the following new magnetic flux (27 C 28.10), increased the area of sunspot group up to record value for the current cycle C Sp=2610 m.s.h., it has allowed to be carried out to flare  17.3/4? 28.10. The following period flare occurrence in the given AR began 02.11 flare  8.3/2? and has proceeded 4.11 most intensive in the current cycle flare X> 17.5/3?. Last flares have taken place near to western limb the Sun and essential influence on geomagnetic conditions have not made, however solar proton events of class S3 and S2 were carried out (maxima 2 and 4.10 accordingly). In total for 16 day in these 3 AR 16 large flares were carried out, 11 from which had x-ray importance X. Evolutionary and flare characteristics of active regions can be presented in the following table: -------------------------------------------------------------------------------------------------------------------------------------------- AR 10484 (N03L354, CMP 24,0.10.03, R2) Sp max = 1750 .s.h., EKC, XRI=5.73 X2+M16+C28; 23+11+S73; PFER I (13h) C 19.10 C X1+M2; PFER II (58h) C 25 C27.10 C X1+M77.6; AR 10486 (S17L283, CMP 29,3.10.03) Sp max = 2610 .s.h., FKC, ; 62.56< XRI?73.06 X7+M16+C16; 41+32+17+S49; PFER I (59h) C 22 C 24.10 C X25.4+M69.9;7.6; PFER II (59h) C 27 C 29.10 C X217;10+M45;6.7; PFER III (85h) C 01 C 05.11 C X28.3;28+M65.3; AR 10488 (N08L291, CMP 28,4.10.03 C has formed on  09 27.10) Sp max = 1750 .s.h., FKC, ; XRI =8.57 X3+M7+C17; 22+12+S48; PFER (41h) C 02.10 C 04.11 C  2+R2;

Skobeltsyn Institute of Nuclear Physics, Moscow State University, 2004