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SPACE AND TIME FACTORS OF SOLAR FLARES GEO-EFECTIVENESS Ivanov V.G. , Miletsky E.V.
Central astronomical observatory of RAS, Saint-Petersburg, Russia, solar1@gao.spb.ru Abstract The dependence of the geo-effectiveness of solar flares upon their distribution over the surface of the Sun is investigated. The intensities of H flares were used as initial data. These data (more than 30000 flare events in time range 1980-1998) were divided into components according the ball and the space arrangement of the flare. The speed of the solar wind and indices aa, Kp, Dst were selected as parameters describing the level of the space weather perturbation. It is found that the average delay of the space weather perturbations with respect to the flare events is equal to about 2 days. It proved to be that not more than a third of the flares, even the most energetic ones of ball 3, essentially affect(s?) the space weather perturbations, with the most part of such geo-effective flares occurring in interval of solar longitude near the central meridian of the Sun (±30). No dependency was revealed between the geoeffectiveness of the flares and their longitudinal position. Qualitative relations are found between the parameters of flare activity and the perturbations of the space weather.

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E 1 2 3 1-3 9152 (29.0%) 1421 (4.6%) 197 (0.6%) 10770 (34.2%)

C 9218 (30.1%) 1565 (5.0%) 222 (0.7%) 11005 (35.8%)

W 7975 (25.6%) 1231 (4.0%) 152 (0.4%) 9358 (30.0%)

26345 (84.7%) 4217 (13.6%) 571 (1.7%) 31133 (100%)

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o o (­30 <<+30 ). 4. . INTAS 00-752 01-07-90289. 1. ..., .. / . 2001. . 42. 1. . 1-3. 2. .., .., .. / . 1999. . 39. 6 . 3-13. 3. .., .. / . 2002. . 42. 6. . 723-726. 4. Bogdanova S.P., Pudovkin M.I. / Proc. of 4-th Int. Conf. on Problems of Geocosmos. 2002. SPb. P. 3-7. 5. Obayashi T. /in Sol-Terr. Physics Acad. Press. New-York. 1967. P.107. 6. .., .. / - . 2002. . 2. . 54­56. 7. .., .. / . 2002. . 40. 1. . 3. 8. .., .. / . 2003. . 41. 2. . 115-119.