Journal of Physical Studies 14(3), Article 3902 [13 pages] (2010) DOI: https://doi.org/10.30970/jps.14.3902 THE EXTREME SOLAR AND GEOMAGNETIC ACTIVITY OCTOBER-NOVEMBER 2003 I. S. Laba{1}, I. Ya. Pidstryhach{1}, Yu. P. Sumaruk{2}, T. P. Sumaruk{2}, P. V. Sumaruk{2}, O. A. Baran{1} {1}Astronomical Observatory of the Ivan Franko National University of Lviv, 8, Kyryla i Mefodija St., Lviv, UA--79005, Ukraine, e-mail: laba@astro.franko.lviv.ua {2}Geophysical Institute of the National Academy of Sciences of Ukraine, ‟Lviv” Magnetic observatory 32, Zalissya St., Ivano-Frankove, Lviv region, 81070, Ukraine

The influence of intensive flare energetic release on the terrestrial magnetosphere is studied according to the data from Astronomic Observatory of the Ivan Franko National University of Lviv, ‟Lviv” Magnetic Оbservatory of the Geophysical Institute of the National Academy of Sciences of Ukraine as well as GOES-10,\,-11,\,-12 and SOHO spaceships. During their two ‟passages” over visible part of the solar disk, three ARs produced 191 X-ray flares including powerful proton events, in particular the 4B/X17.2 on Oct.28, 2B/X10 on Oct.29 flares, and especially the 3B/X28 flare on Nov.4.2003: the largest event since the beginning of extra-atmospheric observations.

AR 10486, when localized near the central meridian, produced two very powerful flares on 28 and 29 Oct. and coronal mass ejections (CMEs) which were directed of the Earth. These two events had extreme influence upon the terrestrial magnetosphere and atmosphere and caused a very large magnetic storm from 29 to 31 Oct.2003.

The second very large magnetic storm between the 18th and 21st Nov.2003 was caused by a high level of flare activity from AR10501 (the second rotation of AR10484) during its crossing of the central meridian.

The CMEs of Oct.28 and 29th, Nov.18,2003 were extraordinary concerning their energetics and influence upon the terrestrial magnetosphere.

PACS number(s): 97.10.Ex

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