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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 3
Ann. Geophys., 27, 1019-1026, 2009
https://doi.org/10.5194/angeo-27-1019-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 1019-1026, 2009
https://doi.org/10.5194/angeo-27-1019-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  02 Mar 2009

02 Mar 2009

The burst of solar and geomagnetic activity in August–September 2005

A. Papaioannou1, H. Mavromichalaki1, E. Eroshenko2, A. Belov2, and V. Oleneva2 A. Papaioannou et al.
  • 1Nuclear and Particle Physics Section, Department of Physics, University of Athens, 15771 Athens, Greece
  • 2Institute of Terrestrial Magnetism Ionosphere and Radio wave Propagation (IZMIRAN) 142092, Troitsk, Moscow Region, Russia

Abstract. During the August–September 2005 burst of solar activity, close to the current solar cycle minimum, a significant number of powerful X-ray flares were recorded, among which was the outstanding X17.0 flare of 7 September 2005. Within a relatively short period (from 22 August to 17 September) two severe magnetic storms were also recorded as well as several Forbush effects. These events are studied in this work, using hourly mean variations of cosmic ray density and anisotropy, derived from data of the neutron monitor network. During these Forbush effects the behavior of high energy cosmic ray characteristics (density and anisotropy) is analyzed together with interplanetary disturbances and their solar sources, and is compared to the variations observed in geomagnetic activity. A big and long lasting (~6 h) cosmic ray pre-decrease (~2%) is defined before the shock arrival on 15 September 2005. The calculated cosmic ray gradients for September 2005 are also discussed.

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