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

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

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...

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Main Authors: A. Papaioannou, H. Mavromichalaki, E. Eroshenko, A. Belov, V. Oleneva
Format: Article
Language:English
Published: Copernicus Publications 2009-03-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/27/1019/2009/angeo-27-1019-2009.pdf
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spelling doaj-6627f4bc54ac48369ca6404b91051f7a2020-11-24T22:29:36ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762009-03-01271019102610.5194/angeo-27-1019-2009The burst of solar and geomagnetic activity in August–September 2005A. Papaioannou0H. Mavromichalaki1E. Eroshenko2A. Belov3V. Oleneva4Nuclear and Particle Physics Section, Department of Physics, University of Athens, 15771 Athens, GreeceNuclear and Particle Physics Section, Department of Physics, University of Athens, 15771 Athens, GreeceInstitute of Terrestrial Magnetism Ionosphere and Radio wave Propagation (IZMIRAN) 142092, Troitsk, Moscow Region, RussiaInstitute of Terrestrial Magnetism Ionosphere and Radio wave Propagation (IZMIRAN) 142092, Troitsk, Moscow Region, RussiaInstitute of Terrestrial Magnetism Ionosphere and Radio wave Propagation (IZMIRAN) 142092, Troitsk, Moscow Region, RussiaDuring 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.https://www.ann-geophys.net/27/1019/2009/angeo-27-1019-2009.pdf
collection DOAJ
language English
format Article
sources DOAJ
author A. Papaioannou
H. Mavromichalaki
E. Eroshenko
A. Belov
V. Oleneva
spellingShingle A. Papaioannou
H. Mavromichalaki
E. Eroshenko
A. Belov
V. Oleneva
The burst of solar and geomagnetic activity in August–September 2005
Annales Geophysicae
author_facet A. Papaioannou
H. Mavromichalaki
E. Eroshenko
A. Belov
V. Oleneva
author_sort A. Papaioannou
title The burst of solar and geomagnetic activity in August–September 2005
title_short The burst of solar and geomagnetic activity in August–September 2005
title_full The burst of solar and geomagnetic activity in August–September 2005
title_fullStr The burst of solar and geomagnetic activity in August–September 2005
title_full_unstemmed The burst of solar and geomagnetic activity in August–September 2005
title_sort burst of solar and geomagnetic activity in august–september 2005
publisher Copernicus Publications
series Annales Geophysicae
issn 0992-7689
1432-0576
publishDate 2009-03-01
description 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.
url https://www.ann-geophys.net/27/1019/2009/angeo-27-1019-2009.pdf
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