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Ann. Geophys., 26, 213-229, 2008
www.ann-geophys.net/26/213/2008/
© European Geosciences Union 2008
Magnetic clouds seen at different locations in the heliosphere
L. Rodriguez1, A. N. Zhukov1,2, S. Dasso3,4, C. H. Mandrini3, H. Cremades5, C. Cid6, Y. Cerrato6, E. Saiz6, A. Aran7, M. Menvielle8, S. Poedts9, and B. Schmieder10
1Solar Influences Data analysis Center, Royal Observatory of Belgium, Brussels, Belgium
2Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, Russia
3Instituto de Astronomía y Física del Espacio, CONICET-UBA, Buenos Aires, Argentina
4Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
5NASA Goddard Space Flight Center, Greenbelt, MD, USA
6Universidad de Alcala, Madrid, Spain
7Universitat de Barcelona, Spain
8Centre d'étude des Environnements Terrestre et Planétaires, Vélizy, France
9K.U. Leuven, Leuven, Belgium
10Observatoire de Paris, Meudon, France
Abstract. We analyze two magnetic clouds (MCs) observed in different points of the
heliosphere. The main aim of the present study is to provide a link between
the different aspects of this phenomenon, starting with information on the
origins of the MCs at the Sun and following by the analysis of in-situ
observations at 1 AU and at Ulysses. The candidate source regions were
identified in SOHO/EIT and SOHO/MDI observations. They were correlated with
H-α images that were obtained from ground-based observatories. Hints
on the internal magnetic field configuration of the associated coronal mass
ejections are obtained from LASCO C2 images. In interplanetary space,
magnetic and plasma moments of the distribution function of plasma species
(ACE/Ulysses) were analyzed together with information on the plasma
composition, and the results were compared between both spacecraft in order
to understand how these structures interact and evolve in their cruise from
the Sun to 5 AU. Additionally, estimates of global magnitudes of magnetic
fluxes and helicity were obtained from magnetic field models applied to the
data in interplanetary space. We have found that these magnetic
characteristics were well kept from their solar source, up to 5 AU where
Ulysses provided valuable information which, together with that obtained
from ACE, can help to reinforce the correct matching of solar events and
their interplanetary counterparts.
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