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Abstract:

Magnetic clouds (MCs) are objects of extreme importance in the heliosphere. They have a major role on releasing magnetic helicity from the Sun (with crucial consequences on the solar dynamo), they are the hugest transient object in the interplanetary medium, and the main actors for the Sun-Earth coupling. The comparison between models and observations is beginning to clarify several open questions on MCs, such as their internal magnetic configuration and their interaction with the ambient solar wind. Due to the decay of the solar wind pressure with the distance to the Sun, MCs are typically in expansion. However, their detailed and local expansion properties depend on their environment plasma properties. On the other hand, while it is well known that the solar cycle determines several properties of the heliosphere, the effects of the cycle on MC properties are not so well understood. In this work we review two major properties of MCs: (i) their expansion, and (ii) the magnetic flux and helicity that they transport through the interplanetary medium. We find that the amount of magnetic flux and helicity released via MCs during the last solar minimum (years 2007-2009) was significantly lower than in the previous one (years 1995-1997). Moreover, both MC size and mean velocity are in phase with the solar cycle while the expansion rate is weakly variable and has no relationship with the cycle. © 2012 International Astronomical Union.

Registro:

Documento: Artículo
Título:Magnetic clouds along the solar cycle: Expansion and magnetic helicity
Autor:Dasso, S.; Démoulin, P.; Gulisano, A.M.
Filiación:Instituto de Astronomía y Física Del Espacio, CONICET-UBA, CC. 67, Suc. 28, 1428 Buenos Aires, Argentina
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Observatoire de Paris, LESIA, UMR 8109 (CNRS), F-92195 Meudon Principal Cedex, France
Instituto Antártico Argentino (DNA), Cerrito 1248, Buenos Aires, Argentina
Palabras clave:coronal mass ejections (CMEs); interplanetary medium; magnetic clouds; magnetic fields; plasmas; solar wind
Año:2011
Volumen:7
Número:S286
Página de inicio:139
Página de fin:148
DOI: http://dx.doi.org/10.1017/S1743921312004759
Título revista:Proceedings of the International Astronomical Union
Título revista abreviado:Proc. Int. Astron. Union
ISSN:17439213
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_17439213_v7_nS286_p139_Dasso.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17439213_v7_nS286_p139_Dasso

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Citas:

---------- APA ----------
Dasso, S., Démoulin, P. & Gulisano, A.M. (2011) . Magnetic clouds along the solar cycle: Expansion and magnetic helicity. Proceedings of the International Astronomical Union, 7(S286), 139-148.
http://dx.doi.org/10.1017/S1743921312004759
---------- CHICAGO ----------
Dasso, S., Démoulin, P., Gulisano, A.M. "Magnetic clouds along the solar cycle: Expansion and magnetic helicity" . Proceedings of the International Astronomical Union 7, no. S286 (2011) : 139-148.
http://dx.doi.org/10.1017/S1743921312004759
---------- MLA ----------
Dasso, S., Démoulin, P., Gulisano, A.M. "Magnetic clouds along the solar cycle: Expansion and magnetic helicity" . Proceedings of the International Astronomical Union, vol. 7, no. S286, 2011, pp. 139-148.
http://dx.doi.org/10.1017/S1743921312004759
---------- VANCOUVER ----------
Dasso, S., Démoulin, P., Gulisano, A.M. Magnetic clouds along the solar cycle: Expansion and magnetic helicity. Proc. Int. Astron. Union. 2011;7(S286):139-148.
http://dx.doi.org/10.1017/S1743921312004759