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Abstract:

The solar wind conditions at one astronomical unit (AU) can be strongly disturbed by interplanetary coronal mass ejections (ICMEs). A subset, called magnetic clouds (MCs), is formed by twisted flux ropes that transport an important amount of magnetic flux and helicity, which is released in CMEs. At 1 AU from the Sun, the magnetic structure of MCs is generally modeled by neglecting their expansion during the spacecraft crossing. However, in some cases, MCs present a significant expansion. We present here an analysis of the huge and significantly expanding MC observed by the Wind spacecraft during 9∈-∈10 November 2004. This MC was embedded in an ICME. After determining an approximate orientation for the flux rope using the minimum variance method, we obtain a precise orientation of the cloud axis by relating its front and rear magnetic discontinuities using a direct method. This method takes into account the conservation of the azimuthal magnetic flux between the inbound and outbound branches and is valid for a finite impact parameter (i.e., not necessarily a small distance between the spacecraft trajectory and the cloud axis). The MC is also studied using dynamic models with isotropic expansion. We have found (6.2±1.5)×1020 Mx for the axial flux and (78±18)×1020 Mx for the azimuthal flux. Moreover, using the direct method, we find that the ICME is formed by a flux rope (MC) followed by an extended coherent magnetic region. These observations are interpreted by considering the existence of a previously larger flux rope, which partially reconnected with its environment in the front. We estimate that the reconnection process started close to the Sun. These findings imply that the ejected flux rope is progressively peeled by reconnection and transformed to the observed ICME (with a remnant flux rope in the front part). © 2007 Springer Science+Business Media B.V.

Registro:

Documento: Artículo
Título:Progressive transformation of a flux rope to an ICME : CCComparative analysis using the direct and fitted expansion methods
Autor:Dasso, S.; Nakwacki, M.S.; Démoulin, P.; Mandrini, C.H.
Filiación:Instituto de Astronomía y Física del Espacio, CONICET-UBA, CC. 67, Suc. 28, Buenos Aires 1428, Argentina
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires 1428, Argentina
Observatoire de Paris, LESIA, UMR 8109 (CNRS), Meudon Principal Cedex 92195, France
Palabras clave:Coronal mass ejection: interplanetary; Magnetic fields: interplanetary; Magnetic reconnection: observational signatures; Solar wind: disturbances
Año:2007
Volumen:244
Número:1-2
Página de inicio:115
Página de fin:137
DOI: http://dx.doi.org/10.1007/s11207-007-9034-2
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v244_n1-2_p115_Dasso

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Citas:

---------- APA ----------
Dasso, S., Nakwacki, M.S., Démoulin, P. & Mandrini, C.H. (2007) . Progressive transformation of a flux rope to an ICME : CCComparative analysis using the direct and fitted expansion methods. Solar Physics, 244(1-2), 115-137.
http://dx.doi.org/10.1007/s11207-007-9034-2
---------- CHICAGO ----------
Dasso, S., Nakwacki, M.S., Démoulin, P., Mandrini, C.H. "Progressive transformation of a flux rope to an ICME : CCComparative analysis using the direct and fitted expansion methods" . Solar Physics 244, no. 1-2 (2007) : 115-137.
http://dx.doi.org/10.1007/s11207-007-9034-2
---------- MLA ----------
Dasso, S., Nakwacki, M.S., Démoulin, P., Mandrini, C.H. "Progressive transformation of a flux rope to an ICME : CCComparative analysis using the direct and fitted expansion methods" . Solar Physics, vol. 244, no. 1-2, 2007, pp. 115-137.
http://dx.doi.org/10.1007/s11207-007-9034-2
---------- VANCOUVER ----------
Dasso, S., Nakwacki, M.S., Démoulin, P., Mandrini, C.H. Progressive transformation of a flux rope to an ICME : CCComparative analysis using the direct and fitted expansion methods. Sol. Phys. 2007;244(1-2):115-137.
http://dx.doi.org/10.1007/s11207-007-9034-2