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Abstract:

Context. Magnetic clouds are transient magnetic structures expulsed from the Sun that travel toward the external heliosphere carrying a significant amount of magnetic flux and helicity. Aims. To improve our understanding of magnetic clouds in relation to their solar source regions, we need a reliable method to compute magnetic flux and helicity in both regions. Here we evaluate the sensitivity of the results using different models, methods and magnetic cloud boundaries applied to the same magnetic cloud data. Methods. The magnetic cloud was observed by the spacecraft Wind on October 18-20, 1995. We analyze this cloud considering four different theoretical configurations (two force free and two non-force free) that have been previously proposed to model cloud fields. These four models are applied using two methods to determine the orientation of the cloud axis: minimum variance and simultaneous fitting. Finally, we present a new method to obtain the axial and azimuthal magnetic fluxes and helicity directly from the observed magnetic field when rotated to the cloud frame. Results, The results from the fitted models have biases that we analyze, The new method determines the centre and the rear boundary of the flux rope when the front boundary is known. It also gives two independent measurements in the front and back parts for the fluxes and helicity; they are free of model and boundary biases. We deduce that the leading flux of the magnetic cloud had reconnected with the overtaken solar wind magnetic field and estimate the fluxes and helicity present in the full cloud before this reconnection. © ESO 2006.

Registro:

Documento: Artículo
Título:A new model-independent method to compute magnetic helicity in magnetic clouds
Autor:Dasso, S.; Mandrini, C.H.; Démoulin, P.; Luoni, M.L.
Filiación:Institute de Astronomía y Física del Espacio, CC. 67 Suc. 28, 1428 Buenos Aires, Argentina
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Observatoire de Paris, LESIA, UMR 8109 (CNRS), 92195 Meudon Cedex, France
Palabras clave:Interplanetary medium; Sun: coronal mass ejections (CMEs); Sun: magnetic fields; Magnetic fields; Magnetic flux; Spacecraft; Sun; Interplanetary medium; Magnetic cloud boundaries; Sun: coronal mass ejections (CME); Sun: magnetic fields; Astronomy
Año:2006
Volumen:455
Número:1
Página de inicio:349
Página de fin:359
DOI: http://dx.doi.org/10.1051/0004-6361:20064806
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00046361_v455_n1_p349_Dasso.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v455_n1_p349_Dasso

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Citas:

---------- APA ----------
Dasso, S., Mandrini, C.H., Démoulin, P. & Luoni, M.L. (2006) . A new model-independent method to compute magnetic helicity in magnetic clouds. Astronomy and Astrophysics, 455(1), 349-359.
http://dx.doi.org/10.1051/0004-6361:20064806
---------- CHICAGO ----------
Dasso, S., Mandrini, C.H., Démoulin, P., Luoni, M.L. "A new model-independent method to compute magnetic helicity in magnetic clouds" . Astronomy and Astrophysics 455, no. 1 (2006) : 349-359.
http://dx.doi.org/10.1051/0004-6361:20064806
---------- MLA ----------
Dasso, S., Mandrini, C.H., Démoulin, P., Luoni, M.L. "A new model-independent method to compute magnetic helicity in magnetic clouds" . Astronomy and Astrophysics, vol. 455, no. 1, 2006, pp. 349-359.
http://dx.doi.org/10.1051/0004-6361:20064806
---------- VANCOUVER ----------
Dasso, S., Mandrini, C.H., Démoulin, P., Luoni, M.L. A new model-independent method to compute magnetic helicity in magnetic clouds. Astron. Astrophys. 2006;455(1):349-359.
http://dx.doi.org/10.1051/0004-6361:20064806