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Abstract:

The geoeffective magnetic cloud (MC) of 20 November 2003 was associated with the 18 November 2003 solar active events in previous studies. In some of these, it was estimated that the magnetic helicity carried by the MC had a positive sign, as did its solar source, active region (AR) NOAA 10501. In this article we show that the large-scale magnetic field of AR 10501 has a negative helicity sign. Since coronal mass ejections (CMEs) are one of the means by which the Sun ejects magnetic helicity excess into interplanetary space, the signs of magnetic helicity in the AR and MC must agree. Therefore, this finding contradicts what is expected from magnetic helicity conservation. However, using, for the first time, correct helicity density maps to determine the spatial distribution of magnetic helicity injections, we show the existence of a localized flux of positive helicity in the southern part of AR 10501. We conclude that positive helicity was ejected from this portion of the AR leading to the observed positive helicity MC. © Springer Science+Business Media B.V. 2009.

Registro:

Documento: Artículo
Título:How can a negative magnetic helicity active region generate a positive helicity magnetic cloud?
Autor:Chandra, R.; Pariat, E.; Schmieder, B.; Mandrini, C.H.; Uddin, W.
Filiación:Observatoire de Paris, LESIA, UMR8109 (CNRS), 92195 Meudon Principal Cedex, France
NASA-GSFC, Space Weather Laboratory, 8800 Greenbelt Rd, Greenbelt, MD 20771, United States
College of Science, George Mason University, 4400 University Dr., Fairfax, VA 22030, United States
Instituto de Astronomía y Física del Espacio (IAFE), CONICET-UBA, Buenos Aires, Argentina
Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital 263 129, India
Palabras clave:Active regions; magnetic fields; Coronal mass ejections; interplanetary; Flares; dynamics, relation to magnetic field; Helicity; magnetic
Año:2009
Volumen:261
Número:1
Página de inicio:127
Página de fin:148
DOI: http://dx.doi.org/10.1007/s11207-009-9470-2
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v261_n1_p127_Chandra

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Citas:

---------- APA ----------
Chandra, R., Pariat, E., Schmieder, B., Mandrini, C.H. & Uddin, W. (2009) . How can a negative magnetic helicity active region generate a positive helicity magnetic cloud?. Solar Physics, 261(1), 127-148.
http://dx.doi.org/10.1007/s11207-009-9470-2
---------- CHICAGO ----------
Chandra, R., Pariat, E., Schmieder, B., Mandrini, C.H., Uddin, W. "How can a negative magnetic helicity active region generate a positive helicity magnetic cloud?" . Solar Physics 261, no. 1 (2009) : 127-148.
http://dx.doi.org/10.1007/s11207-009-9470-2
---------- MLA ----------
Chandra, R., Pariat, E., Schmieder, B., Mandrini, C.H., Uddin, W. "How can a negative magnetic helicity active region generate a positive helicity magnetic cloud?" . Solar Physics, vol. 261, no. 1, 2009, pp. 127-148.
http://dx.doi.org/10.1007/s11207-009-9470-2
---------- VANCOUVER ----------
Chandra, R., Pariat, E., Schmieder, B., Mandrini, C.H., Uddin, W. How can a negative magnetic helicity active region generate a positive helicity magnetic cloud?. Sol. Phys. 2009;261(1):127-148.
http://dx.doi.org/10.1007/s11207-009-9470-2