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Ruffenach, A.; Lavraud, B.; Farrugia, C.J.; Démoulin, P.; Dasso, S.; Owens, M.J.; Sauvaud, J.-A.; Rouillard, A.P.; Lynnyk, A.; Foullon, C.; Savani, N.P.; Luhmann, J.G.; Galvin, A.B. "Statistical study of magnetic cloud erosion by magnetic reconnection" (2015) Journal of Geophysical Research: Space Physics. 120(1):43-60
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Abstract:

Several recent studies suggest that magnetic reconnection is able to erode substantial amounts of the outer magnetic flux of interplanetary magnetic clouds (MCs) as they propagate in the heliosphere. We quantify and provide a broader context to this process, starting from 263 tabulated interplanetary coronal mass ejections, including MCs, observed over a time period covering 17 years and at a distance of 1 AU from the Sun with Wind (1995-2008) and the two STEREO (2009-2012) spacecraft. Based on several quality factors, including careful determination of the MC boundaries and main magnetic flux rope axes, an analysis of the azimuthal flux imbalance expected from erosion by magnetic reconnection was performed on a subset of 50 MCs. The results suggest that MCs may be eroded at the front or at rear and in similar proportions, with a significant average erosion of about 40% of the total azimuthal magnetic flux. We also searched for in situ signatures of magnetic reconnection causing erosion at the front and rear boundaries of these MCs. Nearly ∼30% of the selected MC boundaries show reconnection signatures. Given that observations were acquired only at 1 AU and that MCs are large-scale structures, this finding is also consistent with the idea that erosion is a common process. Finally, we studied potential correlations between the amount of eroded azimuthal magnetic flux and various parameters such as local magnetic shear, Alfvén speed, and leading and trailing ambient solar wind speeds. However, no significant correlations were found, suggesting that the locally observed parameters at 1 AU are not likely to be representative of the conditions that prevailed during the erosion which occurred during propagation from the Sun to 1 AU. Future heliospheric missions, and in particular Solar Orbiter or Solar Probe Plus, will be fully geared to answer such questions. ©2014. American Geophysical Union. All Rights Reserved.

Registro:

Documento: Artículo
Título:Statistical study of magnetic cloud erosion by magnetic reconnection
Autor:Ruffenach, A.; Lavraud, B.; Farrugia, C.J.; Démoulin, P.; Dasso, S.; Owens, M.J.; Sauvaud, J.-A.; Rouillard, A.P.; Lynnyk, A.; Foullon, C.; Savani, N.P.; Luhmann, J.G.; Galvin, A.B.
Filiación:Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, Toulouse, France
Centre National de la Recherche Scientifique, UMR, Toulouse, France
Space Science Center, University of New Hampshire, Durham, NH, United States
Observatoire de Paris, LESIA, UMR 8109 CNRS, Meudon, France
Instituto de Astronomía y Física Del Espacio, Buenos Aires, Argentina
Departamento de Ciencias de la Atmõsfera y Los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Space Environment Physics Group, University of Reading, Berkshire, Reading, United Kingdom
EMPS/CGAFD, University of Exeter, Exeter, United Kingdom
School of Physics, Astronomy and Computational Sciences, George Mason University, Fairfax, VA, United States
NASA Goddard, Greenbelt, MD, United States
Space Sciences Laboratory, University of California, Berkeley, CA, United States
Palabras clave:coronal mass ejection; magnetic cloud; magnetic flux rope; magnetic reconnection; solar wind
Año:2015
Volumen:120
Número:1
Página de inicio:43
Página de fin:60
DOI: http://dx.doi.org/10.1002/2014JA020628
Título revista:Journal of Geophysical Research: Space Physics
Título revista abreviado:J. Geophys. Res. Space Phys.
ISSN:21699380
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699380_v120_n1_p43_Ruffenach

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Citas:

---------- APA ----------
Ruffenach, A., Lavraud, B., Farrugia, C.J., Démoulin, P., Dasso, S., Owens, M.J., Sauvaud, J.-A.,..., Galvin, A.B. (2015) . Statistical study of magnetic cloud erosion by magnetic reconnection. Journal of Geophysical Research: Space Physics, 120(1), 43-60.
http://dx.doi.org/10.1002/2014JA020628
---------- CHICAGO ----------
Ruffenach, A., Lavraud, B., Farrugia, C.J., Démoulin, P., Dasso, S., Owens, M.J., et al. "Statistical study of magnetic cloud erosion by magnetic reconnection" . Journal of Geophysical Research: Space Physics 120, no. 1 (2015) : 43-60.
http://dx.doi.org/10.1002/2014JA020628
---------- MLA ----------
Ruffenach, A., Lavraud, B., Farrugia, C.J., Démoulin, P., Dasso, S., Owens, M.J., et al. "Statistical study of magnetic cloud erosion by magnetic reconnection" . Journal of Geophysical Research: Space Physics, vol. 120, no. 1, 2015, pp. 43-60.
http://dx.doi.org/10.1002/2014JA020628
---------- VANCOUVER ----------
Ruffenach, A., Lavraud, B., Farrugia, C.J., Démoulin, P., Dasso, S., Owens, M.J., et al. Statistical study of magnetic cloud erosion by magnetic reconnection. J. Geophys. Res. Space Phys. 2015;120(1):43-60.
http://dx.doi.org/10.1002/2014JA020628