Conferencia
Abstract:
Magnetic clouds (MCs) are objects in expansion during their travel through the heliosphere. In situ observations indicate that their front travel faster than their back, showing a clear empirical signature of expansion. With the aim of quantifying the expansion rate of MCs in the inner heliosphere (0.3 to 1 AU), we present here a statistical study of events observed by the spacecraft Helios 1 and 2, during their complete period of operations. From the analysis of the profile of the MC magnetic field components in its local frame, which is obtained from a rotation of the observed magnetic field vectors to a system of reference oriented as the main axis of the flux rope, we revise a list of events identified in previous works and redefine improved MC boundaries/orientation for each event. We then split the sample into two subsets according to the characteristics of their velocity profiles, (a) those MCs with a significantly perturbed velocity profile due to the interaction with their surrounding solar wind (i.e. overtaken by streams) and (b) those that are not perturbed. We compute the dimensionless local expansion rate (ζ) for MCs defined by several works [e.g. Démoulin et al., Solar Phys, 250, 347-374 (2008)]. We find significantly different distribution of values for ζ when perturbed and non perturbed events are considered. Non perturbed MCs expand at rates ζ consistent with the expected value from the global pressure decay in the surrounding solar wind for increasing helio-distances, while perturbed ones may present strong departures from that global rule. We interpret these departures of ζ for perturbed MCs as a consequence of interaction with streams on their expansion. © 2010 American Institute of Physics.
Registro:
| Documento: | Conferencia |
| Título: | Evolution of magnetic clouds in the inner heliosphere |
| Autor: | Gulisano, A.M.; Démoulin, P.; Dasso, S.; Ruiz, M.E.; Marsch, E. |
| Ciudad: | Saint-Malo |
| Filiación: | Instituto de Astronomía Y Física del Espacio, CONICET-UBA, CC. 67, Suc. 28, 1428 Buenos Aires, Argentina Observatoire de Paris, LESIA, UMR 8109 (CNRS), F-92195 Meudon Principal Cedex, France Departamento de Física, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina Max-Planck-Institut für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany |
| Palabras clave: | Interplanetary physics; Magnetic clouds; Solar Wind |
| Año: | 2010 |
| Volumen: | 1216 |
| Página de inicio: | 391 |
| Página de fin: | 394 |
| DOI: | http://dx.doi.org/10.1063/1.3395884 |
| Título revista: | 12th International Solar Wind Conference |
| Título revista abreviado: | AIP Conf. Proc. |
| ISSN: | 0094243X |
| PDF: | https://bibliotecadigital.exactas.uba.ar/download/paper/paper_0094243X_v1216_n_p391_Gulisano.pdf |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0094243X_v1216_n_p391_Gulisano |
Referencias:
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Citas:
---------- APA ----------
Gulisano, A.M., Démoulin, P., Dasso, S., Ruiz, M.E. & Marsch, E. (2010) . Evolution of magnetic clouds in the inner heliosphere. 12th International Solar Wind Conference, 1216, 391-394.http://dx.doi.org/10.1063/1.3395884
---------- CHICAGO ----------
Gulisano, A.M., Démoulin, P., Dasso, S., Ruiz, M.E., Marsch, E. "Evolution of magnetic clouds in the inner heliosphere" . 12th International Solar Wind Conference 1216 (2010) : 391-394.http://dx.doi.org/10.1063/1.3395884
---------- MLA ----------
Gulisano, A.M., Démoulin, P., Dasso, S., Ruiz, M.E., Marsch, E. "Evolution of magnetic clouds in the inner heliosphere" . 12th International Solar Wind Conference, vol. 1216, 2010, pp. 391-394.http://dx.doi.org/10.1063/1.3395884
---------- VANCOUVER ----------
Gulisano, A.M., Démoulin, P., Dasso, S., Ruiz, M.E., Marsch, E. Evolution of magnetic clouds in the inner heliosphere. AIP Conf. Proc. 2010;1216:391-394.http://dx.doi.org/10.1063/1.3395884
