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Abstract:

Context. A large amount of magnetized plasma is frequently ejected from the Sun as coronal mass ejections (CMEs). Some of these ejections are detected in the solar wind as magnetic clouds (MCs) that have flux rope signatures. Aims. Magnetic clouds are structures that typically expand in the inner heliosphere. We derive the expansion properties of MCs in the outer heliosphere from one to five astronomical units to compare them with those in the inner heliosphere. Methods. We analyze MCs observed by the Ulysses spacecraft using in situ magnetic field and plasma measurements. The MC boundaries are defined in the MC frame after defining the MC axis with a minimum variance method applied only to the flux rope structure. As in the inner heliosphere, a large fraction of the velocity profile within MCs is close to a linear function of time. This is indicative of a self-similar expansion and a MC size that locally follows a power-law of the solar distance with an exponent called ζ. We derive the value of ζ from the in situ velocity data. Results. We analyze separately the non-perturbed MCs (cases showing a linear velocity profile almost for the full event), and perturbed MCs (cases showing a strongly distorted velocity profile). We find that non-perturbed MCs expand with a similar non-dimensional expansion rate (ζ = 1.05 ± 0.34), i.e. slightly faster than at the solar distance and in the inner heliosphere (ζ = 0.91 ± 0.23). The subset of perturbed MCs expands, as in the inner heliosphere, at a significantly lower rate and with a larger dispersion (ζ = 0.28 ± 0.52) as expected from the temporal evolution found in numerical simulations. This local measure of the expansion also agrees with the distribution with distance of MC size, mean magnetic field, and plasma parameters. The MCs interacting with a strong field region, e.g. another MC, have the most variable expansion rate (ranging from compression to over-expansion). © 2012 ESO.

Registro:

Documento: Artículo
Título:Expansion of magnetic clouds in the outer heliosphere
Autor:Gulisano, A.M.; Démoulin, P.; Dasso, S.; Rodriguez, L.
Filiación:Instituto de Astronomía y Física Del Espacio, CONICET-UBA, CC. 67, Suc. 28, 1428 Buenos Aires, Argentina
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Instituto Antártico Argentino (DNA), Cerrito 1248, CABA, Argentina
Observatoire de Paris, LESIA, UMR 8109 (CNRS), 92195 Meudon Principal Cedex, France
Solar-Terrestrial Center of Excellence-SIDC, Royal Observatory of Belgium, Brussels, Belgium
Palabras clave:Interplanetary medium; Magnetic fields; Magnetohydrodynamics (MHD); Solar wind; Sun: coronal mass ejections (CMEs); Astronomical units; Coronal mass ejection; Expansion properties; Expansion rate; Flux ropes; Heliospheres; In-situ; Interplanetary medium; Linear functions; Linear velocity; Magnetic clouds; Magnetized plasmas; Mean magnetic field; Minimum variance; Outer heliosphere; Plasma measurement; Plasma parameter; Power-law; Self-similar; Strong field; Sun: coronal mass ejection; Temporal evolution; Ulysses spacecraft; Velocity profiles; Magnetic fields; Magnetohydrodynamics; Magnetoplasma; Rope; Solar system; Solar wind; Velocity
Año:2012
Volumen:543
DOI: http://dx.doi.org/10.1051/0004-6361/201118748
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00046361_v543_n_p_Gulisano.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v543_n_p_Gulisano

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Citas:

---------- APA ----------
Gulisano, A.M., Démoulin, P., Dasso, S. & Rodriguez, L. (2012) . Expansion of magnetic clouds in the outer heliosphere. Astronomy and Astrophysics, 543.
http://dx.doi.org/10.1051/0004-6361/201118748
---------- CHICAGO ----------
Gulisano, A.M., Démoulin, P., Dasso, S., Rodriguez, L. "Expansion of magnetic clouds in the outer heliosphere" . Astronomy and Astrophysics 543 (2012).
http://dx.doi.org/10.1051/0004-6361/201118748
---------- MLA ----------
Gulisano, A.M., Démoulin, P., Dasso, S., Rodriguez, L. "Expansion of magnetic clouds in the outer heliosphere" . Astronomy and Astrophysics, vol. 543, 2012.
http://dx.doi.org/10.1051/0004-6361/201118748
---------- VANCOUVER ----------
Gulisano, A.M., Démoulin, P., Dasso, S., Rodriguez, L. Expansion of magnetic clouds in the outer heliosphere. Astron. Astrophys. 2012;543.
http://dx.doi.org/10.1051/0004-6361/201118748