Artículo

van Driel-Gesztelyi, L.; Démoulin, P.; Mandrini, C.H. "Observations of magnetic helicity" (2003) Advances in Space Research. 32(10):1855-1866
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Abstract:

The first observational signature of magnetic helicity in the solar atmosphere (sunspot whirls) was discovered 77 years ago. Since then, the existence of a cycle-invariant hemispheric helicity pattern has been firmly established through current helicity and morphological studies. During the last years, attempts were made to estimate/measure magnetic helicity from solar and interplanetary observations. Magnetic helicity (unlike current helicity) is one of the few global quantities that is conserved even in resistive magnetohydrodynamics (MHD) on a timescale less than the global diffusion timescale, thus magnetic helicity studies make it possible to trace helicity as it emerges from the sub-photospheric layers to the corona and then is ejected via coronal mass ejections (CMEs) into the interplanetary space reaching the Earth in a magnetic cloud. We give an overview of observational studies on the relative importance of different sources of magnetic helicity, i.e. whether photospheric plasma motions (photospheric differential rotation and localized shearing motions) or the twist of the emerging flux tubes created under the photosphere (presumably by the radial shear in the differential rotation in the tachocline) is the dominant helicity source. We examine the sources of errors present in these early results and try to judge how realistic they are. © 2003 COSPAR. Published by Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Observations of magnetic helicity
Autor:van Driel-Gesztelyi, L.; Démoulin, P.; Mandrini, C.H.
Filiación:Centre for Plasma Astrophyiscs, K.U. Leuven, Celestijnenlaan 200B, Heverlee 200B, Belgium
Mullard Space Science Laboratory, Univ. of College London, London, United Kingdom
Observatoire de Paris, LESIA, FRE 2461 CNRS, Meudon Cedex, France
Konkoly Observatory, Hungarian Academy of Sciences, Budapest, Hungary
Inst. Astronomia/Fisica del Espacio, IAFE, Argentina
Palabras clave:Clouds; Earth atmosphere; Magnetohydrodynamics; Magnetic helicity; Space research; magnetic field
Año:2003
Volumen:32
Número:10
Página de inicio:1855
Página de fin:1866
DOI: http://dx.doi.org/10.1016/S0273-1177(03)90619-3
Título revista:Advances in Space Research
Título revista abreviado:Adv. Space Res.
ISSN:02731177
CODEN:ASRSD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v32_n10_p1855_vanDrielGesztelyi

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Citas:

---------- APA ----------
van Driel-Gesztelyi, L., Démoulin, P. & Mandrini, C.H. (2003) . Observations of magnetic helicity. Advances in Space Research, 32(10), 1855-1866.
http://dx.doi.org/10.1016/S0273-1177(03)90619-3
---------- CHICAGO ----------
van Driel-Gesztelyi, L., Démoulin, P., Mandrini, C.H. "Observations of magnetic helicity" . Advances in Space Research 32, no. 10 (2003) : 1855-1866.
http://dx.doi.org/10.1016/S0273-1177(03)90619-3
---------- MLA ----------
van Driel-Gesztelyi, L., Démoulin, P., Mandrini, C.H. "Observations of magnetic helicity" . Advances in Space Research, vol. 32, no. 10, 2003, pp. 1855-1866.
http://dx.doi.org/10.1016/S0273-1177(03)90619-3
---------- VANCOUVER ----------
van Driel-Gesztelyi, L., Démoulin, P., Mandrini, C.H. Observations of magnetic helicity. Adv. Space Res. 2003;32(10):1855-1866.
http://dx.doi.org/10.1016/S0273-1177(03)90619-3