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Démoulin, P.; Van Driel-Gesztelyi, L.; Mandrini, C.H.; Klimchuk, J.A.; Harra, L. "The long-term evolution of AR 7978: Testing coronal heating models" (2003) Astrophysical Journal. 586(1 I):592-605
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Abstract:

We derive the dependence of the mean coronal heating rate on the magnetic flux density. Our results are based on a previous study of the plasma parameters and the magnetic flux density (B̄) in the active region NOAA 7978 from its birth to its decay, throughout five solar rotations using the Solar and Heliospheric Observatory Michelson Doppler Imager, Yohkoh Soft X-Ray Telescope (SXT), and Yohkoh Bragg Crystal Spectrometer (BCS). We use the scaling laws of coronal loops in thermal equilibrium to derive four observational estimates of the scaling of the coronal heating with B̄ (two from SXT and two from BCS observations). These results are used to test the validity of coronal heating models. We find that models based on the dissipation of stressed, current-carrying magnetic fields are in better agreement with the observations than models that attribute coronal heating to the dissipation of MHD waves injected at the base of the corona. This confirms, with smaller error bars, previous results obtained for individual coronal loops, as well as for the global coronal emission of the Sun and cool stars. Taking into account that the photospheric field is concentrated in thin magnetic flux tubes, both SXT and BCS data are in best agreement with models invoking a stochastic buildup of energy, current layers, and MHD turbulence.

Registro:

Documento: Artículo
Título:The long-term evolution of AR 7978: Testing coronal heating models
Autor:Démoulin, P.; Van Driel-Gesztelyi, L.; Mandrini, C.H.; Klimchuk, J.A.; Harra, L.
Filiación:Observatoire de Paris, LESIA, FRE 2461 (CNRS), F-92195 Meudon Principal Cedex, France
Centre for Plasma Astrophysics, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey RH5 6NT, United Kingdom
Konkoly Observatory, P.O. Box 67, H-l525 Budapest, Hungary
Inst. de Astron. y Fis. del Espacio, IAFE, Casilla de Correos 67, Sucursal 28, 1428 Buenos Aires, Argentina
Carrera del Investigador Cientifico, CONICET, Buenos Aires, Argentina
Naval Research Laboratory, Code 7675, Washington, DC 20375-5352, United States
Palabras clave:Magnetic fields; Sun: corona; Sun: magnetic fields; Sun: X-rays, gamma rays
Año:2003
Volumen:586
Número:1 I
Página de inicio:592
Página de fin:605
DOI: http://dx.doi.org/10.1086/367634
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v586_n1I_p592_Demoulin

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Citas:

---------- APA ----------
Démoulin, P., Van Driel-Gesztelyi, L., Mandrini, C.H., Klimchuk, J.A. & Harra, L. (2003) . The long-term evolution of AR 7978: Testing coronal heating models. Astrophysical Journal, 586(1 I), 592-605.
http://dx.doi.org/10.1086/367634
---------- CHICAGO ----------
Démoulin, P., Van Driel-Gesztelyi, L., Mandrini, C.H., Klimchuk, J.A., Harra, L. "The long-term evolution of AR 7978: Testing coronal heating models" . Astrophysical Journal 586, no. 1 I (2003) : 592-605.
http://dx.doi.org/10.1086/367634
---------- MLA ----------
Démoulin, P., Van Driel-Gesztelyi, L., Mandrini, C.H., Klimchuk, J.A., Harra, L. "The long-term evolution of AR 7978: Testing coronal heating models" . Astrophysical Journal, vol. 586, no. 1 I, 2003, pp. 592-605.
http://dx.doi.org/10.1086/367634
---------- VANCOUVER ----------
Démoulin, P., Van Driel-Gesztelyi, L., Mandrini, C.H., Klimchuk, J.A., Harra, L. The long-term evolution of AR 7978: Testing coronal heating models. Astrophys. J. 2003;586(1 I):592-605.
http://dx.doi.org/10.1086/367634