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Abstract:

We analyze the evolution of the fluxes observed in X-rays and correlate them with the magnetic flux density in active region (AR) NOAA 7978 from its birth throughout its decay, for five solar rotations. We use Solar and Heliospheric Observatory Michelson Doppler Imager (MDI) data, together with Yohkoh Soft X-Ray Telescope (SXT) and Yohkoh Bragg Crystal Spectrometer (BCS) data, to determine the global evolution of the temperature and the emission measure of the coronal plasma at times when no significant brightenings were observed. We show that the mean X-ray flux and derived parameters, temperature and emission measure (together with other quantities deduced from them, such as the density and the pressure), of the plasma in the AR follow power-law relationships with the mean magnetic flux density (B̄). The exponents (b) of these power-law functions (aB̄b) are derived using two different statistical methods, a classical least-squares method in log-log plots and a nonparametric method, which takes into account the fact that errors in the data may not be normally distributed. Both methods give similar exponents, within error bars, for the mean temperature and for both instruments (SXT and BCS); in particular, b stays in the range [0.27, 0.31] and [0.24, 0.57] for full-resolution SXT images and BCS data, respectively. For the emission measure, the exponent b lies in the range [0.85, 1.35] and [0.45, 1.96] for SXT and BCS, respectively. The determination of such power-law relations, when combined with the results from coronal heating models, can provide us with powerful tools for determining the mechanism responsible for the existence of the high-temperature corona.

Registro:

Documento: Artículo
Título:The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field
Autor:Van Driel-Gesztelyi, L.; Démoulin, P.; Mandrini, C.H.; Harra, L.; Klimchuk, J.A.
Filiación:Centre for Plasma Astrophysics, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
Observatoire de Paris, LESIA, FRE 2461 (CNRS), F-92195 Meudón Prin. Cedex, France
Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey RH5 6NT, United Kingdom
Konkoly Observatory, P.O. Box 67, H-1525 Budapest, Hungary
Carrera del Investigador Cientifico, CONICET, Buenos Aires, Argentina
Inst. de Astron. y Fis. del Espacio, IAFE, Casilla de Correos 67, Sucursal 28, 1428 Buenos Aires, Argentina
Naval Research Laboratory, Code 7675, Washington, DC 20375-5352, United States
Palabras clave:Sun: corona; Sun: magnetic fields; Sun: X-rays, gamma rays
Año:2003
Volumen:586
Número:1 I
Página de inicio:579
Página de fin:591
DOI: http://dx.doi.org/10.1086/367633
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v586_n1I_p579_VanDrielGesztelyi

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Citas:

---------- APA ----------
Van Driel-Gesztelyi, L., Démoulin, P., Mandrini, C.H., Harra, L. & Klimchuk, J.A. (2003) . The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field. Astrophysical Journal, 586(1 I), 579-591.
http://dx.doi.org/10.1086/367633
---------- CHICAGO ----------
Van Driel-Gesztelyi, L., Démoulin, P., Mandrini, C.H., Harra, L., Klimchuk, J.A. "The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field" . Astrophysical Journal 586, no. 1 I (2003) : 579-591.
http://dx.doi.org/10.1086/367633
---------- MLA ----------
Van Driel-Gesztelyi, L., Démoulin, P., Mandrini, C.H., Harra, L., Klimchuk, J.A. "The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field" . Astrophysical Journal, vol. 586, no. 1 I, 2003, pp. 579-591.
http://dx.doi.org/10.1086/367633
---------- VANCOUVER ----------
Van Driel-Gesztelyi, L., Démoulin, P., Mandrini, C.H., Harra, L., Klimchuk, J.A. The long-term evolution of AR 7978: The scalings of the coronal plasma parameters with the mean photospheric magnetic field. Astrophys. J. 2003;586(1 I):579-591.
http://dx.doi.org/10.1086/367633