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Abstract:

We study the temporal evolution of coronal loops using data from the Solar X-Ray Imager (SXI) on board the Geosynchronous Operational Environmental Satellite 12 (GOES-12). This instrument provides continuous soft X-ray observations of the solar corona at a high temporal cadence permitting detailed study of the full lifetime of each of several coronal loops. The observed light curves suggest three evolutionary phases: rise, main, and decay. The durations and characteristic timescales of these phases [I/(dI/dt), where I is the loop intensity] are much longer than a cooling time and indicate that the loop-averaged heating rate increases slowly, reaches a maintenance level, and then decreases slowly. This suggests that a single heating mechanism operates for the entire lifetime of the loop. For monolithic (uniformly filled) loops, the loop-averaged heating rate is the intrinsic energy release rate of the heating mechanism. For loops that are bundles of impulsively heated strands, it relates to the frequency of occurrence of individual heating events, or nanoflares. We show that the timescale of the loop-averaged heating rate is proportional to the timescale of the observed intensity variation, with a constant of proportionality of approximately 1.5 for monolithic loops and 1.0 for multistranded loops. The ratios of the radiative to conductive cooling times in the loops are some-what less than 1, putting them intermediate between the values measured previously for hotter and cooler loops. This provides further support for a trend suggesting that all loops are heated in a similar way. © 2007. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:The temporal evolution of coronal loops observed by GOES SXI
Autor:López Fuentes, M.C.; Klimchuk, J.A.; Mandrini, C.H.
Filiación:Naval Research Laboratory, Washington, DC, United States
Instituto de Astronomía y Física del Espacio, CONICET-UBA, Buenos Aires, Argentina
Carrera del Investigador Cientifico, Consejo Nacional de Investigaciones Cientificas y Técnicas, Argentina
Palabras clave:Sun: corona; Sun: flares; Sun: magnetic fields; Sun: X-rays, gamma rays
Año:2007
Volumen:657
Número:2 I
Página de inicio:1127
Página de fin:1136
DOI: http://dx.doi.org/10.1086/510662
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v657_n2I_p1127_LopezFuentes

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Citas:

---------- APA ----------
López Fuentes, M.C., Klimchuk, J.A. & Mandrini, C.H. (2007) . The temporal evolution of coronal loops observed by GOES SXI. Astrophysical Journal, 657(2 I), 1127-1136.
http://dx.doi.org/10.1086/510662
---------- CHICAGO ----------
López Fuentes, M.C., Klimchuk, J.A., Mandrini, C.H. "The temporal evolution of coronal loops observed by GOES SXI" . Astrophysical Journal 657, no. 2 I (2007) : 1127-1136.
http://dx.doi.org/10.1086/510662
---------- MLA ----------
López Fuentes, M.C., Klimchuk, J.A., Mandrini, C.H. "The temporal evolution of coronal loops observed by GOES SXI" . Astrophysical Journal, vol. 657, no. 2 I, 2007, pp. 1127-1136.
http://dx.doi.org/10.1086/510662
---------- VANCOUVER ----------
López Fuentes, M.C., Klimchuk, J.A., Mandrini, C.H. The temporal evolution of coronal loops observed by GOES SXI. Astrophys. J. 2007;657(2 I):1127-1136.
http://dx.doi.org/10.1086/510662