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Abstract:

We describe dynamical features and evolutionary characteristics of brightening coronal loops. We describe intensity variations, both in space and time, along a coarse grain loop structure, confirming high speed velocity scenarios. We apply the method to TRACE space-born images that show a compound of several magnetic threads. MICA ground-based images display a unique non-resolved loop structure. We confirm that a coherent behavior of the intensity along neighboring magnetic tubes occurs, i.e. we obtain a similar pattern from both telescopes: each has two branches, suggesting the sliding down of plasma in both directions from a given position on the loop structure. The apparent sliding down occurs in approximately 12 min. After the first appearance, TRACE registers two reiterations of the phenomenon suggesting a wave-based explanation. The feasibility of wave-based and flow-based models is analyzed. In either case, in order to explain the coherent coronal behavior the scenario of apparently non-interacting coronal threads requires theoretical explanations that consider uniform chromospheric conditions covering the footpoints of all the related magnetic tubes. We suggest a characteristic longitude of coherence. © ESO 2005.

Registro:

Documento: Artículo
Título:Characterization of intensity and spatial variations along coronal loops: II. A TRACE case study
Autor:Borgazzi, A.; Costa, A.
Filiación:Instituto de Astronomía y Física del Espacio, CONICET, Argentina
Palabras clave:Instabilities; Sun: corona; Sun: magnetic fields; Waves; Magnetic fields; Optical telescopes; Space research; Velocity measurement; Waves; Coronal loop structure; Instabilities; Sun: corona; Sun: magnetic fields; Solar system
Año:2005
Volumen:441
Número:1
Página de inicio:327
Página de fin:335
DOI: http://dx.doi.org/10.1051/0004-6361:20042293
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v441_n1_p327_Borgazzi

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Citas:

---------- APA ----------
Borgazzi, A. & Costa, A. (2005) . Characterization of intensity and spatial variations along coronal loops: II. A TRACE case study. Astronomy and Astrophysics, 441(1), 327-335.
http://dx.doi.org/10.1051/0004-6361:20042293
---------- CHICAGO ----------
Borgazzi, A., Costa, A. "Characterization of intensity and spatial variations along coronal loops: II. A TRACE case study" . Astronomy and Astrophysics 441, no. 1 (2005) : 327-335.
http://dx.doi.org/10.1051/0004-6361:20042293
---------- MLA ----------
Borgazzi, A., Costa, A. "Characterization of intensity and spatial variations along coronal loops: II. A TRACE case study" . Astronomy and Astrophysics, vol. 441, no. 1, 2005, pp. 327-335.
http://dx.doi.org/10.1051/0004-6361:20042293
---------- VANCOUVER ----------
Borgazzi, A., Costa, A. Characterization of intensity and spatial variations along coronal loops: II. A TRACE case study. Astron. Astrophys. 2005;441(1):327-335.
http://dx.doi.org/10.1051/0004-6361:20042293