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Abstract:

We study the chromospheric structure of a small flare, before, during and after the first hard X-ray spike. We construct 5 semiempirical models for different times, which will reproduce the profiles of the Hδ, Ca II K and Si I 3905 lines during the flare evolution. In order to reproduce the intensity and the main characteristics of the line asymmetry, we introduce the velocity fields in the profile calculations. We find that the whole chromosphere undergoes a strong upward motion within 1 s of the maximum of the first hard X-ray spike, when the temperature and the density begin to rapidly increase. This seems the first chromospheric response to the energy deposition and/or release. Only 6 s after the hard X-ray peak, a strong downflow begins in the low chromosphere and its velocity continues to increase even during the cooling phase.

Registro:

Documento: Artículo
Título:Chromospheric models of a solar flare including velocity fields
Autor:Falchi, A.; Mauas, P.J.D.
Filiación:Osservatorio Astrofisico di Arcetri, 50125 Firenze, Italy
Instituto de Astronomía y Física del Espacio, Buenos Aires, Argentina
Palabras clave:Sun: chromosphere; Sun: flares; Cooling; Energy dissipation; Mathematical models; Sun; X rays; Solar flare; Astrophysics
Año:2002
Volumen:387
Número:2
Página de inicio:678
Página de fin:686
DOI: http://dx.doi.org/10.1051/0004-6361:20020454
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_v387_n2_p678_Falchi

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Citas:

---------- APA ----------
Falchi, A. & Mauas, P.J.D. (2002) . Chromospheric models of a solar flare including velocity fields. Astronomy and Astrophysics, 387(2), 678-686.
http://dx.doi.org/10.1051/0004-6361:20020454
---------- CHICAGO ----------
Falchi, A., Mauas, P.J.D. "Chromospheric models of a solar flare including velocity fields" . Astronomy and Astrophysics 387, no. 2 (2002) : 678-686.
http://dx.doi.org/10.1051/0004-6361:20020454
---------- MLA ----------
Falchi, A., Mauas, P.J.D. "Chromospheric models of a solar flare including velocity fields" . Astronomy and Astrophysics, vol. 387, no. 2, 2002, pp. 678-686.
http://dx.doi.org/10.1051/0004-6361:20020454
---------- VANCOUVER ----------
Falchi, A., Mauas, P.J.D. Chromospheric models of a solar flare including velocity fields. Astron. Astrophys. 2002;387(2):678-686.
http://dx.doi.org/10.1051/0004-6361:20020454