Artículo
Cristiani, G.; Giménez de Castro, C.G.; Mandrini, C.H.; Machado, M.E.; Rovira, M.G. "Asymmetric precipitation in a coronal loop as explanation of a singular observed spectrum" (2009) Advances in Space Research. 44(11):1314-1320
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Abstract:
Almost 10 years of solar submillimeter observations have shown new aspects of solar activity, such as the presence of rapid solar spikes associated with the launch of coronal mass ejections and an increasing submillimeter spectral component in flares. We analyse the singular microwave-submillimeter spectrum of an M class solar flare on 20 December, 2002. Flux density observations measured by Sun patrol telescopes and the Solar Submillimeter Telescope are used to build the radio spectrum, which is fitted using Ramaty's code. At submillimeter frequencies the spectrum shows a component different from the microwave classical burst. The fitting is achieved proposing two homogeneous sources of emission. This theoretical fitting is in agreement with differential precipitation through a magnetically asymmetric loop or set of loops. From a coronal magnetic field model we infer an asymmetric magnetic structure at the flare location. The model proposed to quantify the differential precipitation rates due to the asymmetry results in a total precipitation ratio Q2 / Q1 ≈ 104 s(-) 105, where Q1 (Q2) represents the total precipitation in the loop foot with the high (low) magnetic field intensity. This ratio agrees with the electron total number ratio of the two sources proposed to fit the radio spectrum. © 2009 COSPAR.
Registro:
| Documento: | Artículo |
| Título: | Asymmetric precipitation in a coronal loop as explanation of a singular observed spectrum |
| Autor: | Cristiani, G.; Giménez de Castro, C.G.; Mandrini, C.H.; Machado, M.E.; Rovira, M.G. |
| Filiación: | Instituto de Astronomía y Física del Espacio, CONICET-UBA, CC 67, Suc. 28, 1428 Buenos Aires, Argentina Centro de Rádio Astronomia e Astrofísica Mackenzie, Escola de Engenharia, R. da Consolação 896, 01302-907 São Paulo, SP, Brazil Comisión Nacional de Actividades Espaciales, Av. Paseo Colón 751, 1063 Buenos Aires, Argentina |
| Palabras clave: | Sun: flares; Sun: radio radiation; Magnetic fields; Radio communication; Solar energy; Coronal magnetic fields; Coronal mass ejection; Magnetic-field intensity; Precipitation rates; Spectral components; Submillimeter spectra; Sun: flares; Sun: radio radiation; Telescopes |
| Año: | 2009 |
| Volumen: | 44 |
| Número: | 11 |
| Página de inicio: | 1314 |
| Página de fin: | 1320 |
| DOI: | http://dx.doi.org/10.1016/j.asr.2009.06.012 |
| Título revista: | Advances in Space Research |
| Título revista abreviado: | Adv. Space Res. |
| ISSN: | 02731177 |
| CODEN: | ASRSD |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v44_n11_p1314_Cristiani |
Referencias:
- Aschwanden, M.J., Deconvolution of directly precipitating and trap-precipitating electrons in solar flare hard X-rays. I. Method and tests (1998) AphJ, 502, pp. 455-467
- Aschwanden, M.J., Bynum, R.M., Kosugi, T., Hudson, H.S., Schwartz, R.A., Electron trapping times and trap densities in solar flare loops measured with Compton and YOHKOH (1997) Astrophys. J., 487, pp. 936-955
- (1993) Plasma Astrophysics: Kinetic Processes in Solar and Stellar Coronae, 184. , Benz, A.O, Ed, Astrophysics and Space Science Library
- Cristiani, G., Giménez de Castro, C.G., Mandrini, C.H., Machado, M.E., Silva, I.D.B.E., Kaufmann, P., Rovira, M.G., A solar burst with a spectral component observed only above 100 GHz during an M class flare (2008) A&A, 492, pp. 215-222
- Cristiani, G., Martinez, G., Mandrini, C.H., Giménez de Castro, C.G., da Silva, C.W., Rovira, M.G., Kaufmann, P., Spatial characterization of a flare using radio observations and magnetic field topology (2007) Sol. Phys., 240, pp. 271-281
- da Silva, A., Share, G., Murphy, R., Costa, J., Giménez de Castro, C., Raulin, J.-P., Kaufmann, P., Evidence that synchrotron emission from nonthermal electrons produces the increasing submillimeter spectral component in solar flares (2007) Sol. Phys., 245, pp. 311-326
- Fletcher, L., On the generation of loop-top impulsive hard X-ray sources (1995) A&A, 303, pp. L9-L12
- Gary, D.E., Hurford, G.J., Multifrequency observations of a solar microwave burst with two-dimensional spatial resolution (1990) ApJ, 361, pp. 290-299
- Herrmann, R., Magun, A., Kaufmann, P., Correia, E., Costa, J.E.R., Machado, M.E., Fishman, G.J., Evidence for highly inhomogeneous mm-wave sources during the impulsive flare of May 9, 1991 (1997) A&A, 317, pp. 232-243
- Huang, G., Haisheng, J., Radio, hard X-ray, EUV and optical study of September 9, 2002 solar flare (2006) Astrophys. Space Sci., 301, pp. 65-71
- Kaufmann, P., Costa, J.E.R., Correia, E., Giménez de Castro, C.G., Raulin, J.-P., Silva, A.V.R. Multiple high energy injections at the origin of solar flares, in: Ramaty, R., Mandzhavidze, N. (Eds.), ASP Conf. Ser. 206: High Energy Solar Physics Workshop - Anticipating Hessi, pp. 318-328, 2000; Kaufmann, P., Raulin, J.P., de Castro, C.G.G., Levato, H., Gary, D.E., Costa, J.E.R., Marun, A., Correia, E., A new solar burst spectral component emitting only in the terahertz range (2004) ApJL, 603, pp. L121-L124
- Kaufmann, P., Trottet, G., Giménez de Castro, C., Raulin, J., Gary, D., Fernandez, G., Godoy, R., Levato, H., Marun, A., Pereyra, P. Solar burst submillimeter wave emission components associated to microwaves, Uv, X- and γ-rays continuum in time and space, in: American Astronomical Society Meeting Abstracts, 210. American Astronomical Society Meeting Abstracts, pp. 93-93, 2007; Lüthi, T., Magun, A., Miller, M., First observation of a solar X-class flare in the submillimeter range with KOSMA (2004) A&A, 415, pp. 1123-1132
- Masuda, S., (1994) Hard X-ray Sources and the Primary Energy Release Site in Solar Flares, , Ph.D. Thesis, Dissertation, Yohkoh HXT Group, NAO, Mitaka, Tokyo
- Melrose, D.B., White, S.M., Effect of asymmetry on a trap model for solar hard X-ray bursts (1979) Proc. Astron. Soc. Austr., 3, pp. 369-371
- Melrose, D.B., White, S.M., Precipitation from an asymmetric magnetic flux tube (1981) J. Geophys. Res., 86, pp. 2183-2190
- Metcalf, T.R., Alexander, D., Coronal trapping of energetic flare particles: Yohkoh/HXT observations (1999) ApJ, 522, pp. 1108-1116
- Schmidt, G., (1979) Physics of High Temperature Plasmas. second ed., , Academic Press, Inc., New York
- Sivukhin, D.V., Coulomb collisions in a fully ionized plasma (1966) Rev. Plasma Phys., 4, pp. 93-241
- Spitzer, L., (1956) Physics of Fully Ionized Gases, , Interscience Publishers, New York
- Stähli, M., Gary, D.E., Hurford, G.J., The secondary spectral component of solar microwave bursts (1990) Sol. Phys., 125, pp. 343-357
- Trubnikov, B.A., Particle interactions in a fully ionized plasma (1965) Rev. Plasma Phys., 1, pp. 105-200
Citas:
---------- APA ----------
Cristiani, G., Giménez de Castro, C.G., Mandrini, C.H., Machado, M.E. & Rovira, M.G. (2009) . Asymmetric precipitation in a coronal loop as explanation of a singular observed spectrum. Advances in Space Research, 44(11), 1314-1320.http://dx.doi.org/10.1016/j.asr.2009.06.012
---------- CHICAGO ----------
Cristiani, G., Giménez de Castro, C.G., Mandrini, C.H., Machado, M.E., Rovira, M.G. "Asymmetric precipitation in a coronal loop as explanation of a singular observed spectrum" . Advances in Space Research 44, no. 11 (2009) : 1314-1320.http://dx.doi.org/10.1016/j.asr.2009.06.012
---------- MLA ----------
Cristiani, G., Giménez de Castro, C.G., Mandrini, C.H., Machado, M.E., Rovira, M.G. "Asymmetric precipitation in a coronal loop as explanation of a singular observed spectrum" . Advances in Space Research, vol. 44, no. 11, 2009, pp. 1314-1320.http://dx.doi.org/10.1016/j.asr.2009.06.012
---------- VANCOUVER ----------
Cristiani, G., Giménez de Castro, C.G., Mandrini, C.H., Machado, M.E., Rovira, M.G. Asymmetric precipitation in a coronal loop as explanation of a singular observed spectrum. Adv. Space Res. 2009;44(11):1314-1320.http://dx.doi.org/10.1016/j.asr.2009.06.012
