Abstract
Polarization properties of solar and stellar radio emission require, in some cases, emission below the third or fourth coronal electron gyro level, ω < 3,ω_c; 4, ω_c. In the context of plasma radiation, the source parameters should be such that the ‘intermediate magnetic field condition’ 1 < ω 2p /ω 2c < 3 is satisfied. Supposing this condition, we investigate the generation of electrostatic waves in a ‘warm’ background plasma with a high-energy component of magnetically trapped electrons. We invoke the conversion of upper-hybrid waves and Bernstein waves into electromagnetic radiation as being responsible for intense radio emission from a coronal magnetic loop. Moreover, ‘odd-half’ harmonic emissions in the solar radio spectrum as well as the o-mode polarization at the second harmonic of the plasma frequency are natural consequence of this proposed model.
Similar content being viewed by others
References
Benz, A. O.: 1985, Solar Phys. 96, 357.
Benz, A. O.: 1986, Solar Phys. 104, 99.
Benz, A. O., Csillaghy, A., and Aschwanden, M.: 1996, Astron. Astrophys. 309, 291.
Benz, A. O., and Pianezzi, P.: 1997, Astron. Astrophys., in press.
Hildebrandt, J. and Krüger A.: 1994, in G. Belvedere et al.(eds.), Proc. 7th European Meeting on Solar Physics, Catania Obs. Publ., p. 181.
Karpman. V. I., Alekhin, Yu. K., Borisov, N. D., and Ryabova, N. A.: 1975, Plasma Phys. 17, 361.
Krucker S. and Benz A. O.: 1994, Astron. Astrophys. 285, 1038.
White, S. M. and Franciosini, E.: 1995, Astrophys. J. 444, 342.
Willes, A. J. and Robinson, P. A.: 1996, Astrophys. J. 467, 465.
Zaitsev, V. V. and Stepanov, A. V.: 1983, Solar Phys. 88, 297.
Zheleznyakov, V. V. and Zlotnik, E. Ya.: 1975, Solar Phys. 43, 431.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Stepanov, A.V., Kliem, B., Krüger, A. et al. Electrostatic Wave Instability and Plasma Radiation from Coronal Loops. Solar Physics 176, 147–152 (1997). https://doi.org/10.1023/A:1004949529063
Issue Date:
DOI: https://doi.org/10.1023/A:1004949529063