Abstract
Observations of solar microwave bursts with high temporal and spectral resolution have shown interesting fine structures (FSs) of short duration and small bandwidth which are usually superimposed on the smooth continuum. These FSs are very intense (up to 1015 K) and show sometimes a high degree of circular polarization (up to 100%). They are believed to be generated by electron cyclotron maser emission (ECME) in magnetic loops. Another type are the microwave type III bursts, which are drifting microwave FSs, and are probably the signatures of travelling electron beams in the solar atmosphere. The exact emission mechanisms for these phenomena, in particular the source configuration, the plasma parameters and the distribution of radiating electrons are not clear. For a detailed study of these problems new observations of intensity and polarization with high resolution in time and in frequency in decimeter and microwave wavebands are essential. In order to investigate these features in greater detail, spectrometers with high temporal and spectral resolution are being developed by the solar radio astronomy community of China (Beijing Astronomical Observatory (BAO), Purple Mountain Observatory (PMO), Yunnan Astronomical Observatory (YAO), and Nanjing University (NJU)). The frequency range from 0.7 to about 12 GHz is covered by about five spectrometers in frequency ranges of 0.7–1.4 GHz, 1–2 GHz, 2.4–3.6 GHz, 4.9–7.3 GHz, and 8–12 GHz, respectively. The radiospectrometers will form a combined type of swept-frequency and multi-channel receivers. The main characteristics of the solar radio spectrometers are: frequency resolution: 1–10 MHz; temporal resolution: 1–10 ms; sensitivity: better than 2% of the quiet-Sun level. We pay special attention to the sensitivity and the accuracy of polarization. Now, the 1–2 GHz radiospectrometer is being set up. The full system will be set up in 3–4 years.
Similar content being viewed by others
References
Aschwanden, M., Benz, A. O., and Schwartz, R.: 1993,Astrophys. J. 417, 790.
Benz, A. O., Magun, A., Stehling, W., and Su, H.: 1992,Solar Phys. 141, 335.
Fu, Q.: 1992, in W. Hu, B. Zhang, and D. Lu (eds.),Advances in Solar-Terrestrial Science of China, Science Press, p. 38.
Fu, Q., Gong, Y, Jin, S., and Zhao, R.: 1990,Solar Phys. 130, 161.
Fu, Q., Li, C., Gong, Y., Li, W., Zhao, B., Shang, Q., Lu, S., and Hu, H.: 1993a,Solar Phys. 143, 317.
Fu, Q., Hu, C., Zhao, B., Jin, S., Yurovsky, Yu., Stepanov, A., Magun, A., and Schanda, E.: 1993b,Proc. IAU Colloq. 141,ASP Conference Series 46, 355.
Fu, Q., Liu, Y., and Li, C.: 1994,Proc. Kofu Symposium, NRO Report No. 360, p. 421.
Li, C., Fu, Q., and Li, H.: 1991,Solar Phys. 131, 337.
Qin, Z. and Huang, G.: 1994,Astrophys. Space Sci. 218, 213.
Stähli, M. and Benz, A. O.: 1987,Astron. Astrophys. 175, 271.
Wang, D. and Li, D.: 1991,Solar Phys. 135, 393.
Xia, Z., Chen, J., Zheng, X., and Ma, Y.: 1993,Proc. IAU Colloq. 141,ASP Conference Series 46, 283.
Xie, R., Song, Q., Wang, M., and Chen, G.: 1994,Solar Phys. 155, 113.
Zhao, R., Jin, S., and Fu, Q.: 1990,Solar Phys. 130, 151.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Fu, Q., Qin, Z., Ji, H. et al. A broadband spectrometer for decimeter and microwave radio bursts. Sol Phys 160, 97–103 (1995). https://doi.org/10.1007/BF00679098
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00679098