Journal ArticleDOI
A broadband spectrometer for decimeter and microwave radio bursts
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TLDR
In this article, a 1.2 GHz radio-spectrometer with high temporal and spectral resolution was proposed for the detection of solar microwave bursts with high resolution in time and in frequency in decimeter and microwave wavebands.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.read more
Citations
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Journal ArticleDOI
New solar broadband radio spectrometer (SBRS) in China
Qijun Fu,Huirong Ji,Zihai Qin,Zhi-Cai Xu,Zhiguo Xia,Hongao Wu,Yuying Liu,Yihua Yan,Guangli Huang,Zhijun Chen,Zhenyu Jin,Qi-jun Yao,Congling Cheng,Fu-Ying Xu,Min Wang,Libei Pei,Shan-huai Chen,Guo Yang,Chenming Tan,Suobiao Shi +19 more
TL;DR: In this article, the authors proposed a new radio spectrometer, Solar Broadband Radio Spectrometer (SBRS) with characteristics of high time resolution, high-frequency resolution and high sensitivity, and wide frequency coverage in the microwave region.
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The Magnetic Rope Structure and Associated Energetic Processes in the 2000 July 14 Solar Flare
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Microwave quasi-periodic pulsations in multi-timescales associated with a solar flare/cme event
TL;DR: In this paper, microwave observations of quasi-periodic pulsations (QPPs) in multi-timescales at the SBRS/Huairou on 2006 December 13 are confirmed to be associated with an X3.4 flare/coronal mass ejection (CME) event.
Journal ArticleDOI
A superfine structure in solar microwave bursts
G. P. Chernov,Yihua Yan,Qijun Fu +2 more
TL;DR: In this paper, the authors have observed in the microwave range (with the radio spectrometer of the Huairu station (Beijing, NAOC) around 3 GHz) the structure of solar radio bursts called zebra patterns and bursts (seen drifting on the frequency stripes in emission and in absorption on the background burst continuum emission).
Journal ArticleDOI
Recent data on zebra patterns
TL;DR: In this article, a comparative analysis of two recent solar radio outbursts around 3 GHz with zebra structures and fiber bursts in their dynamical radio spectra is carried out using all available ground-based and satellite data (SOHO, TRACE, RHESSI).
References
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Journal ArticleDOI
Electron beams in the low corona
TL;DR: In this article, high-resolution spectrograms of solar fast-drift bursts in the 6.2-8.4 GHz range are presented, which have similar characteristics as metric and decimetric type III bursts: rise and decay in a few thermal collision times, total bandwidth ≳3% of the center frequency, low polarization, drift rate of the order of center frequency per second, and flare association.
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Journal ArticleDOI
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Journal ArticleDOI
MHD oscillations in radio spike radiation observed on May 16, 1981
TL;DR: In this paper, quasi-periodic oscillation characteristics of 1.4-1.6 s in the typical microwave outburst observed on May 16, 1981 were analyzed in terms of MHD waves propagating inside and outside a loop.