首页|Wavelet Cleaning of Solar Dynamic Radio Spectrograms
Wavelet Cleaning of Solar Dynamic Radio Spectrograms
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By applying the state-of-the-art mathematical apparatus, the wavelet transformation, we explore the possibility of a dynamic cleaning of raw data obtained with the Chinese solar radio spectrographs over a wide wavelength range (from 0.7 to 7.6 GHz). We consider the problem of eliminating the interference caused by combination rates of data sampling (10-20ms), and the low-frequency interference (4-30 s) caused by the receiving equipment changing its characteristics with time. It is shown that the best choice to reconstruct a signal suffering from amplitude, frequency and phase instabilities, is by means of wavelet transformation at both high and low frequencies. We analysed observational data which contained interferences of nonsolar origin such as instrumental effects and other man-made signals. A subsequent comparison of the reference data obtained with the acoustooptical receiver of the Siberian Solar Radio Telescope (SSRT) with the "cleaned"spectra confirms the correctness of this approach.
Sun: radio radiation - methods: data analysis
Robert A.Sych、Yi-Hua Yan
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National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
Institute of Solar-Terrestrial Physics, Russian Academy of Sciences, Irkutsk 664033, Russia
Russian Foundation for Basic ResearchFederal program“Astronomy”国家自然科学基金Mimistry of Science and Technology of China
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NSTL
维普
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