Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pbeio..38...78x&link_type=abstract
Astrophysics Reports. Publications of the Beijing Astronomical Observatory, No. 38, p. 78 - 82 (2002). In: Proceedings of the Ni
Astronomy and Astrophysics
Astrophysics
Solar Radio Bursts, Wavelets
Scientific paper
Many radio burst events have been observed with the help of Solar Radio Broadband Spectrometers (from 0.7 GHz to 7.6 GHz) in National Astronomical Observatories, Chinese Academy of Science. As a special case, a 5.2 - 7.6 GHz solar spectrum, which was obtained in the NOAA 9677 active region for the Bastille-Day (July 14, 2000) flare during 10:10 - 11:00 is presented. In our paper, for the purpose of determining the fine structures and delete interferences in solar radio spectra, we introduce a data processing method with the combination of wavelet transform and channel-modification. First, the original data were divided by each mean value at each channel, which can clean a large part of the horizontal branch of grid-texture on the spectrum. Second, wavelet transform was applied to the result by the first step. And then the signal was reconstructed from its wavelet transform coefficients. As a results, we can clean grid-texture and delete interferences imposed on spectra, and also enhance the display of spectrum.
Chen Zhi-Jun
Liu Yuying
Song Guoxiang
Xu Long
Yan Yihua
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