Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007chjaa...7..487z&link_type=abstract
Chinese Journal of Astronomy & Astrophysics, Vol. 7, p. 487-495
Astronomy and Astrophysics
Astrophysics
3
Sun: Flare, Sun: Radio Emission, Sun: Magnetic Field
Scientific paper
The gyrosynchrotron spectra are computed in a nonuniform magnetic field case, taking into account the self- and gyroresonance absorption. It is found that the peak frequency νp of the gyrosynchrotron spectrum systematically increases with the increasing photosphere magnetic field strength B0 and increasing viewing angle θ. It is also found for the first time that there are good positive linear correlations between νp and B0, and between logνp and log θ, with linear correlation coefficient 0.99 between νp and B0 and 0.95 between logνp and logθ. We apply the correlations to analyze two burst events observed with OVSA and find that the evolution tendencies of the photosphere magnetic field strength B0 estimated from the above expression are comparable with the observational results of SOHO/MDI. We also give a comparison of the diagnostic results of coronal magnetic field strength in both uniform and nonuniform source models.
Li Jian-Ping
Zhou Ai-Hua
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