Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..753h&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
A group expressions are derived for calculating the coronal magnetic field the density of non-thermal electrons and the propagation angle from the spectral index brightness temperature turnover frequency and the frequency for a given microwave burst on the basis of Dulk&Marsh's approximation (1982). The calculations are summarized as follow. 1) When the spectral index smaller than 4.0 the magnetic field increases with increasing the brightness temperature and the frequency with decreasing the turnover frequency. 2) When the spectral index larger than 4.0 and smaller than 6.5 the relationship is just reversed. 3) When the spectral index larger than 6.5 the relationship is reversed again. 4) The magnetic field is more sensitive to the turnover frequency than that to the brightness temperature and the frequency. 5) The relationship between the non-thermal density versus the brightness temperature the turnover frequency and the frequency does not change with the spectral index. Two impulsive microwave bursts on June 3 and 10 2000 are selected from the data of Owens-Valley Radio Observatory. The fast variation of turnover frequency is different from the earlier conclusion as a remarkable constant which is consistent with the thermal and non-thermal gyro-synchrotron models.
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