On the relation between the peak frequency and the corresponding rise time of solar microwave impulsive bursts and the height dependence of magnetic fields

In the present paper we report the results of a correlation analysis for 57 microwave impulsive bursts observed at six frequencies in which we have obtained a regression line between the peak frequency and the corresponding rise time of microwave impulsive bursts: f sub(p) identical with 1.517 x 10...

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Bibliographic Details
Published in:Solar physics 1990-12, Vol.130 (1-2), p.361-368
Main Authors: ZHAO REN-YANG, MAGUN, A, SCHANDA, E
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Flares, bursts, and related phenomena
Solar physics
Solar system
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Summary:In the present paper we report the results of a correlation analysis for 57 microwave impulsive bursts observed at six frequencies in which we have obtained a regression line between the peak frequency and the corresponding rise time of microwave impulsive bursts: f sub(p) identical with 1.517 x 10 super(1) super(0) t sub(r) super(-) super(0) super(.) super(1) super(4) (with a correlation coefficient of -0.43). This can be explained in the frame of a thermal model. The magnetic field decrease with height has to be much slower than in a dipole field in order to explain the weak dependence of f sub(p) on t sub(r) . This decrease of magnetic field with height in burst sources is based on the relationship between f sub(p) and t sub(r) found by assuming a thermal flare model with a collisionless conduction front.
ISSN:0038-0938
1573-093X
DOI:10.1007/BF00156799