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

✍ Scribed by Zhao Ren-Yang; Andreas Magun; Erwin Schanda

• Publisher: Springer
• Year: 1990
• Tongue: English
• Weight: 377 KB
• Volume: 130
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00156799

✦ Synopsis

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: fp~ 1.517 x 101~ TM (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 offp on tr. This decrease of magnetic field with height in burst sources is based on the relationship betweenfp and t r found by assuming a thermal flare model with a collisionless conduction front.