Hollow beam distribution of energetic electrons and higher harmonics of electron cyclotron maser

✍ Scribed by Hong Wei Li

• Book ID: 104648899
• Publisher: Springer
• Year: 1986
• Tongue: English
• Weight: 280 KB
• Volume: 104
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00159954

✦ Synopsis

The variations of the growth rates of ECM at first four harmonics in X-, Z-, and O-modes excited by a hollow beam distribution of weakly relativistic electrons with a parameter r -= %/I2 e are presented in this paper. The results show that the second harmonic of ECM in X-mode dominates the instability if ~ < 1, and if 1.2 ~ ~ ~< 2 or 2.2 ~ ~ < 3 the third or fourth harmonic will dominate. The second and third harmonics of Z-mode waves grow faster only if 2 < ~ < 2.2 and 3 < r ~ 3.2, respectively, so it would not be a competition in most cases. It is suggested that the ECM emission at these harmonics in X-mode is a possible mechanism to produce solar spike emissions with high brightness temperature at shorter and longer decimetric wavelengths.

* Proceedings of the Workshop on Radio Continua during Solar Flares, held at Duino (Trieste),