Accession Number : ADP001439

Title :   The Mechanism of the U-Shaped Spectrum of Type IV Solar Radio Bursts,

Corporate Author : NANJING UNIV (CHINA) DEPT OF ASTRONOMY

Personal Author(s) : Li,Chun-Sheng ; Zheng,Wing-Wu ; Yao,Jin-Xing

Report Date : 27 DEC 1982

Pagination or Media Count : 15

Abstract : A mechanism is suggested to account for the U-shaped spectrum of the Type IV solar radio burst during the explosive phase of a proton flare. The U-shaped spectrum consists of two parts, namely the part of Type IV-mu burst and that of Type IV-dm burst. Each of them is believed to be produced by gyro-synchrotron radiation of non-thermal electrons (100 keV < or = epsilon < or = 2 Mev) being accelerated simultaneously with protons in the explosive phase and gyro-resonance absorption of thermal electrons. Numerical calculations are presented for the flux densities of Type IV-mu burst and Type IV-dm burst during the 1972 August 7 event, assuming a cylindrical volume of these burst sources. It is shown that the computed results are consistent with that of observations. In addition, we also discuss the relation between the U-shaped spectrum of a Type IV radio burst and the occurrence of a proton event. (Author)

Descriptors :   *Solar flares, *Radio signals, Spectrum signatures, Burst transmission, Solar radiation, Protons, High acceleration, Emission spectra, Plasmas(Physics), China

Distribution Statement : APPROVED FOR PUBLIC RELEASE