Gyro-synchrotron radiation from moving Type IV sources in the solar corona
Calculations of the gyro-synchrotron emission are made for conditions which might be expected in moving Type N sources in the solar corona. Two simple models for an evolving source are treated: a uniform cube and an inhomogeneous sphere. The results suggest that most moving sources have the following features: (1) A rather strong magneticic field, approximately 10 G, is carried out within the source. This is required to achieve the high degree of circular polarization often observed. (2) Synchrotron selfabsorption causes the source to be optically thick at frequencies less than about 100 MHz, thus restricting the bandwidth of the radiation. The self-absorption decreases as the source moves outward and expands. The turnover frequency, which separates the optically thick and thin spectral regimes, moves rapidly to lower frequencies, accompanied by a change from low to high circular polarization. In the case of an inhomogeneous source, the source appears to be larger at the lower frequencies. (3) Razin- Tsytovich suppression cannot be an important factor in determining the characteristics of most sources. (auth)
- Research Organization:
- CSIRO, Sydney
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-29-016631
- OSTI ID:
- 4335521
- Journal Information:
- Solar Phys., v. 32, no. 2, pp. 491-503, Other Information: Orig. Receipt Date: 30-JUN-74
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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