It is argued (a) that the onset times of type III radio emission and of the streaming electrons implies that type III bursts in the interplanetary medium are generated predominantly at the fundamental, (b) that in view of recent observations of ion-sound waves in the interplanetary medium the theory
The necessity of fundamental emission in type III bursts
โ Scribed by Dean F. Smith; William D. Davis
- Publisher
- Springer
- Year
- 1975
- Tongue
- English
- Weight
- 489 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0038-0938
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โฆ Synopsis
Observations of some type IlI radio bursts in the hectometer and kilometer wave range are compared with theoretical predictions. It is shown that the burst emission must be near the plasma frequency in the region between 10 Re and 50 R| in order to be consistent with the observed steep rise in brightness temperature for these bursts. The results of Fainberg, Malitson et al., and Haddock and Alvarez are discussed and compared with the interpretation of emission near the plasma frequency.
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Different forms of pairs of type III bursts have been discussed in the literature. We report here a new aspect revealed by high time resolution radioheliography. In some groups of these bursts, each element appears to be split into two components. These pairs recur with a characteristic time, and in
There are three kinds of observations that provide indirect evidence for the contentions that (a) some type III radiation is fundamental radiation; and (b) type III's are at times emitted simultaneously as fundamental and second-harmonic plasma radiation.
## Discussion D. Smith: I know spontaneous emission maximizes at about 90 ~ However, if B is present, amplification maximizes at about 0 ~ with respect to B. Rosenberg: No. D. Smith: According to Yip the growth rate maximizes along the magnetic field. Rosenberg" Direction of B does not make that
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