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Some Aspects of Type-IV Continuum Radiation on Decimeter Wavelengths

  • M. R. Kundu
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 2)

Abstract

The flare associated continuum bursts of Type IV in the 500–1000 Mc/s range in general consist of a smooth continuum with different variabilities superimposed upon it (Kundu and Spencer, 1963). These variabilities can take various forms. They are often short-duration fast-drift bursts which appear to be different in nature from the high frequency components of meter-wave bursts of Type III. The intense fast-drift elements which are the most dominant radiation in some dm-λ continuum events are sometimes so blended together as to make the continuum radiation appear to be composed of a succession of fast-drift bursts of fine structure. Even in such events, the smooth background continuum appears clearly whenever the superimposing fast-drift elements are weak or absent (Figure la). Occasionally the fast-drift elements occur in the form of “sprays” (Figure lb). Sometimes drifting patches occur over short periods in course of the continuum event. The individual patches, usually of duration less than 1/2 minute, often drift at the rate of several Mc/s per sec from low to high frequencies over bandwidths of the order of 200–400 Mc/s in the 500–1000 Mc/s range (Figure 1c). In addition, intermediate-drift bursts are occasionally superimposed upon the continuum (Young et al. 1961) ; these are short duration (< 1 sec at one frequency) bursts drifting from high to low frequencies at rates of about 30 Mc/s per second.

Keywords

Shock Front Plasma Oscillation Continuum Radiation Radio Astronomy Observatory Electron Plasma Wave 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Cohen, M. H.: 1961, Astrophys. J. 133, 978.ADSCrossRefGoogle Scholar
  2. Kundu, M. R. and Spencer, C. L.: 1963, Astrophys. J. 137, 572.ADSCrossRefGoogle Scholar
  3. Kundu, M. R. and Smerd, S. F.: 1962, Information Bull. Solar Rad. Obs., Europe 11, 4.Google Scholar
  4. Takakura, T.: 1960, Publ. Astron. Soc. Japan 12, 325.ADSGoogle Scholar
  5. Young, C. W., Spencer, C. L., Moreton, G. E., and Roberts, J. A.: 1961, Astrophys. J. 133, 243.ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1965

Authors and Affiliations

  • M. R. Kundu
    • 1
  1. 1.Astronomy DepartmentCornell UniversityIthacaUSA

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