Solar Physics

, Volume 59, Issue 2, pp 377–385 | Cite as

Low frequency spectra of type III solar radio bursts

  • Richard R. Weber
Article
Received:

Abstract

Flux density spectra have been determined for ninety-one simple type III solar bursts observed by the Goddard Space Flight Center radio astronomy experiment on the IMP-6 spacecraft during 1971 and 1972. Spectral peaks were found to occur at frequencies ranging from 44 kHz up to 2500 kHz. Half of the bursts peaked between 250 kHz and 900 kHz, corresponding to emission at solar distances of about 0.3 to 0.1 AU. Maximum burst flux density sometimes exceeds 10−14 W m−2 Hz−1. The primary factor controlling the spectral peak frequency of these bursts appears to be variation in intrinsic power radiated by the source as the exciter moves outward from the Sun, rather than radio propagation effects between the source and IMP-6. Thus, a burst spectrum strongly reflects the evolution of the properties of the exciting electron beam, and according to current theory, beam deceleration could help account for the observations.

Keywords

Radio Burst Solar Radio Radio Astronomy Solar Radio Burst Flux Density Spectrum 
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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Copyright information

© D. Reidel Publishing Company 1978

Authors and Affiliations

  • Richard R. Weber
    • 1
  1. 1.NASA/Goddard Space Flight Center, Laboratory for Extraterrestrial PhysicsGreenbeltUSA

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