Solar Physics

, Volume 12, Issue 1, pp 125–142 | Cite as

Interpretation of type I- and IV mB-bursts and noise storms by mode coupling in the warm plasma

  • L. Mollwo


The circular polarization of radiation emitted from the solar type I- and IV mB-bursts and noise storms is not understood very well. For an attempted new explanation the dispersion equations for the ordinary (left-handed) and the extraordinary (right-handed) wave are derived from the well-known tensor conductivity of warm plasma proposing a very small angleϑ between magnetic field and propagation direction, and the plasma parametersX≈1,Y≈1. Taking into account a plasma temperature different from zero, conditions of a coupling point (Budden, 1961) are attained very nearly even if the very small collision frequency is neglected. It is shown, that the observed ordinary (left-handed) polarization may be explained by a process of mode-coupling between the originally emitted extraordinary (right-handed) wave and the resulting ordinary wave. The source of the right-handed radiation may be gyro-radiation or Čerenkov-radiation. The proposed mechanism is in accordance with the main observational facts. It remains open, whether the known magnetic asymmetry of active regions accounts for the prevailing left-handed polarization.


Radiation Magnetic Field Active Region Propagation Direction Circular Polarization 
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© D. Reidel Publishing Company 1970

Authors and Affiliations

  • L. Mollwo
    • 1
  1. 1.Zentralinstitut für solar-terrestrische Physik (HHI) der DAWBerlin-AdlershofDDR

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