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Theory of radio pulsations in coronal loops

  • Invited Review
  • Session IV: Radio Pulsations
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Abstract

‘Pulsations’ include a wide range of phenomena from strictly sinusoidal oscillations up to quasiperiodic fine structures, observed in the radio, microwave and X-ray frequency range. The various versions of pulsation models are reviewed and classified in three groups according to their driver mechanisms: (1) Magnetic flux tube oscillations (the emissivity of trapped particles is modulated by a standing or propagating MHD wave), (2) cyclic self-organizing systems of plasma instabilities (wave-particle, wave-wave interactions), and (3) modulation of acceleration (acceleration/injection of particles into the source). Observational references illustrate the applicability of the models. In conclusion, discrimination criteria of models are discussed, in order to give a key for interpretation of observations.

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Authors and Affiliations

  1. Institute of Astronomy, ETH, Zürich, Switzerland

    M. J. Aschwanden

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  1. M. J. Aschwanden
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Proceedings of the Second CESRA Workshop on Particle Acceleration and Trapping in Solar Flares, held at Aubigny-sur-Nère (France), 23–26 June, 1986.

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Aschwanden, M.J. Theory of radio pulsations in coronal loops. Sol Phys 111, 113–136 (1987). https://doi.org/10.1007/BF00145445

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