The polar cap absorption effect

  title={The polar cap absorption effect},
  author={D. C. Rose and S. M. Ziauddin},
  journal={Space Science Reviews},
Techniques for observing polar-cap absorption (PCA) events are outiined. The characteristics, time sequences, associated solar-terrestial phenomena, and effects of geomagnetic storms on PCA events are reviewed. The height of the absorbing region during the PCA event is considered. Solar radio emission during a Type-IV radio outburst is investigated, and the natures and spectra of solar particles that may be associated with PCA events are examined. The emission and interplanetary storage of… 
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