Discovery of unusual large group delay in microwave millisecond oscillating events

G. D. Fleishman, Q. J. Fu, G. L. Huang, V. F. Melnikov, M. Wang

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Two events demonstrating periodic narrowband millisecond pulsations of radio emission both in intensity and polarization degree are analyzed. Large time delays between L- and R-polarization components are found. The radio emission is shown to be generated as unpolarized by a plasma mechanism at the second harmonic of the upper-hybrid frequency. Observed oscillations of the radiation polarization degree arise due to group delay between extraordinary and ordinary modes along the line of sight. The theoretically predicted dependence of the group delay on frequency (∼ f-3) agrees excellently with the observed delay frequency dependence. Physical parameters of the emission source and "delay site" are determined within the proposed model.

Original languageEnglish (US)
Pages (from-to)671-685
Number of pages15
JournalAstronomy and Astrophysics
Issue number2
StatePublished - Apr 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Sun: flares
  • Sun: general
  • Sun: radio radiation


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