Razin suppression in solar microwave bursts

Details Razin suppression in solar microwave bursts Razin suppression in solar microwave bursts

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..374..416b&link_type=abstract

High energy solar physics. AIP Conference Proceedings, Volume 374, pp. 416-423 (1996).

Physics

Solar Electromagnetic Emission

Scientific paper

We used data from the Owens Valley Solar Array to make a detailed investigation of the gyrosynchrotron spectrum of the flare of July 16 1992. The result of this investigation led us to propose a solution to a long-standing problem in solar microwave bursts, that of the constant peak frequency of the bursts as they evolve in brightness temperature, and the steep slope on the low-frequency side of the spectrum. We propose that the Razin effect is at work, and develop the theory of Razin suppression for solar microwave burst conditions. The Razin effect is the suppression of radiation from an electron in a medium in which the index of refraction is less than unity. We demonstrate that in a medium with density 2×1011 cm-3 and magnetic field 300 Gauss, conditions not uncommon for solar microwave bursts, the gyrosynchrotron spectrum can be suppressed for frequencies up to at least 10 GHz.

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