A thermal/nonthermal model for solar microwave bursts

Details A thermal/nonthermal model for solar microwave bursts A thermal/nonthermal model for solar microwave bursts

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..854b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 2, June 1, 1992, p. 854-864.

Astronomy and Astrophysics

Astrophysics

45

Cyclotron Radiation, Microwaves, Solar Flares, Solar Radio Bursts, Synchrotron Radiation, Distribution Functions, Electric Fields

Scientific paper

A theoretical framework is developed for modeling high-resolution spectra of microwave bursts from the Owens Valley Radio Observatory which can account for departures from expectations based on simple thermal or nonthermal models. Specifically, 80 percent of the events show more than one spectral peak; many bursts have a low-side spectral index steeper than the maximum expected slope; and the peak frequency stays relatively constant and changes intensity in concert with the secondary peaks throughout a given event's solution. It is shown that the observed spectral features can be explained through gyrosynchrotron radiation. The 'secondary' components seen on the LF side of many spectra are nonthermal enhancements superposed upon thermal radiation, occurring between the thermal harmonics. A steep optically thick slope is accounted for by the thermal absorption of nonthermal radiation. If the coexistence of thermal and nonthermal particles is interpreted in terms of electron heating and acceleration in current sheets, a changing electric field strength can account for the gross evolution of the microwave spectra.

Affiliated with

Also associated with

No associations

Rating

A thermal/nonthermal model for solar microwave bursts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A thermal/nonthermal model for solar microwave bursts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A thermal/nonthermal model for solar microwave bursts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1199891