Physics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...99..277l&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 99, Sept. 1985, p. 277-284.
Physics
3
Coherent Radiation, Plasma-Electromagnetic Interaction, Type 4 Bursts, Brightness Temperature, Circular Polarization, Plasma Jets, Solar Corona, Solitary Waves, Whistlers
Scientific paper
A new coherent radiation mechanism, involving nonlinear interaction of whistler solitons with upperhybrid waves, excited by energetic electrons of energies of 10 keV-100keV, is proposed for type IV solar bursts of both moving (type IV M) and stationary (type IV S) types. It has been shown that the type IV M bursts occur when the interaction of whistler solitons and upperhybrid waves takes place in the coronal transients, whereas the type IV S bursts originate only if this interaction takes place in stationary loops where density has been increased. The emitted radiation is right-hand circularly polarized with about 100 percent polarization. Increase of brightness temperature, T(b), at lower frequencies, and also it decreases at all frequencies, with the passage of time is predicted for type IV M bursts; this agrees fully with the observations. Furthermore, the decrease of T(b) with time for stationary type IV component is easily explained if the source which supplies energetic electron to the loop becomes weaker with time.
Buti B.
Lakhina Gurbax S.
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