Physics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982chjss...2..261l&link_type=abstract
Chinese Journal of Space Sciences, vol. 2, Oct. 1982, p. 261-268. In Chinese, with abstract in English.
Physics
Brightness Temperature, Plasma Radiation, Solar Flares, Solar Physics, Superhigh Frequencies, Type 4 Bursts, Coronal Loops, Electron Energy, Electrostatic Waves, Ion Acoustic Waves, Plasma Clouds, Stellar Models, Transverse Waves, Wave Interaction
Scientific paper
A new model and radiation mechanism for type IVmA bursts are presented. Plasma clouds ejected during the explosive phase of a flare move upward inside a large magnetic arc, and trapped nonthermal electrons with forward-cone gap distribution excite Langmuir waves. Where the electron temperature T(e) is much greater than the ion temperature T(i), there should be ion sound waves in the source. An electromagnetic transverse wave is produced through nonlinear interaction between the two types of waves and the type IVmA burst takes place. The brightness temperature spectra and evolution for eight announced events are calculated and the results agree well with observations. Radiation processes for T(e) = T(i) and T(e) much greater than T(i) are compared, and it is shown that the latter condition is more probably true. Thus the main contribution to the type IVmA burst, and probably to other types of solar radio bursts as well, comes from a nonlinear process rather than ion scattering.
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