Other
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acasn..48..441h&link_type=abstract
Acta Astronomica Sinica, vol. 48, no. 4, p. 441-448
Other
Sun:Radio Radiation, Physical Data And Processes: Plasmas, Methods: Numerical
Scientific paper
The dispersion relation of the Langmuir Waves (LW) is analytically studied. And also the generating mechanism of the backward propagating LW and the second harmonic LW is studied by particle in cell (PIC) simulations. This paper focus on the study of plasma radiation mechanism. The dispersion relation and mechanism of the backward propagating LW are carefully studied. Generally, the conversion of LW into electromagnetic radiations is an important mechanism of solar type III bursts. LW can be easily excited by electron beam instability. The second harmonic waves of type III bursts are produced through the coalescence of forward and backward propagating LW, which are studied in this paper analytically and numerically, in the equations of two stream instability with thermal velocity. It is found that the dispersion relation of the forward propagating LW strongly depends on the beam speed, and dispersion relation of the backward propagating LW only varies with the thermal velocity,when the other parameters are fixed. The analytical results are partly confirmed by the particle in cell (PIC) simulations. It is confirmed that the ions play a key role in exiting the backward propagating Langmuir waves. The PIC simulations shows that the dispersion relation strongly depends on the plasma temperature.The slopes of both sides of dispersion curves increase with the temperature. The speed of beam electrons only has a weak influence on the dispersion curves in both of k>0 and k<0 sides. We also analyze the mechanism of the generation of the backward propagating LW by using PIC simulations. We use the forward propagating LW instead of the beam electrons, as the free energy to excite the backward propagating LW and the forward propagating LW at the second harmonic. It is found that the electron beam can hardly convert into backward LW directly, but it can partly amplify the second harmonic LW directly.
Huang Guang Li
Huang Yong-Yi
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