Measurements of Enhanced Absorption of Electromagnetic Waves and Effective Collision Frequency Due to Parametric Decay Instability

1972 ◽  
Vol 29 (10) ◽  
pp. 634-638 ◽  
Author(s):  
T. K. Chu ◽  
H. W. Hendel
Keyword(s):  
Electromagnetic Waves ◽  
Collision Frequency ◽  
Decay Instability ◽  
Enhanced Absorption ◽  
Parametric Decay ◽  
Effective Collision Frequency ◽  
Parametric Decay Instability ◽  
Effective Collision

Mode-Coupling Analysis of Parametric Decay Instability in Magnetized Plasmas

2014 ◽  
Vol 16 (9) ◽  
pp. 809-814
Author(s):  
Yuan Yuan ◽  
Zhonghe Jiang ◽  
Weixin Guo ◽  
Xinfeng Sun ◽  
Xiwei Hu
Keyword(s):  
Mode Coupling ◽  
Magnetized Plasmas ◽  
Coupling Analysis ◽  
Decay Instability ◽  
Parametric Decay ◽  
Parametric Decay Instability

Theory of energy flux and polarization changes of a radio wave with two magnetoionic components undergoing self demodulation in the ionosphere

1974 ◽  
Vol 341 (1626) ◽  
pp. 361-381 ◽  
Keyword(s):  
Electron Temperature ◽  
Radio Wave ◽  
Phase Difference ◽  
Incident Wave ◽  
Unit Volume ◽  
Collision Frequency ◽  
Lower Ionosphere ◽  
Effective Collision Frequency ◽  
Composite Wave ◽  
Effective Collision

The absorption of a powerful plane radio wave vertically incident on the lower ionosphere is studied. If it contains the two magnetoionic components with roughly equal amplitudes, the power absorbed per unit volume can be either greater or less than the sum of the powers for the separate components, depending on their phase difference. This is determined by the polarization of the incident wave, and the heights where the absorption is a maximum can be changed by changing this polarization. The power absorbed causes an increase in the electron temperature and thence in the effective collision frequency. This is studied first for an unmodulated wave. If the wave is amplitude modulated, the increase of collision frequency varies periodically in the modulation cycle. This results in self demodulation which is different for the two magnetoionic components because of their different rates of absorption. The result is that the polarization of the composite wave varies periodically over the modulation cycle.

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