Volume 37 Issue 4
Jul.  2017
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YANG Ding, FANG Hanxian, WANG Sicheng. Effects of Background Conditions on Lower Ionosphere Pre-heating Amplitude-modulation[J]. Journal of Space Science, 2017, 37(4): 403-413. doi: 10.11728/cjss2017.04.403
Citation: YANG Ding, FANG Hanxian, WANG Sicheng. Effects of Background Conditions on Lower Ionosphere Pre-heating Amplitude-modulation[J]. Journal of Space Science, 2017, 37(4): 403-413. doi: 10.11728/cjss2017.04.403

Effects of Background Conditions on Lower Ionosphere Pre-heating Amplitude-modulation

doi: 10.11728/cjss2017.04.403
  • Received Date: 2016-08-30
  • Rev Recd Date: 2017-03-07
  • Publish Date: 2017-07-15
  • Based on the energy conservation equation and electron continuity equation, the Pre-heating Amplitude-Modulated Theoretical Model (PAMTM) of ionospheric current modulated by powerful HF radio waves, is constructed. The oscillations process of ionospheric density in pre-heating period and current in modulation period are analyzed. Moreover, the effects of different background condition on radiation strength of electromagnetic wave in Extremely Low Frequency/Very Low Frequency (ELF/VLF) band are studied in details by use of PAMTM. The results indicate that PAMTM is more effective in the daytime than in the nighttime. It has the largest strength increment in spring and the intensity of pre-heating amplitude at solar maximum is bigger than that of solar minimum. Its intensity increment amplitude at low latitude is stronger than that of middle latitude. Under certain heating conditions (fERP=200MW, fELF/VLF=1kHz), the effect of the PAMTM is the best when the pre-heating time is 10s considering energy loss, and ELF/VLF radiation levels can be improved by 10.00dB.

     

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