Resonances in the generation of electromagnetic signals due to the thermal cubic nonlinearity in the lower ionosphere

✍ Scribed by D.S. Kotik; E.N. Ermakova

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 182 KB
• Volume: 60
• Category: Article
• ISSN: 1364-6826
• DOI: 10.1016/s1364-6826(98)00053-4

✦ Synopsis

The resonances in generation of electromagnetic waves due to the thermal cubic nonlinearity are investigated theor! etically for a broad frequency range[ The possibility of an experimental check of the e}ect is discussed[ The experimental results for one of the resonances in the VLF frequency band are presented[ The magnitude of the ionospheric conductivity modulation produced at VLF by HF heating using the thermal cubic nonlinearity mechanism is found to be of the same order as that produced using direct amplitude modulation of the HF waves\ for VLF signals between 0 to 4 kHz[ Above 09 kHz VLF wave generation using the cubic nonlinearity mechanism is found to be more e.cient[ Þ 0887 Elsevier Science Ltd[ All rights reserved[