<i>Letter to the Editor</i> <br>UHF electromagnetic emission stimulated by HF pumping of the ionosphere
UHF electromagnetic emission (with a frequency near 600 MHz) from the F-region of the ionosphere pumped by an HF powerful radio wave is revealed. Possible mechanisms of the emission excitation, such as plasma mode con-version, scattering or Earth thermal noise emission off the plasma density...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2002-10-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/20/1687/2002/angeo-20-1687-2002.pdf |
| Summary: | UHF electromagnetic emission (with a
frequency near 600 MHz) from the F-region of the ionosphere pumped by an HF
powerful radio wave is revealed. Possible mechanisms of the emission
excitation, such as plasma mode con-version, scattering or Earth thermal noise
emission off the plasma density irregularities, bremsstrahlung and excitation
of high Rydberg states of the neutral particles by the accelerated electrons
are discussed.<br><br><b>Key words.</b> Ionosphere (active experiments;
wave-particle interactions) – Solar physics, astrophysics, and astronomy
(radio emissions) |
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| ISSN: | 0992-7689 1432-0576 |