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- W1974127860 abstract "Optical emissions and incoherent scatter radar data obtained during high-frequency electromagnetic pumping of the ionospheric plasma from the ground give data on electron energization in an energy range from 2 to 100 eV. Optical emissions at 4278 AA{} from $mathrm{N}_{2}{}^{+}$ that require electrons with energies above the 18 eV ionization energy give the first images ever of pump-induced ionization of the thermosphere. The intensity at 4278 AA{} is asymmetric around the ionospheric electron gyroharmonic, being stronger above the gyroresonance. This contrasts with emissions at 6300 AA{} from $mathrm{O}(^{1}mathrm{D})$ and of electron temperature enhancements, which have minima at the gyroharmonic but have no apparent asymmetry. This direct evidence of pump-induced ionization contradicts previous indirect evidence, which indicated that ionization is most efficiently produced when the pump frequency was below the gyroharmonic." @default.
- W1974127860 created "2016-06-24" @default.
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- W1974127860 date "2006-11-09" @default.
- W1974127860 modified "2023-09-26" @default.
- W1974127860 title "Electron Gyroharmonic Effects in Ionization and Electron Acceleration during High-Frequency Pumping in the Ionosphere" @default.
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- W1974127860 doi "https://doi.org/10.1103/physrevlett.97.195002" @default.
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