Electron Temperature Inversion by Stimulated Brillouin Scattering During Electron Gyroharmonic Heating at EISCAT

We presented EISCAT UHF observations of naturally en- hanced ion acoustic lines from two distinct altitude regions during auroral high-energy electron precipitation.. Spectral

Abstract— In ionospheric tomography, the atmospheric electron density is reconstructed from different electron density related measurements, most often from ground-based measure-

Figure 12: The black line is electron density calculated by using the temperature profile obtained by the CONE instrument on ECOMA 9, the blue line is electron density calculated

Upper panel shows equivalent electron densities measured by the EISCAT 224-MHz VHF radar (1-min integrated data), middle panel shows radar echo signal to noise ratio measured by

Second, electron density profiles measured with the EISCAT UHF radar in vicinity of the heating cycles are overcritical, and no E region topside at the altitude of the observed

On 22 January 2012 and 14 January 2013, the European Incoherent Scatter Scientific Association (EISCAT) radar on Svalbard measured electron temperature enhancements exceeding 3000 K

The increase of the electron density by up to 25%, accompanied by the strong HF-induced electron heating, was only observed when the heater frequency was near the critical frequency

The EISCAT Heating facilities transmitted a LHCP electromagnetic wave into the ionosphere directed in magnetic zenith, in a 3-min-on, 3-min-off cycle while stepping the pump