T. B. Leyser* et al. (presented by B. Gustavsson)

Results are presented from two different experiments. First, Heating was used to enhance airglow in the nighttime F region. The enhanced airglow was detected with the multi-station Auroral Large Imaging System (ALIS) in northern Sweden and background plasma parameter values were measured using the EISCAT-UHF radars. The multi-station imaging enabled a tomography-like inversion technique to be used to obtain the approximate shape of the enhanced airglow cloud. Further, the airglow enhancement was correlated with large Heating-induced electron temperature enhancements of up to 250%, which extended several hundred kilometers above the pump reflection height.

Second, Heating was used to excite plasma turbulence in the auroral E region. The receiving equipment consisted of two crossed dipole antennas each connected to a Hewlett-Packard E1437A 20-MHz analogue-to-digital converter. Highly variable stimulated electromagnetic emissions (SEE) were observed as Heating transmitted a pump wave, which reflected in the nighttime E region. The dynamic SEE appeared in a more than 100-kHz wide band around the pump frequency. The SEE was predominantly polarized in ordinary mode, although Heating transmitted alternately in ordinary and extraordinary mode.

*On leave from the Swedish Institute of Space Physics, Uppsala Division