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Observations of HF-induced instability in the auroral E region

Author(s): N. M. Schlatter | N. Ivchenko | B. Gustavsson | T. Leyser | M. Rietveld

Journal: Annales Geophysicae
ISSN 0992-7689

Volume: 31;
Issue: 6;
Start page: 1103;
Date: 2013;
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Enhancements were observed in backscattered radar power during an ionospheric heating experiment from two distinct altitude regions in the auroral E region above Tromsø. For the experiment the EISCAT Tromsø heater was operated with O mode and X mode alternated at 4.04 MHz, close to the 3rd electron gyroharmonic. Ion-line data recorded with the EISCAT UHF radar reveal different temporal evolutions as well as different ion-line characteristics for the enhancements from the two altitude regions. The upper layer is dominated by a strong central feature, whereas the lower layer has three peaks corresponding to the central feature and the two ion lines. The altitude region of the two closely spaced (altitude separation ~ 5 km) but distinct enhancements is close to the critical altitude for the heater wave.

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