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Observations of HF-induced instability in the auroral E region
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2013 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 31, no 6, 1103-1108 p.Article in journal (Refereed) Published
Abstract [en]

Enhancements were observed in backscattered radar power during an ionospheric heating experiment from two distinct altitude regions in the auroral E region above Tromso. For the experiment the EISCAT Tromso 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 similar to 5 km) but distinct enhancements is close to the critical altitude for the heater wave.

Place, publisher, year, edition, pages
2013. Vol. 31, no 6, 1103-1108 p.
Keyword [en]
Ionosphere, active experiments
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-206674DOI: 10.5194/angeo-31-1103-2013ISI: 000322290400009OAI: oai:DiVA.org:uu-206674DiVA: diva2:645039
Available from: 2013-09-03 Created: 2013-09-02 Last updated: 2013-09-03Bibliographically approved

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Leyser, Thomas
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Swedish Institute of Space Physics, Uppsala Division
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