Ionospheric modification by powerful HF-waves : Underdense F-region heating by X-Mode

Observations of modifications of the electron temperature in the F-region produced by powerful high-frequency waves transmitted in X-mode are presented. The experiments were performed during quiet nighttime conditions with low ionospheric densities so no reflections occurred. Nevertheless temperatur...

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Bibliographic Details
Main Author: Löfås, Henrik
Format: Bachelor Thesis
Language:English
Published: Uppsala universitet, Institutionen för fysik och astronomi 2008
Subjects:
Ionosphere
Wave propagation
Radio science
Ionospheric propagation
Waves in plasma
EISCAT
Space physics
Rymdfysik
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-121898
Description
Summary:Observations of modifications of the electron temperature in the F-region produced by powerful high-frequency waves transmitted in X-mode are presented. The experiments were performed during quiet nighttime conditions with low ionospheric densities so no reflections occurred. Nevertheless temperature enhancements of the order of 300-400K were obtained. The modifications found can be well described by the theory of Ohmic heating by the pump wave and both temporal and spatial changes are reproduced. A brief overview of several different experimental campaigns at EISCAT facilities in the period from October 2006 to February 2008 are also given pointing out some interesting features from the different experiments. The main focus is then on the campaign during October 2006 and modifications of the electron temperature in the F-region.

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