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Measurements and modeling of cosmic noise absorption changes due to radio heating of the D region ionosphere

Senior, A. and Rietveld, M.T. and Honary, F. and Singer, W. and Kosch, M.J. (2011) Measurements and modeling of cosmic noise absorption changes due to radio heating of the D region ionosphere. Journal of Geophysical Research, 116 (A04310). pp. 1-10. ISSN 0148-0227

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Abstract

Powerful high‐frequency radio waves can heat the electrons in the D region of the ionosphere. This heating increases the electron‐neutral collision frequency which modifies the absorption of other radio waves propagating through the heated plasma. A high spatial resolution imaging riometer was used to observe changes in cosmic radio noise absorption (CNA) induced by heating from the European Incoherent Scatter (EISCAT) HF facility, and the results were compared to a theoretical model using observed electron densities as an input. The model is found to overestimate the observed effect by a factor close to 2, despite different background electron density profiles and heater powers. However, the model reproduced the spatial morphology of the change in CNA rather well, and the same absorption calculation used in the heating model also reproduced the changes in CNA due to electron precipitation in the absence of heating well. When the assumption of a perfectly conducting ground is replaced with a more realistic model in the calculation of the HF radiated power, the power is reduced to about 75% of its original value, and the model overestimate of the CNA change is reduced to a factor of about 1.3.

Item Type: Article
Journal or Publication Title: Journal of Geophysical Research
Additional Information: Copyright (2011) American Geophysical Union. Further reproduction or electronic distribution is not permitted.
Uncontrolled Keywords: riometer ; eiscat ; heating DCS-publications-id ; art-1026 ; DCS-publications-credits ; aries ; iono-fa ; iris ; DCS-publications-personnel-id ; 51 ; 5 ; 7
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > School of Computing & Communications
Faculty of Science and Technology > Physics
Faculty of Science and Technology > Engineering
ID Code: 40213
Deposited By: Dr Steve Marple
Deposited On: 15 Apr 2011 13:04
Refereed?: Yes
Published?: Published
Last Modified: 23 Apr 2014 17:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/40213

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