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On the necessary complexity of modeling of the Polar Mesosphere Summer Echo Overshoot Effect

Published online by Cambridge University Press:  24 January 2012

ALEXANDER BIEBRICHER ,
OVE HAVNES  and
RADOVAN BAST
ALEXANDER BIEBRICHER
Affiliation:
Department of Physics and Technology, University of Tromsø, Nordlysobservatoriet, 9037 Tromsø, Norway ([email protected])
OVE HAVNES
Affiliation:
Department of Physics and Technology, University of Tromsø, Nordlysobservatoriet, 9037 Tromsø, Norway ([email protected]) University Centre at Svalbard (UNIS), Pb. 156, 9171 Longyearbyen, Norway
RADOVAN BAST
Affiliation:
Centre for Theoretical and Computational Chemistry (CTCC), Department of Chemistry, University of Tromsø, 9037 Tromsø, Norway
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Abstract

Recent numerical studies of the Polar Mesosphere Summer Echo (PMSE) Overshoot Effect predict the basic shape of the Overshoot Characteristic Curve (OCC) to undergo dramatic changes as the frequency of the radar decreases. Principally, this may render earlier modeling, which assumed near-instantaneous diffusion of electrons and ions, moot and exacerbate algebraic analysis of OCC obtained in the future with, e.g. the MORRO-radar (56 MHz) and a synchronized radio wave emitter, both at or near the European Incoherent Scatter (EISCAT) Scientific Association's site in Ramfjordmoen near Tromsø, Norway. Since, however, by far the most observational results on the PMSE Overshoot Effect have been assembled with the help of the Very High Frequency (VHF, 224 MHz) radar and the an Ultra High Frequency (UHF, 929 MHz) radar, both at the EISCAT site, we examine more closely whether near-instantaneous diffusion is a valid assumption for these particular frequencies. We show that, indeed, the earlier less complex and analytically more accessible model can still be considered sufficient for most, if not all, existing experimental data.

Type
Papers
Information
Journal of Plasma Physics , Volume 78 , Issue 3 , June 2012 , pp. 225 - 239
Copyright
Copyright © Cambridge University Press 2012

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