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Stationary state and relaxation of artificial irregularities excited in ionospheric heating experiments

Published online by Cambridge University Press:  10 May 2005

N. BORISOV ,
A. SENIOR  and
F. HONARY
N. BORISOV
Affiliation:
Department of Communication Systems, Lancaster University, Lancaster LA1 4YR, UK ([email protected]) Institute of Terrestrial Magnetism, Ionosphere and Radio Waves Propagation, (IZMIRAN) 142190, Troitsk, Moscow Region, Russia
A. SENIOR
Affiliation:
Department of Communication Systems, Lancaster University, Lancaster LA1 4YR, UK ([email protected])
F. HONARY
Affiliation:
Department of Communication Systems, Lancaster University, Lancaster LA1 4YR, UK ([email protected])
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Abstract

We analytically and numerically discuss the plasma distribution and electron temperature enhancement in striations for a given heating source. It is shown that, in stationary conditions, the reduced plasma concentration and the temperature enhancement should be of the same order of magnitude. We deduce that the electron temperature inside striations cannot greatly exceed that in the heated volume. The elongation of striations is calculated for different transverse scales and heating powers. We show that medium sized irregularities are associated with striations and develop after the formation of striations. The peculiarities of the relaxation process for small-scale and medium sized artificial irregularities are investigated and it is found that the relaxation of small-scale irregularities exhibits two time scales, in qualitative agreement with experimental observations.

Type
Papers
Information
Journal of Plasma Physics , Volume 71 , Issue 3 , June 2005 , pp. 315 - 334
Copyright
2005 Cambridge University Press

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