Journal of Plasma Physics



Papers

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


N. BORISOV a1a2, A. SENIOR a1 and F. HONARY a1
a1 Department of Communication Systems, Lancaster University, Lancaster LA1 4YR, UK (a.senior@lancaster.ac.uk)
a2 Institute of Terrestrial Magnetism, Ionosphere and Radio Waves Propagation, (IZMIRAN) 142190, Troitsk, Moscow Region, Russia

Article author query
borisov n   [Google Scholar] 
senior a   [Google Scholar] 
honary f   [Google Scholar] 
 

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.

(Published Online May 10 2005)
(Received September 25 2003)
(Revised January 30 2004)
(Accepted March 14 2004)