11 research outputs found
Anomalous attenuation of extraordinary waves in the ionosphere heating experiments
Multiple scattering of radio waves by artificial random irregularities
HF-induced in the ionosphere F region may cause significant attenuation of both
ordinary and extraordinary waves together with common anomalous absorption of
ordinary waves due to their non-linear conversion into plasma waves. To
demonstrate existence and strength of this effect, direct measurements of
attenuation of both powerful pump wave and weak probing waves of extraordinary
polarization have been carried out during an experimental campaign on September
6, 7 and 9, 1999 at the Sura heating facility. The attenuation magnitude of
extraordinary waves reaches of 1-10 dB over a background attenuation caused by
natural irregularities. It is interpreted in the paper on the base of the
theory of multiple scattering from the artificial random irregularities with
characteristic scale lengths of 0.1-1 km. Simple procedure for determining of
irregularity spectrum parameters from the measured attenuation of extraordinary
waves has been implemented and some conclusions about the artificial
irregularity formation have been obtained.Comment: 17 pages, 9 figure
Ionospheric gas dynamics of satellites and diagnostic probes
The gas dynamics of interactions of a tenuous ionosphere with moving satellites and probes that have bearings on the diagnostics of the ionosphere are discussed. Emphasis is on the cases where the body is moving at mesothermal speeds, namely intermediate between the thermal speeds of ions and electrons of the ambient ionosphere. Methods of collision-free plasma kinetics with self-consistent field are used. The development of the topics for discussion starts with stationary Langmuir probe which entails the basic mechanism of body-plasma interaction that becomes further intricated as the body moves at a higher and higher speed. Applications of the theory of plasma interaction to meteors which move in the ionosphere are also presented.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/43801/1/11214_2004_Article_BF00212707.pd