FEATURES OF ARTIFICIAL IONOSPHERE TURBULENCE INDUCED BY THE O- AND X-MODE HF HEATING NEAR THE F2-LAYER CRITICAL FREQUENCY
Journal Title: Solar-Terrestrial Physics - Year 2023, Vol 9, Issue 1
Abstract
We present experimental results from the studies of large-scale inhomogeneities along the external magnetic field with increased electron density, electron temperature, and excitation of elongated plasma waves (Langmuir and ion-acoustic), induced by the ordinary (O-mode) and extraordinary (X-mode) HF heating near the F2-layer critical frequency, in the high-latitude ionospheric F-region. The experiments have been carried out at the EISCAT/Heating facility (Tromsø, Norway). Powerful HF radio waves radiated towards the magnetic zenith through a step change in the effective radiated power at frequencies fH near and below the F2-layer critical frequency fₒF2. The EISCAT incoherent scatter radar (930 MHz), co-located with the EISCAT/Heating facility, was utilized for diagnostics of ionospheric modification effects. We calculated the electric field of a powerful HF radio wave near the reflection altitude, taking into account the non-deflective absorption along the propagation path. We determined the conditions for electric field generation and its threshold (minimum) values required for electron density enhancements in a wide altitude range, excitation of Langmuir and ion-acoustic plasma waves under fH~fₒF2 and fH
Authors and Affiliations
Borisova T. D. , Blagoveshchenskaya N. F. , Kalishin A. S.
Keywords
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- EP ID EP714637
- DOI 10.12737/stp-91202303
- Views 93
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