Generation and evolution of heater-induced density irregularities due to self-focusing instabilities in the ionosphere

Details Generation and evolution of heater-induced density irregularities due to self-focusing instabilities in the ionosphere Generation and evolution of heater-induced density irregularities due to self-focusing instabilities in the ionosphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa21c0373g&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA21C-0373

Physics

2403 Active Experiments, 2439 Ionospheric Irregularities, 2487 Wave Propagation (6934)

Scientific paper

Simulations of the generation and evolution of the ionospheric density irregularities due to self-focusing instabilities (SFI) are presented. A nonlinear, self-consistent development of the instabilities is studied with the 2D model of HF radio wave propagation in inhomogeneous magnetized plasmas. The full-wave model is coupled with the density and temperature equations. In these studies, the beam is incident vertically or tilted to the magnetic zenith direction. Our results demonstrate that irregularities generated and developed due to a local heating of the anisotropic ionospheric plasma are density depletions (striations) with a strong enhancement of electron temperature inside striations elongated along magnetic field lines. The reflection point of the ordinary wave is shifted upward with increasing density perturbations. During the evolution of the SFI, the formation of bunches of striations is observed. The number of 0.4-4 km bunch scale irregularities is increased when the beam is tilted to the magnetic zenith direction. The presented results are relevant to the experiments carried out at mid-latitude SURA HF heating facility, Russia and at high-latitude facility near Tromso, Norway

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