On the altitude of the HF-enhanced plasma lines

Details On the altitude of the HF-enhanced plasma lines On the altitude of the HF-enhanced plasma lines

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811671k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,671-11,676.

Physics

6

Electrostatic Waves, Field Aligned Currents, Line Spectra, Magnetohydrodynamic Stability, Plasma Spectra, Space Plasmas, Geomagnetism, Wave Propagation

Scientific paper

In the Arecibo heating experiments, observations show that the HF-heater-induced plasma lines (HFPLs) originate from a height about 1 km higher than the matching height determined by the location of the photon-enhanced natural plasma lines. The correlation of generation between HFPLs and the short-scale field aligned irregularities (SFAIs) is shown. A secondary parametric instability process is analyzed to explain the experimental observations. Near the HF reflection height, the wave electric field of the o-mode HF heater is in the direction parallel to the background geomagnetic field. The proposed secondary parametric instability process is the filamentation of the parallel propagating Langmuir waves. It is shown that it takes about twice the growth time of the HFPLs for the 3-m SFAIs to develop.

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