Physics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11203306l&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue A3, CiteID A03306
Physics
5
Ionosphere: Active Experiments, Ionosphere: Particle Acceleration, Ionosphere: Plasma Waves And Instabilities (2772), Ionosphere: Ionospheric Irregularities, Ionosphere: Wave/Particle Interactions (7867)
Scientific paper
The Naval transmitter, code-named NAU, in Puerto Rico emits radio waves at a power and frequency of 100 kW and 40.75 kHz, respectively. The NAU-generated 40.75 kHz whistler-mode waves are intense enough to excite lower hybrid waves and zero-frequency field-aligned ionospheric irregularities over Arecibo. It is proposed that NAU is responsible for causing the enhanced plasma lines, detected by the Arecibo 430 MHz radar in the nighttime ionosphere F region, in the presence of spread F events. The lower hybrid waves, generated in a broad range of altitudes at the wake of 40.75 kHz whistler-mode waves, have a single frequency of 40.75 kHz but with a spectrum of wavelengths. They can effectively accelerate electrons continuously along the Earth's magnetic field with energies from a fraction of 1 eV to 10 eV. These energetic streaming electrons, when detected by the Arecibo 430 MHz radar, give rise to enhanced plasma lines with a frequency spectrum of ~3.25-4.75 MHz.
Burton L. M.
Cohen Jack A.
Kuo Spencer P.
Labno A.
Lee Ming-Chang
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