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- W2003755008 abstract "HF induced airglow has been observed at high latitudes on 21 February 1999 during a geomagnetically quiet period (Kp=1). This observation is unique because two patches were generated simultaneously on one occasion. The EISCAT Heating experiment (69.59° N, 19.23° E) was operated at 4.04 MHz (O-mode) in the local zenith from 16:48 to 18:28 UT using a 4-min. on and 4-min. off duty cycle. Simultaneously, the dynasonde measured the reflection height which increased from ∼200 to ∼290 km during the experiment. The Digital All-Sky Imager (DASI) was recording at 630 nm from Skibotn (69.35° N, 20.36° E), about 50 km east of Heating. Whilst viewing in the local zenith with ∼116° field of view, the development and fading of an airglow patch(es) corresponding to the Heater on and off times, respectively, could be clearly observed with an intensity of up to ∼100 Rayleighs. Sometimes a diffuse airglow would appear approximately within the Heater beam and sometimes a brighter and smaller airglow patch would develop near the magnetic field aligned position, which is ∼13° south of vertical. For the latter direction, it is estimated that the Heater power was 10 dB down from the maximum in the vertical. After 18:12 UT, the ionospheric critical frequency dropped below 4.04 MHz and no further airglow was observed." @default.
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- W2003755008 date "2000-01-01" @default.
- W2003755008 modified "2023-09-25" @default.
- W2003755008 title "HF induced airglow: Double patches!" @default.
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- W2003755008 doi "https://doi.org/10.1016/s1464-1909(00)00048-4" @default.
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