Observations of the temporal and spatial development of induced and natural plasma lines during HF modification experiments at Arecibo using chirped incoherent scatter radar

Details Observations of the temporal and spatial development of induced and natural plasma lines during HF modification experiments at Arecibo using chirped incoherent scatter radar Observations of the temporal and spatial development of induced and natural plasma lines during HF modification experiments at Arecibo using chirped incoherent scatter radar

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813605i&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,605-13,625.

Physics

13

F Region, Ionospheric Electron Density, Particle Interactions, Plasma Waves, Radio Frequency Heating, Electron Energy, Incoherent Scatter Radar, Plasma Density

Scientific paper

Observations were made of the HF-modified ionosphere over Arecibo during the daytime and during the nighttime using chirped incoherent scatter radar. The daytime observations show a difference in the frequencies of the HF-induced plasma line (HFPL) and the photoelectron-enhanced (natural) plasma line (PEPL) at the same height of the order of 100 kHz. In addition, the daytime HFPL originates within about 200 m of the reflection height, often within 20 ms of HF turn-on, and may remain at that location for many seconds. A second HFPL source region was sometimes observed to form between approximately 1 and 4 km below the usual source region after 5 to 10 s of heating. During the nighttime, rapidly changing regions of HF-induced plasma lines spread over more than 3 km in height were observed; the existence of these regions appears to be strongly dependent on HF heating power. At times, frequency shifting and broadening of the PEPL during heating was noted; the shift in frequency is due to increasing electron temperature and the frequency broadening to the appearance of short-scale density striations. These effects continued even during periods when the heater remained on and the HF-induced line was not observed by the radar.

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