Title :
Spatial relationship of F-region field-aligned irregularities and medium-scale traveling ionospheric disturbances observed with the MU radar and all-sky airglow imagers
Author :
Otsuka, Yuichi ; Shiokawa, Kazuo ; Ogawa, Tadahiko ; Yokoyama, Tatsuhiro ; Yamamoto, Mamoru
Author_Institution :
Solar-Terrestrial Environ. Lab., Nagoya Univ., Nagoya, Japan
Abstract :
We report simultaneous observations of medium-scale traveling ionospheric disturbances (MSTIDs) and field-aligned irregularities (FAIs) in the F region by using two all-sky airglow imagers and the MU radar in Japan. MSTIDs propagating southwestward were observed in 630-nm airglow images on the night of June 16, 2004. During this MSTID event, FAIs in the F region were observed by making multibeam measurements with the MU radar. We found that FAIs with intense (weak) signal-to-noise ratio (SNR) coincided with the airglow depletion (enhancement) caused by the MSTIDs. This result indicates that the FAIs could be generated by the gradient drift instability at the airglow depletion region.
Keywords :
F-region; airglow; ionospheric disturbances; ionospheric measuring apparatus; remote sensing by radar; AD 2004 06 16; F-region field-aligned irregularities; Japan; MU radar; airglow depletion; airglow enhancement; all-sky airglow imager; gradient drift instability; medium-scale traveling ionospheric disturbance; signal-to-noise ratio; wavelength 630 nm; Backscatter; Communications technology; Doppler radar; Electrons; Geomagnetism; Geoscience; Plasma measurements; Radar imaging; Radar measurements; Signal to noise ratio; FAI; Ionospheric irregularity; MSTID; VHF radar; airglow;
Conference_Titel :
ICCAS-SICE, 2009
Conference_Location :
Fukuoka
Print_ISBN :
978-4-907764-34-0
Electronic_ISBN :
978-4-907764-33-3
