[PEM14-P05] Recent improvement of SuperDARN interferometry and neutral wind observation
キーワード：SuperDARN、干渉計観測、中性風、校正、電離圏-中性大気上下結合、中間圏界面
SuperDARN (Super Dual Auroral Radar Network) is an international HF radar network originally intended to cover a wide range of polar ionosphere in both hemispheres by its fields-of-view and to monitor global ionospheric plasma convection in high temporal resolution of about 1 minitue in quasi real time mainly for space weather research. It can observe not only ionospheric plasma Doppler velocity and electric field, a variety of geomagnetic waves, ionospheric disturbances and irregularities, but also polar mesoephere echoes like PMSEs and neutral wind around mesopause region using meteor echoes. As it is originally designed to measure global ionospheric plasma parameters, the spatial resolution has been rather coarse and it was originally difficult to obtain vertical profile of neutral wind (Hall et al., 1997). By applying raw IQ time series analysis method (Yukimatu, GRL, 2002), decucing the height profile of neutral wind was achieved and using more sophisticated observational manners like frequency domain interferometry and oversampling technique, the resolution of neutral wind vertical profile was improved down to a few km or so (Tsutsumi et al., 2009), but such observation has been routinely made at a limited number of SD radars due to, e.g., lack of enough interferemter calibration. Recently how to overcome an issue on interferometer calibration of each SuperDARN radar has been well discussed in the SuperDARN community, the accuracy or reliability of height information of near range echoes and neutral wind measurement could also possibly be drastically improved at many SD radars in near future. As SuperDARN radars are distributed in mid to high latitude in a wide longitudinal range globally, it could contribute much to understand mesosphere-lower-thermosphere (MLT) region dynamics and vertical coupling between ionosphere and neutral upper atmosphere. The details of future observational and scientific development and perspective will be shown and discussed.