Publication: Simultaneous ground-based optical and HF radar observations of the ionospheric footprint of the open/closed field line boundary along the geomagnetic meridian

Chen, X.-C., D. A. Lorentzen, J. I. Moen, K. Oksavik, and L. J. Baddeley (2015),  Simultaneous ground-based optical and HF radar observations of the ionospheric footprint of the open/closed field line boundary along the geomagnetic meridian, J. Geophys. Res., doi.org/10.1002/2015JA021481 (pdf)