[1] [1] Bowman M. R., Gibson A. J., Sandford M. C. W.. Observation of mesospheric Na atomes by tuner laser radar. Nature (London), 1969, 221: 456～457

[2] [2] Von Zahn V., Hansen T. L.. Sudden neutral sodium layers: a strong link to sporadic E layers. J. Atmos. Terr. Phys., 1988, 50: 93～104

[3] [3] Mathews J. D., Morton Y. T., Zhou Q.. Observations of ion layer motions during the AIDA campaign. J. Atmos. Terr. Phys., 1993, 55: 447～457

[4] [4] Kane T. J., Gardner C. S., Zhou Q.. Lidar, radar and airglow observations of a spectacuar sporadic Na/sporadic E layer event at Arecibo during AIDA-89. J. Atmos. Terr. Phys., 1993, 55: 499～511

[5] [5] Namboothiri S. P., Tsuda T., Tsutsumi M. et al..Simultaneous observations of mesospheric gravity waves with the MU radar and a sodium lidar. J. Geophy. Res., 1996, 101: 4057～4063

[6] [6] Bills R. E., Gardner C. S.. Lidar observations of the mesopause region temperture structure at Urbana. J. Geophys. Res., 1993, 98: 1011～1021

[7] [7] Ai Yong, Lu Su, Zhang Xunjie. The measurements of the atmosphere at altitude of 30～100 km region by using lidar. Proceedings of Asia-Pacific conference on Environmental Electromagnatics, Xi’an, China, 1996. 160～163

[8] [8] Gardner C. S., Voelz D. G., Sechrist C. F. et al.. Lidar studies of the nigh time sodium layer over Urbana, Illinois, 1 seasonal and nocturnal variations. J. Geophys. Res., 1986, 91: 13659～13673