Lidar observations of a lot of sporadic sodium layers in mid-latitude

Details Lidar observations of a lot of sporadic sodium layers in mid-latitude Lidar observations of a lot of sporadic sodium layers in mid-latitude

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..263n&link_type=abstract

Geophysical Research Letters, Volume 22, Issue 3, p. 263-266

Physics

27

Atmospheric Composition And Structure: Thermosphere-Composition And Chemistry, Ionosphere: Midlatitude Ionosphere, Meteorology And Atmospheric Dynamics: Thermospheric Dynamics

Scientific paper

We have routinely observed mesospheric Na layers since November 1991 with a Na ground-based lidar above Tokyo Metropolitan University (TMU) at Hachioji, Tokyo (35.6°N, 139.4°E) in mid-latitude. In the past, the sporadic Na layers have been observed commonly at low- and high-latitude lidar sites [Kwon et al., 1988; Batista et al., 1989; von Zahn et al., 1987] but rarely observed at mid-latitude sites [Senft et al., 1989]. Contrary to expectations, we could observe more than 100 events of the sporadic Na layers for two years from November 1991 until October 1993 in this mid-latitude lidar site, and the large sporadic Na layers had been observed especially during spring and summer. Most of these events were accompanied by sporadic E layers and the most enhancement of the sporadic E layers preceded that of the sporadic Na layers by 15 to 30 minutes.

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