抄録
Metallic layers, containing such elements as Na, K, Li, Ca, and Fe, originating from meteors are valuable
tracers for performing observations of the Earth’s upper atmosphere. The present paper provides a
brief review of resonance-scattering lidars, which use laser remote-sensing technology to detect the metals
occurring in these layers. In particular, two resonance-scattering lidars are introduced. The first is a
highly-stable Na resonance-scattering lidar, which is easily handled even by novices. The other is a frequency-
tunable resonance-scattering lidar, that enables observations of three different metallic species: K,
Fe, and Ca+. The recent studies using these lidars are described.
