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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2024, Vol. 21, No. 4, pp. 263-274

Formation of resonant scattering on excited ions of oxygen and nitrogen atoms in lidar studies of the atmosphere

V.V. Bychkov 1 
1 Institute of Cosmophysical Researches and Radio Wave Propagation FEB RAS, Paratunka, Russia
Accepted: 08.07.2024
DOI: 10.21046/2070-7401-2024-21-4-263-274
The results of the analysis of lidar data obtained in Kamchatka (53° N, 158° E) in 2008–2022 are presented. Atmospheric sounding was carried out in the altitude range of 25–600 km at wavelengths 532 and 561 nm. The appearance of increased scattering in the altitude range of 200-400 km was detected. It is shown that it is caused by resonant scattering on excited ions of nitrogen and oxygen atoms. Under night conditions, such ions are created in the process of ionization of the main gas components of the atmosphere during the precipitation of energetic electrons. It is shown that the process of excitation of ions in the ground state does not play any significant role in the formation of the lidar signal. Resonant scattering at these altitudes appears in the process of ionization of the main gas components — N2, O2, O. A mechanism for the formation of a lidar signal of resonant scattering on excited ions is proposed. A general scheme is proposed for assessing the potential efficiency of laser radiation when choosing a wavelength for lidar research of the atmosphere. The meaning of the scattering coefficient in the thermosphere is discussed.
Keywords: atmosphere, ionosphere, lidar, scattering
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