Resonant scattering in the thermosphere as an indicator of superthermal electron precipitation
V.V. Bychkov, I.N. Seredkin
Institute of Cosmophysical Research and Radio Wave Propagation of the Far-Eastern Branch of Russian Academy of Science, Kamchatka region, Elizovskiy district, Paratunka, Russia
Keywords: атмосфера, ионосфера, лидар, зондирование, рассеяние, atmosphere, ionosphere, lidar, sounding, scattering
Abstract
The results of dual-frequency lidar sensing of the atmosphere at the Kamchatka lidar station (52°58¢17¢¢ N, 158°15¢07¢¢ E) are presented. The scattering signals were recorded in the altitude range 25-600 km. Lasers with radiation at wavelengths of 532.08 nm and 561.106 nm were used. The aerosol formation in the middle atmosphere and resonance scattering by excited atomic nitrogen and oxygen ions in the upper atmosphere were researched. Pronounced light-scattering layers were found at altitudes of 200-400 km. Their appearance is due to the presence of excited states of atomic oxygen and nitrogen ions. The difference in signal values at two wavelengths is discussed. A signal generation mechanism is proposed, and signal values at different wavelengths are estimated.
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