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Long-Term Trend of Noctilucent Cloud Altitude Detected: A Comparison of Positional Data with Historical Measurements
Oleg S. Ugolnikov, Ilya S. Yankovsky, Maxim V. Klimenko +3
A large number of photometric and photographic position data of noctilucent clouds (NLC) obtained at 54-61 deg N, 29-50 deg E in 2020-2026 is used, comprising about 20,000 individu…
Three-Dimensional Velocity Analysis and Particle Size Dynamics from Multi-Site RGB-Photometry of Noctilucent Clouds
Oleg S. Ugolnikov, Olga Yu. Golubeva, Egor O. Ugolnikov
A method for measuring the altitude and particle size of noctilucent clouds, based on positioning and photometry from wide-angle three-color cameras, has been developed to determin…
Noctilucent Clouds Modulated by Strong 5-day Planetary Wave in 2025: Amplitudes, Phases and Altitudes Based on Ground-Based Observations and Satellite Temperature Data
Oleg S. Ugolnikov, Ilya S. Yankovsky, Nikolay N. Pertsev +12
During the summer season of 2025, noctilucent clouds (NLC) were observed at the latitudes 55-60N from the late May until the late August. A distinct 5-day periodicity in their occu…
Five-years Altitude Statistics of Noctilucent Clouds Based on Multi-Site Wide-Field Camera Survey
Oleg S. Ugolnikov, Nikolay N. Pertsev, Vladimir I. Perminov +14
The results of simultaneous measurements of noctilucent clouds (NLC) position in a number of ground-based locations are presented. Observational data of 14 bright NLC events over 5…