Light & Engineering 33 (5) 2025

Volume 33
Date of publication 10/20/2025
Pages 119–125

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Water Surfaces Microwave Radiation at 15 GHz: Application in Remote Sensing and Radiometry L&E, Vol.33, No.5, 2025

Articles authors:

Sergey N. Gavrilin, Nataliya A. Parfentyeva, Evgeniy R. Burmistrov

Sergey N. Gavrilin, Ph. D. of Physical and Mathematical Sciences (1990, IRE RAS). He graduated from MIPT in 1987. At present, Associate Professor of the Department of General and Applied Physics at the National Research University MGSU. He has more than 20 scientific papers. His research interests: radiation transfer, magnetic crystals, aerosols, thermal radio emission

Nataliya A. Parfentyeva, Ph. D. of Physical and Mathematical Sciences. She graduated from the Faculty of Physics of Moscow State University. She is a Head of the Department of General and Applied Physics at NRU MGSU. She is the author and co-author of more than 25 textbooks, problem books, and manuals on physics, and under her editorship Physics textbooks for grades 10–11 are published. She regularly conducts webinars on physics for teachers at the Prosveshchenie publishing house. She has more than 200 scientific papers. Her research interests: theoretical hydromechanics, physics of aerosols, theory of heat and mass transfer. He holds the title of “Honorary Worker of Higher Professional Education of the Russian Federation”, she is a Member of the Moscow Society of Nature Explorers

Evgeniy R. Burmistrov, physicist. He graduated from and completed his post-graduate studies at the Physics Faculty of Lomonosov Moscow State University. He is a lecturer at the Department of General and Applied Physics of the National Research University MGSU and the author of over 17 scientific papers. His research interests include pulsed terahertz spectroscopy, polar liquids, photoconductive antennas, and the interaction of radiation with matter

Abstract:

The electromagnetic radiation from fresh and saltwater (18 %) surfaces at a frequency of 15 GHz was experimentally studied over the temperature range of (30–50) °C. It is shown that the dependence of the radiation power on temperature is linear, with the temperature gradient for fresh water (0.107 rel. units / °C) being greater than that for the saline solution (0.077 rel. units / °C). For this frequency range, fluctuations in radiation power were recorded for the first time at approximately 30 °C, which are presumably associated with the disappearance of the “light” water fraction. A corresponding theoretical analysis was performed using the laws of ray optics (Snell’s law) and the model of Stogryn for the dielectric constant. It was established that the radiation is formed within a surface temperature film, which thickness exceeds the skin depth. It is shown that the difference in the radiation power of fresh and salt water cannot be explained solely by the difference in their emissivity, indicating the influence of the vertical temperature distribution in the surface layer. The results of the study are important for understanding the heat exchange processes at the water – atmosphere interface and for developing methods for the remote monitoring of water bodies.

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Keywords

DOI: https://doi.org/10.33383/2025-044

Article in RUS:
Svetotekhnika # 5, 2025

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