Исследования Земли из КосмосаИсследования Земли из Космоса0205-9614The Russian Academy of Sciences1427410.31857/S0205-961420193104-112Research ArticleComparison of various models of supercooled water loss factor with experimental data at microwavesBordonskiyG. S.lgc255@mail.ruOrlovA. O.lgc255@mail.ruInstitute of Natural Resources, Ecology and Cryology, Siberian Branch of the Russian Academy of Sciences20062019310411220062019Copyright © 2019, Russian academy of sciences2019<p style="text-align: justify;">An improved formula for the supercooled water loss factor at frequencies 10180 GHz in the temperature range 0 ... 70 C is presented. The formula based on the experimental data obtained by the authors on measurements of attenuation in the pore water of silicate materials. The formula contains two terms connected the Debye dependence of the loss factor on frequency and temperature, and non-Debye, determined by the influence of the second critical point of water. Comparison of the proposed formula and the model formulas of other authors is carried out. A significant discrepancy between the calculation results (at several times) of the loss factor at frequencies above 100 GHz and temperatures below 30 C has been founded. The model based on the measurements provides the most adequate representation of the behavior of the loss factor with an error of ~ 30% in the area of deep supercooling of water and in the upper part of the studied frequency band.</p>supercooled watermicrowavesloss factor modelssecond critical point of waterferroelectric ice 0переохлажденная водамикроволновый диапазонмодели фактора потерьвторая критическая точка водысегнетоэлектрический лед 0[Anisimov M.A. Cold and supercooled water: a novel supercritical-fluid solvent // Russ. J. Phys. Chem. B. 2012. V. 6. № 8. P. 861–867.][Basharinov A.E., Kutuza B.G. 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