Meteorological Data and Spectral Analyses of Non-Equilibrium Processes in Water during the Total Solar Eclipse of 11.08.1999 in Bulgaria


  • I. Ignatov Scientific Research Center of Medical Biophysics
  • M.T. Iliev Faculty of Physics, Sofia University “St. Kliment Ohridski”
  • T.P. Popova University of Forestry, Faculty of Veterinary Medicine
  • G. Gluhchev Institute of Information and Communication Technologies, Bulgarian Academy of Sciences (BAS)
  • P.S. Gramatikov Department of Green Energetics, European Polytechnical University, Physics Department, South-West University “Neofit Rilski”
  • P. Vassileva Institute of General and Inorganic Chemistry (IGIC), Bulgarian Academy of Sciences (BAS)



solar eclipse, meteorological parameters, NES, DNES


There are partial or total solar eclipses every year on our planet. They are observed from relatively small areas. From 1950 to 2100, three total solar eclipses fell within the territory of Bulgaria. The two solar eclipses from the 20th century were observed on 15.02.1961 and 11.08.1999. The next total solar eclipse will happen on 3.09.2081. The partial solar eclipses in Bulgaria were on 3.10.2005, 29.03.2006, 1.09.2008, 4.01.2011, and 25.10.2022. The question of the influence of solar eclipses on the Earth’s atmosphere, water, and living organisms is an area of interest for many researchers. In this connection, studies have been conducted on atmospheric and water parameters during partial and total solar eclipses. Most investigations were performed with meteorological data – temperature and humidity. In the last 30 years, other methods have also been applied for the investigations of solar eclipses – spectral methods with infrared (IR) spectroscopy, studies of magnetic and electric fields, polarization, and measurements of the parameters of the fluids in plants. Our studies have used meteorological methods and analyses. For the effects on the water, spectral methods are applied to the non-equilibrium energy spectrum (NES) and differential non-equilibrium spectrum (DNES). A deionized water sample examined during the solar eclipse on 11.08.1999 was used, aiming to analyze the parameters of NES and DNES. The deionized water control sample was tested on 10.08.1999 at the same time as the solar eclipse of the next day. The results of our research show relatively rapid and significant changes in air parameters during a solar eclipse, which are most prominent immediately after its culmination. The conditions of non-equilibrium arising during the solar eclipse allow for studying the restructuring of the hydrogen bonds of water molecules. The results of the current studies prove that the solar eclipse’s significantly affect water which is the primary substance in the Nature and living organisms. These data are consistent with other ones which also prove that, during a solar eclipse, the structure of water undergoes significant changes. By influencing the water, this natural phenomenon affects the whole Nature and all living organisms on the planet.


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How to Cite

Ignatov, I., Iliev, M., Popova, T., Gluhchev, G., Gramatikov, P., & Vassileva, P. (2024). Meteorological Data and Spectral Analyses of Non-Equilibrium Processes in Water during the Total Solar Eclipse of 11.08.1999 in Bulgaria. Ukrainian Journal of Physics, 69(2), 96.



Physics of liquids and liquid systems, biophysics and medical physics