Yearly, Seasonal and Daily Variations of Radio Refractivity

M. Žilinskasa, b, S. Tamošiūnasb, c, M. Tamošiūnaitėb, c and M. Tamošiūnienėd aDepartment of Radio Communication, Communications Regulatory Authority of the Republic of Lithuania, Algirdo 27 A, LT-03219 Vilnius, Lithuania bFaculty of Physics, Vilnius University, Saulėtekio al. 9, LT-10222 Vilnius, Lithuania cInstitute of Applied Research, Vilnius University, Saulėtekio al. 9, LT-10222 Vilnius, Lithuania dSemiconductor Physics Institute, Center for Physical Sciences and Technology, A. Goštauto 11, LT-01108 Vilnius, Lithuania

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Yearly, seasonal and daily variations of radio refractivity have been analyzed. The method proposed in the recommendation of International Telecommunication Union ITU has been used. The local meteorological data have been used in calculation of radio refractivity. The highest values of the radio refractivity have been observed in Klaipėda (in Seacoast) in the year 2009. In July, the values of the radio refractivity were highest in all localities investigated here and over all the time of the day in the year 2009. In the continental part of Lithuania (in Vilnius and Kaunas), analysis of radio refractivity has been made by using the meteorological data of longer period (starting from April 2005 up to July 2010). Five-year meteorological data collected in February, April, July and October have been used. It was obtained that the values of refractivity in the year 2010 are much higher than ones obtained in all the years of the period investigated here.

DOI: 10.12693/APhysPolA.119.533 PACS numbers: 84.40.-x, 41.20.Jb