The Influence of the Climatic Peculiarities on the Electromagnetic Waves Attenuation in the Baltic Sea Region

Abstract

The peculiarities of the climatic conditions in the Baltic Sea Region are reviewed. According to the values of rain rates measured in the Lithuanian Weather Stations with the 10minute's integration time, a relation between the rain rate and the annual precipitation has been derived. The model for one-minute rain rate calculation on the months starting from May up to September in Lithuania has been presented. The values of the electromagnetic waves attenuation due to the rain have been determined. The cloud attenuation has been computed by using the meteorological data measured at the ground level. The semi empirical method has been used. The values of the specific attenuation under conditions of cloud cover have been determined.

Atmospheric Attenuation due to Humidity

“…country, city, climatic region). First attempts to predict the rain attenuation under Baltic region climate conditions are described in (Tamošiūnas et al, 2005(Tamošiūnas et al, , 2006Ivanovs & Serdega, 2006;Zilinskas et al, 2006Zilinskas et al, , 2008. It was mentioned in (Ivanovs & Serdega, 2006), that rain events produce unavailability of microwave link, which sometimes lead operators to economical losses or even license loosing.…”

Quasi-optical Systems Based on Periodic Structures

“…country, city, climatic region). First attempts to predict the rain attenuation under Baltic region climate conditions are described in (Tamošiūnas et al, 2005(Tamošiūnas et al, , 2006Ivanovs & Serdega, 2006;Zilinskas et al, 2006Zilinskas et al, , 2008. It was mentioned in (Ivanovs & Serdega, 2006), that rain events produce unavailability of microwave link, which sometimes lead operators to economical losses or even license loosing.…”

“…This factor must be considered when analyzing rain attenuation and cloud attenuation. Our first attempt to determine the specific cloud attenuation under the Lithuanian climatic conditions is presented in (Tamošiūnaitė et al, 2008;Zilinskas et al, 2008). The humid weather predominates over the year in Lithuania.…”

“…In (Zilinskas et al, 2008) another model (4) for calculation of the (1 min.) R -value was presented.…”

“…It was noted in (Priestley & Hill, 1985;Kablak, 2007) that even small changes of temperature, humidity and partial water vapour pressure lead to changes in the atmospheric refractive index. In (Zilinskas et al, 2008), the measurements of these meteorological parameters were analyzed in the different time of year and different time of day. The values of the refractive index have been determined by using measured meteorological data.…”