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Two types of data sets for investigation of solar- modulated cycles in theclimate of Bulgaria during the last ~ 200 years has been used in this study: 1.Instrumental data for the rainfalls and temperatures in 26 stations during theperiod AD 1899-1994; A smoothing dendrochronological data series of the treerings width of a beech sample (Fagus) for the period of AD 1780-1982. The dataproceedings has been provided separately for the "winter" (November-April) and"summer" (May-October) half- years. A well expressed quasi-20-22 and 54 yrcycles in the rains and temperature instrumental "summer" series as well asquasi 11yr cycle for the "winter" temeperature data has been established forthe studied period 1899-1994. However there are also very serious variations ofthe 11 and 22 yr cycle magnitudes. The quasi 20-22 yr ("summer") cycle is weakexpressed before AD 1930, while the 11 yr (winter) cycle is faded rapidly after~AD 1975/76. The existence of 20-22 yr climatic cycle could be traced since theend of the supercenturial solar Dalton minimum (AD 1795-1830) in the beech treering width series. Strong cycles by duration of 54, 67 and 115 years are alsofound in this series. All they have solar analogs (in the coronal activity aswell as in the "cosmogenic" 10Be and aurora activity data series). Extremelittle tree ring widths during the Dalton minimum has been detected.

The climate of Bulgaria during 19th and 20th centuries by instrumental and indirect data : Solar modulated cycles and their evolution