Journal of Physical Studies 17(3), Article 3902 [9 pages] (2013) DOI: https://doi.org/10.30970/jps.17.3902 THE SOLAR ACTIVITY LEVEL DURING LONG-TERM AND DEEP MINIMUM OF CYCLES 23 AND 24 ITS INFLUENCE UPON THE TERRESTRIAL SYSTEM I. S. Laba{1}, L. M. Yankiv-Vitkovska{2}, P. G. Lisnyak{3}, I. Ya. Pidstryhach{1} {1}The Ivan Franko National University of Lviv, Astronomical Observatory, 8, Kyrylo and Mephodij Str., Lviv, UA--79005, Ukraine, e-mail: laba@astro.franko.lviv.ua {2}Lviv Polytechnic National University, Institute Geodesy, 12, Bandera Str., Lviv, UA--79013, Ukraine {3}V. Gnatyuk National Pedagogical University of Ternopil, 2, M. Kryvonosa Str., Ternopil, UA--46009, Ukraine

The level of Solar activity during long-term and deep minimum of 23rd and 24th cycles with its influence upon the terrestrial climatic system were explored according to the observational data of Astronomical Observatoty of the Ivan Franko national University of Lviv, the SORCE (Solar Radiation and Climate Experiment) space apparatus, several British climatic research centres and world INTERNET data base (ftp://ftp.ngdc.noaa.gov/SPP/SOLAR\_DATA) about Solar activity.

Typical peculiarities of the minimum of cycles 23/24 were studied at this paper. The transition period from January 2008 to July 2009 was characterized by first-sunspot activity reached the lowest values during the last 100 years; secondly the substantial asymmetry of the development of Solar activity at different hemispheres was discovered; and thirdly one may observe violations of synchronous changes of 11-year cycle and $T_{\rm glob.}$ prior to 1998.

The authors were find out two opposite acting factors after comparation of the data by British climatic centres about low level of Solar activity, the change of global temperature ($T_{\rm glob.}$) and substantial depletion of stratospheric ozone layer during the minimum of cycles 23/24. The substantially exhausted stratospheric ozone layer caused the aggrandisment of Solar energy which reached the terrestrial ground and so the low level of Solar activity was compensated. Therefore $T_{\rm glob.}$ remained sufficiently stable.

PACS number(s): 97.10.Ex

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