Abstract
It is a clear fact that the Earth's climate has been changing since the pre-industrial era, especially during the last three decades. This change is generally attributed to two main factors: greenhouse gases (GHGs) and solar activ ity changes. However, these factors are not all-independent. Furthermore, contributions of the above-mentioned factors are still d isputed. The aim of th is paper is relation in the longer t ime (1880-2011), between changer of g lobal surface temperature (GST), and solar geomagnetic activ ist represented by sunspot number (Rz) and geomagnetic indices (aa , Kp ), and to what degree they are connected. The geomagnetics aa are more effect ive on global surface temperature than solar activity. Furthermore, the global surface temperature are strongly sensitive to the 21.3-yr, 10.6-yr, and 5.3-yr variations that observed in the considered geomagnetic and sunspot spectra. The present changes in aa geo magnetics may reflect part ially some future changes in the global surface temperatures.
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