International Journal of Environmental Sciences

Volume 2 Issue 3 2012           Pages:1807- 1817

Solar and Geomagnetic activity effects on Egypt’s climate

Author Information:

El Mallah, E.S, Abdel-Halim.A.A and Thabit. - Basic & Applied Sci. Dept., College of  Engineering, The Arab Academy for Science and Technology and  Maritime Transport, P.O. 1029, Alexandria, Egypt.

El-Borie.M.A. -Physics Dept., Faculty of Science, Alexandria University, P.O. 21511, Alexandria, Egypt.

We investigate the effects of solar/geomagnetic activities on the surface air temperature of Egypt. We used the monthly sunspot numbers, solar flare and flux, total solar irradiance and geomagnetic disturbances as solar and geomagnetic activity indicators. We considered monthly Egypt surface air temperature (ESAT) throughout the period 1881-2009, which covers 12 solar activity cycles. We found a negative correlation between ESAT and solar geomagnetic indices, as well as a positive correlation with total solar irradiance for the entire data set. We found that the sign of the correlation between ESAT and Rz depends on North–South sunspot area, being positive when the Northern solar hemisphere is predominantly more active, and negative when more active is the southern hemisphere except for the cycle 13. The power spectra analyses have been applied to obtain the spectrum-cyclic behavior of ESAT, as well as for other parameters. The most pronounced power peaks were found around periods of 25.6, 8.0, 5.6, 4.1, 2.7, 2.3 years, indicating a remarkable role of solar/geomagnetic activities on Egypt’s temperatures. We concluded that the signature of solar activity effect may exist on surface air temperature of Egypt.

Keywords : Sun-climate interaction, Regional surface air temperature and global warming, geomagnetic activity, solar activity cycle, Solar indices, Sunspot number.

DOI: 10.6088/ijes.00202030064

© 2012 Copyright El Mallah et al, licensee IPA.This is an open access article distributed under the Creative Commons Attribution License (2.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The electronic version of the article can be downloaded below.

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