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Research Journal of Environmental Sciences

Year: 2011 | Volume: 5 | Issue: 4 | Page No.: 316-328
DOI: 10.3923/rjes.2011.316.328
Regional Climate Interaction with the Solar and Geomagnetic Activities
E. Shafik Elmallah

Abstract: In this study, we investigate the effects of solar-geomagnetic activity on the annual surface air temperature anomalies recorded in Egypt. The temperature of Egypt is divided into two main zones, north of Egypt NE (Mediterranean coastal) and south of Egypt SE (Upper Egypt) on the Nile river. Linear trends are calculated for each zone as an entire record and after segmented into different periods. Cross correlation as well as partial correlation between each solar-geomagnetic index and both NE and SE are applied. Finally spectral and coherency analysis are employed to know the periodicities and the variation that have similar spectra properties. Present results reveal a slight warming trend for the whole record on both NE and SE, but sequences of warming and cooling with different trends have been observed. Significant higher warming trend are detected on SE than NE at the last three decades. Negative correlations between solar-geomagnetic activity indices and SE at lag (1-3 years) were observed. In addition it was found that the solar indices are more effective on the relation (geomagnetic activity-NE), while geomagnetic indices have small effect on the correlation between solar activity and both NE and SE. Regarding the periodicities of the series, several cycles have been identified, with periods of about 50, (20-25), 10 year and (2-3) years. These may indicate that there is solar activity effect on local temperature.

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How to cite this article
E. Shafik Elmallah , 2011. Regional Climate Interaction with the Solar and Geomagnetic Activities. Research Journal of Environmental Sciences, 5: 316-328.

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