Cairo University

MTPR Journal


Empirical Study of Solar activity indicators, Halo CME and North Atlantic Oscillations for the 22nd & 23nd solar Cycles

M. Farghaly 1; S. Yousef 2,A. Tharwat 3
1. National Researches Institute for Astronomy and Geophysics, Department of solar and Space
researches, Egypt,
2. Cairo University, Faculty of Science, Department Of Astronomy and Meteorology, Egypt,
3. American University in theEmirates, College of business administration, UAE,

Vol./Issue: 19 , id: 295

Influence of solar variability on the Earth’s climate requires studding solar interactions, and mechanisms that explain the response of the Earth’s climate system. The NAO (North Atlantic oscillation) is considered as one of the most dominant modes of global climate variability. Like El Niño, La Niña, and the Southern Oscillation, it is considered as free internal oscillation of the climate system not subjected to external forcing. It is shown, to be linked to energetic Solar eruptions. Surprisingly, it turns out that features of solar activity have been related to El Niño and La Niña, also have a significant impact on the NAO. A substantial portion is associated with the North Atlantic Oscillation (NAO), a hemispheric meridional oscillation as atmospheric mass with centers of action near Iceland and over the subtropical Atlantic. Sunspots area and coronal mass ejections (CMEs) are from the most important solar events as far as space weather effects are concerned, linking solar eruptions, major interplanetary disturbances, and geomagnetic storms. A halo CME, which is usually associated with activity near the solar disk center, has great influence on space weather because an Earthward halo CME is indicative of coronal mass and magnetic fields moving out toward the Earth, therefore likely to cause geoeffective disturbances. In this work different statistical toolswere implemented to investigate the interrelationships among sun spots area and halo coronal mass ejections (HCMEs) with NAO index on the solar cycles 22,23, the results were discussed to show their dependency which consequently can be used to predict the behavior of NAO index in the next solar cyclesusing as an indicator to climatic variability.