A COMPARISON STUDY BETWEEN THE GEOMAGNETIC ELEMENTS VALUES AS RECORDED AT MIDDLE AND HIGH LATITUDES GEOMAGNETIC OBSERVATORIES DUE TO NOVEMBER 7-12, 2004 GEOMAGNETIC STORM

Document Type : Original Article

Authors

1 National Research Institute of Astronomy and Geophysics (NRIAG), Helwan-Cairo, Egypt.

2 National Research Institute of Astronomy and Geophysics (NRIAG), Helwan-Cairo, Egypt

3 Tanta University, Geophysical Dept., Tanta-Egypt, mekkawi05@yahoo.com

Abstract

The storms are intervals of time with a sufficiently intense and long-lasting interplanetary convection electric field leads, through a substantial injection of energy into the magnetosphere-ionosphere system, to an intensified ring current, strong enough to exceed some key threshold of the quantifying storm time Dst index. An active solar flare from region 696 of the Sun has produced three CME’s that caused interaction with the Earth’s magnetosphere. Two of the three CME passages encountered strongly the Earth’s magnetosphere produced storm activity that resulted in Geomagnetic Induced Currents (GIC) observations.
The main target of this work is to study the behavior and hazard effects of November, 2004 magnetic storm on the Earth’s magnetic field, and in generating (GIC) at high and middle latitudes areas. In this respect, we use magnetic data derived from more than six Geomagnetic Observatories in the analyses. Also, the sunspot numbers, A-index and Dst-index are considered. The results indicate that the peaks of the Dst reached about -383 nT, the A-index about 153 nT, and the average sunspot number reaches about 34.3 (2). The analysis indicates that the average differences of the magnetic components (H, D and Z) between high latitude regions (60º to 90º North) and mid-latitudes (20º to 60º North) reach about 1100, 700 and 1100 nT respectively towards high latitude regions. This leads to generate GIC at high Latitude areas about three times of its magnitude at the mid-Latitude areas

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