Dependence of main phase range of H component on Latitudes for Great Magnetic Storms

Physics

Scientific paper

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2788 Magnetic Storms And Substorms (7954)

Scientific paper

We compared the main phase range of H component recorded by ground-based geomagnetic observatories with different latitudes but nearly same geomagnetic longitude during several great storms with Dst < -300nT. The data both from magnetic chain in eastern China and in Central America were analyzed. The result derived from the magnetic data recorded by the magnetic chain in eastern China shows that the magnetic disturbance was strongest in the northernmost observatory MZL but not in QGZ which is nearest to equator during several great storms. The result from magnetic chain in Central America is more complicated. The above-mentioned does not agree with the common knowledge that the recorded main phase range of H component decreases with increasing latitude because magnetic field variation is caused mainly by symmetry equator ring current during storms, especially during main phase of storms. The result indicates that the responsible current systems during great storms are really complicated, and we try to find the possible current to explain our result.

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