A study of geomagnetic anomaly during I.G.Y.

Physics

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Scientific paper

In this paper, we have studied the geomagnetic anomaly in the F2-layer on quiet and disturbed days for the months of March and September during the year 1958. The data for stations in the Asian, American and African zones have been studied separately. The diurnal variation of the width of the anomalous belt and the depth of the equatorial trough have been determined for the three zones separately. The analysis indicates that the belt develops earlier in the Asian zone than in the American or African zones and there is a marked asymmetry in the variations in the northern and southern latitudes in the Asian and American zones. While there does not appear to be much difference in the width of the belt on quiet and disturbed days, there is a definite decrease in the depth of the trough on disturbed days as compared to that on quiet days. The width of the belt in the Asian zone is generally larger than that in the American zone. The general features observed here are in line with the ideas of meridional transport of ionization and abnormal increase in the thickness of the F2-layer at equatorial regions. There is some evidence of inhibition of the meridional transport of ionization on disturbed days.

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