Daily Variation of the Geomagnetic Field and the Deformation of the Magnetosphere

Abstract

IT is well known that at low latitudes the horizontal component of the geomagnetic field has a maximum Hmax around local noon and a minimum value Hmin between 1800 and 0600 h local time. The range of the daily variation ΔH is strikingly enhanced in the region ±3° geomagnetic latitude due to the electro jet current in the E-region. We have been interested in verifying whether at a low latitude station outside the influence of the electrojet, ΔH represents an increase on the day side over a base level at Hmin, or alternatively it is a decrease on the night side from a base level at Hmax. In the former case, we should have a positive correlation between ΔH and Hmax, with poor correlation between ΔH and Hmin. On the other hand, in the latter case, we should get a negative correlation between ΔH and Hmin and a poor correlation between ΔH and Hmax.

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SARABHAI, V., NAIR, K. Daily Variation of the Geomagnetic Field and the Deformation of the Magnetosphere. Nature 223, 603–605 (1969). https://doi.org/10.1038/223603a0

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