A Danish Microsatellite With a High Scientific Profile
Yamashita, S. (1), T. Iyemori (1), S. Nakano, T. Kamei (1), and T. Araki (1)
Abstract. From the precise magnetic field measurements by the Oersted satellite at low-altitudes over various local time, a distinct spatial variation at mid- and low- latitudes was detected on the dayside in the eastward component residual (DELTA BPHI) after the subtraction of the geomagnetic main filed model. The eastward residual on the dayside clearly shows the existence of the inter-hemispheric field-aligned currents at mid- and low- latitudes (between about 50° S and 50° N). The inter-hemispheric field-aligned currents are confirmed to be flowing from the summer hemisphere to the winter hemisphere in the morning, and are flowing from the winter hemisphere to the summer one around the noon and in the evening. The ground-based geomagnetic data of low latitude stations is also used to examine the effect from the inter-hemispheric field-aligned currents. The existence of the inter-hemispheric field-aligned currents are confirmed also from the ground-based geomagnetic data. The current intensity of the inter-hemispheric field-aligned currents in the evening may be small comparing with the inter-hemispheric field-aligned currents in the morning and around the noon.