Abstract
Total density data based on CACTUS microaccelerometer measurements — carried out between 400 and 600 km altitudes at low latitudes in a quiet solar activity period (1975–1977) — have been compared to corresponding MSIS'86=CIRA'86 model values. The differences proved to be a double valued function of Kp but a single valued one of Dst. The residuals are a function of local solar time (LST), of geomagnetic latitude ( ϕ geom) and of the intensity of geomagnetic activity respectively. A new geomagnetic term is presented to replace the Kp dependent term in the otherwise unchanged model. The improved MSIS (iMSIS) model represents the observations better and hints more directly at the physical background of the geomagnetic phenomenon in the equatorial zone.
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