The paper offers a partial view of the results of analysing the orbits of the first satellites, particularly Sputniks 1 and 2. The topics discussed include the zonal harmonics in the Earth’s gravitational field and three features of the upper atmosphere — the air density and its variations; the scale height and temperature; and the zonal winds.
KeywordsSolar Wind Solar Activity Interplanetary Magnetic Field Geomagnetic Activity Secular Variation
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