Abstract
The Alouette II and Explorer XXXI satellites were placed in orbit by a single launch vehicle and separated. Cylindrical electrostatic probes of identical design were installed on each satellite in part to test the effects of the long sounder antennas and large radio-frequency power on Alouette II upon direct measurements of the thermal electrons and ions. Comparisons of the early data, taken when the satellites were separated less than 1000 km along their common orbit, suggest that there is no inherent incompatibility between the sounder experiment and direct measurement experiments. The electron temperature T <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">e</inf> and concentration N <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">e</inf> derived from the two experiments generally agree to better than 10 percent, although unexplained differences of up to 15 percent in T <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">e</inf> and 40 percent in N <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">e</inf> have been found on rare occasions.
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