Abstract
Electron temperatures measured by the AEROS retarding potential analyzer (RPA) and by the TAIYO electron temperature probe are compared when both satellites were close to each other. The selected data are in the height range 250 to 400km. During local nighttime good agreement is obtained between the measurements of both satellites. This allows to derive temperature gradients with respect to the altitude profile and the increase at sunrise. At daytime the temperatures from TAIYO are, on the average, 10% higher than from AEROS.
