Abstract

The behavior of two types of Langmuir probes has been compared on two rocket flights. One type of probe had electrodes made of low-sulfur stainless steel and the other had electrodes made of aluminum coated with Aquadag. Each rocket payload included one Langmuir probe of each type. The electron temperatures measured with the stainless-steel electrodes were about 15% higher than the electron temperatures measured with the Aquadag-coated electrodes at 150 km on ascent and about 10% higher at 180 km. These results imply that the use of Aquadag coated electrodes, or electrodes of other carefully chosen materials, permits greater reliability in the measurement of electron temperatures in the ionosphere by the Langmuir probe technique.

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