Abstract
A compact, all solid state riometer has been developed at the University of California, San Diego, in connection with a research program to study ionospheric absorption at high latitudes. The unit is particularly suitable for unmanned ground stations where reliability must be high and power consumption low.In the new units the thermionic diodes, which have been used traditionally as a reference noise source, have been replaced by low power planar silicon transistors. These have a good linear response and do not require any special power supplies. A regular sequence of calibrations has been arranged using logic circuitry so that the stability of the riometer can be monitored easily. A crystal clock is an integral part of the unit to maintain accurate timing. The system time constant has been set as low as 0.2 sec in order that rapidly changing details of absorption events can be studied with the instrument.
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