The thermal noise receiver (TNR) is designed to actively track the solar wind
plasma frequency. TNR consists of 5 overlapping bands. Each band covers
2 octaves, with the next band beginning at the mid point of the lower band.
The overall frequency range is 4 - 256 kHz. Usually the tnr is operated in a mode where the first (A), third and fifth bands are sampled, but occassionally
the instrument is driven by neural network software which tries to pick the one
band containing the plasma frequency. At the bottom are panels showing the
AGC level of each band and it can be determined from these just which mode
of operation exists. The main plot is in the form of a dynamic spectra
with intensity shown as a color bar. The units are db below a volt per
root Hz. For further details, contact
Mike Kaiser.