Low-frequency radioastronomical observations during the Spacelab 2 plasma depletion experiment

Observations of the galactic background radio emission at a number of frequencies between 2.75 MHz and 0.51 MHz were made in association with the plasma depletion experiments of Spacelab-2 of August 5, 1985, to test the concept of making low frequency observations through an artificial window. Following the Shuttle OMS (Orbital Manoeuvring System) burn at a time when foF2 (maximum Frequency of radiowaves that can penetrate the ionosphere) was 1.99 MHz, a decrease in the maximum ionospheric electron density of approximately 30% occurred. The first observations of the radio emission at 1.704 MHz at high galactic latitudes with good angular resolution (25 degrees) were made during this event