INSTRUMENT: PLANETARY RADIO ASTRONOMY RECEIVER
SPACECRAFT: VOYAGER 1
Instrument Id : PRA Instrument Host Id : VG1 Instrument Name : PLANETARY RADIO ASTRONOMY
RECEIVER Instrument Type : RADIO SPECTROMETER PI Name : JAMES W. WARWICK Build Date : UNK Instrument Mass : 7.700000 Instrument Height : UNK Instrument Length : UNK Instrument Width : UNK Instrument Manufacturer Name : MARTIN MARIETTA Instrument Serial Number : UNK
The Planetary Radio Astronomy (PRA) experiments' primary objective was to locate and explain kilometric, hectometric, and decametric radio emissions from the planets; to measure plasma resonances near the giant planets; and to detect lightning on the giant planets. The instrument was also successful at observing solar radio emissions from the perspective of the outer solar system.
Radio emissions can be used to determine the rate of rotation of the inner core of a planet, to determine the existence of a magnetic field, and to search for magnetic anomalies. Radio emissions are often the only remote diagnostic for interactions occurring in the portions of magnetospheres through which a spacecraft does not pass. This is particularly true for the inner magnetosphere, which usually goes unsampled.
Further information on the instrument and the investigations performed can be found in [WARWICKETAL1997].
The Voyager Planetary Radio Astronomy (PRA) instrument consisted of two superheterodyne receivers, one for the range from 1326.0 to 1.2 kHz (center frequency) and a second for the range 40.55 to 1.53 MHz (center frequency). The channels are numbered so that the lowest frequency channel (1.2 kHz) is channel number 198. Channels in the range 1 to 128 are referred to as 'high band', and the remaining channels as 'low band'. In low band, the channel spacing is 19.2 kHz. In high band, the channel spacing is 307.2 kHz.
The PRA receiver is driven by two orthogo