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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 115,
A06102,
11 PP., 2010
doi:10.1029/2009JA014714
Prediction of background levels for the Wind WAVES instrument and implications for the galactic background radiation
School of Physics, University of Sydney, Sydney, New South Wales, Australia
School of Physics, University of Sydney, Sydney, New South Wales, Australia
School of Physics, University of Sydney, Sydney, New South Wales, Australia
School of Physics, University of Sydney, Sydney, New South Wales, Australia
NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
We investigate and predict the observed background levels for the TNR, RAD1, and RAD2 receivers when connected to the X, Y,
and Z antennas of the WAVES instrument on the spacecraft Wind. The receivers are connected to either a single antenna, in
“SEP” mode, or a combination of antennas, in “SUM” mode. With the TNR receiver in SEP (X) mode, the predicted backgrounds
agree to within 20% when modeled using a two component model for the quasi-thermal plasma noise (QTN). Calibrating the RAD1
in SEP (X) mode observations against TNR allows us to calculate the relative receiver gain GR1 = 1.43 ± 0.18. Using the RAD1 data in SUM (X+Z) mode, the ratio of antenna gains is found to be R = 6.5, in agreement with preflight measurements. Observed differences between the SEP (X) and SUM (X+Z) modes are explained
for the first time, and the predicted levels of QTN and galactic background are found to agree to within 20%. RAD2 is also
calibrated against RAD1 and TNR, yielding a total gain GR2Gy = 2.5 ± 0.3. Differences between the predicted and observed galactic background spectra are used to estimate the effective
antenna lengths for the X and Y antennas, which are found to be between the physical monopole antenna length L and the Hansen (1981) prediction of 
L. The analyses are consistent with the Novaco and Brown (1978) galactic background model, which decreases much faster than
that of Cane (1979). Our model background spectrum is useful for theory-data comparisons of type II and III bursts.
Received 3 August 2009; accepted 12 January 2010; published 2 June 2010.
Citation: (2010), Prediction of background levels for the Wind WAVES instrument and implications for the galactic background radiation, J. Geophys. Res., 115, A06102, doi:10.1029/2009JA014714.
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