Measuring noise in magnetometers: An example using the Mars Global Surveyor magnetometers

Details Measuring noise in magnetometers: An example using the Mars Global Surveyor magnetometers Measuring noise in magnetometers: An example using the Mars Global Surveyor magnetometers

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11111208h&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue A11, CiteID A11208

Physics

Plasma Physics

1

Space Plasma Physics: Mathematical And Numerical Techniques (0500, 3200), Mathematical Geophysics: Instruments And Techniques, Planetary Sciences: Solid Surface Planets: Magnetic Fields And Magnetism, Planetary Sciences: Solar System Objects: Mars

Scientific paper

A recently developed data analysis tool allows direct measurement of the total root-mean-square noise in magnetometer data. Since the total is a combination of intrinsic instrument noise and solar wind magnetic field fluctuations, we can put upper limits on the instrument noise during periods of relatively quiet solar wind fields. The technique involves taking vector and scalar products of successive magnetic measurements; the resulting scalar quantity is insensitive to slow field variations as well as sudden ones (i.e., tangential discontinuities) and provides a measure of total noise. We illustrate this analysis by determining the noise levels for the Mars Global Surveyor magnetometer. Far from Mars and any obvious waves, we find that the magnetic field measurements noise level is +/-0.05 nT. This is consistent with the ground-based instrument's measured noise level of +/-0.01 nT expected under ideal conditions.

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