Physics – Space Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003adspr..32.2335w&link_type=abstract
Advances in Space Research, Volume 32, Issue 11, p. 2335-2342.
Physics
Space Physics
Scientific paper
Calibration of scientific instruments is an important task. Only by proper calibration and understanding of the instrument can we address the scientific questions. Unfortunately, in the field of space plasma physics calibration is not considered science and therefore, calibration techniques and results are often not reported in the space physics literature. This paper reviews how in-situ particle instruments for plasma measurements are calibrated in the laboratory and in flight. Absolute calibration traceable to a national measurements institute is very difficult to achieve. A calibration transfer standard is suggested to reduce relative differences of individual calibration facilities with each other. Instrument degradation is of particular concern for long-term studies, but there is no inflight calibration standard either. Cross calibration with other instruments on the same spacecraft is described. In order to speed up the calibration for multi-spacecraft missions, several methods ranging from artificial intelligence methods, numerical ray tracing to improved vacuum chamber pump speed are suggested. In summary, there is a need for further improvements in the area of instrument calibrations, especially in light of the up-coming multi-spacecraft missions or for long-term studies of solar cycle effects.
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