In this section
@article{Pudney:2013:10.5194/gi-2-249-2013,
author = {Pudney, MA and Carr, CM and Schwartz, SJ and Howarth, SI},
doi = {10.5194/gi-2-249-2013},
journal = {Geoscientific Instrumentation, Methods and Data Systems},
pages = {249--255},
title = {Near-magnetic-field scaling for verification of spacecraft equipment},
url = {http://dx.doi.org/10.5194/gi-2-249-2013},
volume = {2},
year = {2013}
}
TY - JOUR
AB - Magnetic-field measurements are essential tothe success of many scientific space missions. Outside ofthe earth’s magnetic field the biggest potential source ofmagnetic-field contamination of these measurements is emittedby the spacecraft. Spacecraft magnetic cleanliness is enforcedthrough the application of strict ground verificationrequirements for spacecraft equipment and instruments. Dueto increasingly strict AC magnetic-field requirements, manyspacecraft units cannot be verified on the ground using existingtechniques. These measurements must instead be takenclose to the equipment under test (EUT) and then extrapolated.A traditional dipole power law of −3 (with a fieldfall-off proportional to r−3) cannot be applied at these closedistances without risk of underestimating the field emitted bythe EUT, but we demonstrate that a power law of −2 is tooconservative. We propose a compromise that uses a powerlaw of −2 up to a distance equal to 3 times the unit size, beyondwhich a dipole power law can be applied. When extrapolatingfrom a distance of 0.20 m to 1.00 m from the centre ofa 0.20 m wide EUT, we demonstrate that this method avoidsan under prediction of the field, and is at least twice as accurateas performing the extrapolation with a fixed power lawof −2.
AU - Pudney,MA
AU - Carr,CM
AU - Schwartz,SJ
AU - Howarth,SI
DO - 10.5194/gi-2-249-2013
EP - 255
PY - 2013///
SN - 2193-0864
SP - 249
TI - Near-magnetic-field scaling for verification of spacecraft equipment
T2 - Geoscientific Instrumentation, Methods and Data Systems
UR - http://dx.doi.org/10.5194/gi-2-249-2013
UR - http://hdl.handle.net/10044/1/41849
VL - 2
ER -