Modified gradiometer technique applied to Double Star (TC-1)
Zhang, T. L.; Takada, T.; Carr, C. M.; Brown, P.; Georgescu, E.; Fornaçon, K. -H.; Auster, H. U.; Eichelberger, H.; Gloag, J.
Germany, Austria, Japan, United Kingdom
Abstract
On TC-1 (Tan Ce 1), the equatorial spacecraft of the Double Star mission, a strong spin-synchronized magnetic interference from the solar panels was observed. In-flight correction techniques for spinning spacecraft that are based on minimizing spin tones in the spin-aligned component and in the magnitude of the ambient magnetic field are therefore not possible in this case. However, due to the fortunate situation that the spacecraft carries two flux-gate magnetometers on the same boom (at 0.5 m distance from each other), the spacecraft field effects could be removed from the spin-averaged data to achieve 0.2 nT relative accuracy, by using a gradiometer technique. Methodology and results are presented. The obtained accuracy allows the use of the data in multi-spacecraft studies together with the Cluster satellites.