Synergies between the MagNet/NetLander experiment and a magnetic experiment onboard an orbiter
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Orbiter
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Two accelerometer systems, the Orbital Acceleration Research Experiment and the Space Acceleration Measurement System, were used to measure and record the microgravity environment of the Orbiter Columbia during the STS-87 mission in November-December 1997. Data from two separate Space Acceleration Measurement System units were telemetered to the ground during the mission and data plots were displayed for investigators of the Fourth United States Microgravity Payload experiments in near real-time using the World Wide Web. Plots generated using Orbital Acceleration Research Experiment data (telemetered to the ground using a tape delay) were provided to the investigators using the World Wide Web approximately twelve hours after data recording. Disturbances in the microgravity environment as recorded by these instruments are grouped by source type: Orbiter systems, on-board activities, payload operations, and unknown sources. The environment related to the Ku-band antenna dither, Orbiter structural modes, attitude deadband collapses, water dump operations, crew sleep, and crew exercise was comparable to the effects of these sources on previous Orbiter missions. Disturbances related to operations of the Isothermal Dendritic Growth Experiment and Space Acceleration Measurement Systems that were not observed on previous missions are detailed. The effects of Orbiter cabin and airlock depressurization and extravehicular activities are also reported for the first time. A set of data plots representing the entire mission is included in the CD-ROM version of this report.
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Four specific magnetic cleanliness problems from the last 30 years are discussed and their solutions are shown. These are the ESA GIOTTO Comet Halley despin motor compensation with its 1200 pole motors, the four CNES Mars Netlander solar petals optimization, 3-D field calculation and visualization using Visual Basic, the ESA ROSETTA huge solar petal 3-D field calculation, visualization and compensation and finally the NASA/ESA CASSINI-HUYGENS separation and its visualization with the help of Huygens magnetic cleanliness results.
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