&lt;title&gt;Total pressure sensor results from the early operations phase of the MSX mission&lt;/title&gt;

Boies, Mark T.; Phillips, Terry E.; Silver, David M.; El-Dinary, Ashruf S.; Uy, O. Manuel; Dyer, James S.; Mill, John D.

doi:10.1117/12.258304

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…The pressure increase produced by the venting was observed for approximately 6 h. We believe that the argon vent was stuck open because of frozen material, redundantvalve competition, or mechanical effects. 11 A result of this extended venting is cooling of the SPIRIT III cover by 6 ± C during the extended release period in response to gas expansion cooling and argon boiling-point depression. Once the venting stopped, the cover temperature stopped cooling and continued its upward trend.…”

Section: Spirit III Aperture Cover Ventingmentioning

confidence: 99%

Local Environment Surrounding the Midcourse Space Experiment Satellite During Its First Week

Green¹,

Galica²,

Mulhall³

et al. 1998

Journal of Spacecraft and Rockets

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The environment measured surrounding the complex Midcourse Space Experiment spacecraft during its rst week on orbit is reported. A suite of instruments including a pressure sensor, a neutral and an ion mass spectrometer, quartz crystal microbalances, and ashlamp-based water and particle detectors were activated within hours after launch. These instruments measured the gaseous composition, particulate, and lm accretion temporal histories. Spacecraft environment cleanliness and response to operational activities were used to guide decisions about sensor operation. As a result of careful material selection and ground preparation procedures, the measured levels of condensible species were suf ciently low to permit safe sensor operation after only a few days in orbit.

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Section: Spirit III Aperture Cover Ventingmentioning

confidence: 99%

Local Environment Surrounding the Midcourse Space Experiment Satellite During Its First Week

Green¹,

Galica²,

Mulhall³

et al. 1998

Journal of Spacecraft and Rockets

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“…These results have been published elsewhere. 9 The expected ionospheric and contaminant species were used to identify the types of ions to be measured in the IMS spectral calibration. 10 Ionospheric species at the MSX altitude of 900 km are predominantlyH C , He C , and O C based on the InternationalReference Ionosphere.…”

Section: Contamination Monitoring Instruments and Their Ground Calibrmentioning

confidence: 99%

Midcourse Space Experiment Contamination Measurement During Cryogen Phase

Uy¹,

Benson²,

Erlandson³

et al. 1998

Journal of Spacecraft and Rockets

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In-orbit measurements with contamination-monitoringinstruments were used to validate the Midcourse Space Experiment contaminationmodel and to investigate the phenomenon of molecular and particle generation in space. Measurements from the rst orbit contact through the rst 10 months showed water vapor as the largest gaseous species, with argon gas from a venting source important only during the rst week in orbit. Simple reporting tools were used for rapid assessments of the spacecraft environment during early operations. The contamination levels and the decay rate of water vapor around the spacecraft were found to be in excellent agreement with prelaunch predictions. Future measurements include validation of the model of the aging spacecraft and investigation of the degradation of thermal radiators.

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“…Among these phenomena are the measurements of the early operation pressure decay, the calculation of the linear and rotational velocity of a cryogenic telescope cover as it was jettisoned from the spacecraft, detection of electrons in the auroral regions, measurement of pressure spikes during quiescent periods, the environmental effects of an intense solar bake (SECOT) of the instrument section, the effects of instrument shadowing on localized pressure, and finally the long term decay of water trapped in the spacecraft thermal blankets during ground processing. [1][2][3][4][5][6][7] Whereas most of the previous papers concentrated on several of the witnessed phenomena, this paper will focus solely on the evolution of water from the thermal blankets and discuss the depth of the water reservoir. The thermal blankets were very carefully processed prior to launch and were baked out to remove as much water as possible.…”

Section: Introductionmentioning

confidence: 99%

The 8-year report on MSX thermal blanket outgassing: an inexhaustible reservoir

et al. 2004

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The Midcourse Space Experiment (MSX) spacecraft has now been in orbit for over 8 years. The Total Pressure Sensor (TPS) has continually made measurements of the ambient and spacecraft induced environment since launch on April 24, 1996. The environment surrounding the satellite continues to be very dynamic. The magnitude of the solar induced pressure peaks has not decayed with time as would be expected. Even sole consideration of measured pressure versus duration of solar illumination does not illustrate long term decay. The TPS has continued to measure pressure variations of more than 2 orders of magnitude as the sun illuminates the blankets surrounding the instrument. The multilayer thermal blankets appear to represent a large virtual source of water. The measured pressure is highly dependent upon the solar angle and the shadowing of surfaces by other structures. We will focus our attention on the results from an identical set of experiments conducted each year in July.

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<title>Total pressure sensor results from the early operations phase of the MSX mission</title>

Cited by 9 publications

References 3 publications

Local Environment Surrounding the Midcourse Space Experiment Satellite During Its First Week

Local Environment Surrounding the Midcourse Space Experiment Satellite During Its First Week

Midcourse Space Experiment Contamination Measurement During Cryogen Phase

The 8-year report on MSX thermal blanket outgassing: an inexhaustible reservoir

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