&lt;title&gt;Flashlamp measurement of the MSX particulate environment&lt;/title&gt;

Galica, Gary E.; Green, B. David; Atkinson, John J.; Aurilio, G.; Shepherd, O.; Lesho, Jeffrey C.; Uy, O. Manuel

doi:10.1117/12.258307

Cited by 5 publications

(5 citation statements)

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“…19 Particle measurements by the xenon ashlamp started from day 2 and have continued to the present. Particles were observed during discrete events such as door releases, 14,21 as well as during quiescent times when the spacecraft was not maneuvering. Figure 17 shows the fraction of frames of the UVISI IVW in which particles were observed during quiet times in orbit.…”

Section: Results During Cryogen Phasementioning

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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Section: Results During Cryogen Phasementioning

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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“…Mapping of the trajectories backward indicates that the particles originated on the CX face of the spacecraft at a time just after solar illumination. 16 A particle also was observed moving toward the spacecraft with a 30-cm/s velocity vector. This particle also could have originatedon MSX re-enteringthe eld of view after being released on an initial trajectory downward in the direction of satellite motion, "ram."…”

Section: Particlesmentioning

confidence: 93%

“…Particles are illuminated with 400-to 900-nm light in a series of nine 11-ms pulses sequenced to permit velocity determination within a single image. 6,16 During the rst week in orbit, the particulates observed are likely residual from ground operations as brought to orbit with the spacecraft.…”

Section: Particlesmentioning

confidence: 98%

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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“…The MSX early mission environment has been reported in several articles. 2,3,[13][14][15][16][17][18] Additionally, the level to which the spacecraft induced environment decays over the long-term is very important in attempting to predict the contamination limiting lifetime issues associated with each sensor. Finally, specific spacecraft operations that can be shown to create significant contaminants can possibly be avoided in order to prolong mission life.…”

Section: Satellite Configurationmentioning

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>Flashlamp measurement of the MSX particulate environment</title>

Cited by 5 publications

References 0 publications

Midcourse Space Experiment Contamination Measurement During Cryogen Phase

Midcourse Space Experiment Contamination Measurement During Cryogen Phase

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

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

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