DQRID : D030415.1
Start DateStart TimeEnd DateEnd Time
03/27/2003210204/10/20032214
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Subject:
NSA/AERI/C1 - Failure of AERI cryogenic cooler
DataStreams:nsaaeriC1.00, nsaaerisummaryC1.a1, nsaaeriengineerC1.a1
Description:
The cryogenic cooler current reached its maximum value, which indicates a potential 
failure of the cooler unit. The effect of the cooler failure is an increase in detector 
temperature. Detector temperature is normally 69K. At temperatures in excess of 72K, the long 
wave responsivity decreases due to detector noise. During the period of March 27, 2003 @ 
21:02 GMT through April 10, 2003 @ 23:42 GMT, the cooler current was at its maximum and 
detector temperatures varied from 72-75K. The increase in detector noise may affect some 
calculations.
Suggestions: 
null
Measurements:nsaaeriengineerC1.a1:
  • Imaginary radiance during sky view averaged over (985_990 cm-1)(skyViewImaginaryRadiance985_990)
  • Radiance standard deviation during sky view averaged over (985_990 cm^-1)(skyViewStdDevRadiance985_990)
  • Longwave elevated air brightness temperature from radiance average (700_705
    cm-1)(elevatedLayerAirTemp700_705)
  • Longwave radiance average (700_705 cm^-1) elevated air(elevatedLayerRadiance700_705)
  • Stirling cycle cooler current(coolerCurrent)
  • Longwave surface air brightness temperature from radiance average (675_680 cm-1)(surfaceLayerAirTemp675_680)
  • The noise equivalent radiance observed in the longwave channel during a sky view
    at 1000 cm-1(LWskyNEN)
  • Detector Temperature(detectorTemp)
  • Longwave radiance average (675-680 cm-1) Surface Air(surfaceLayerRadiance675_680)
  • Radiance standard deviation during sky view averaged over (675_680 cm-1)(skyViewStdDevRadiance675_680)
  • Sky View Imaginary Radiance (675_680 cm^-1)(skyViewImaginaryRadiance675_680)
  • Sky View Imaginary Radiance (700_705 cm^-1)(skyViewImaginaryRadiance700_705)
  • Longwave HBB noise-equivalent radiance(LW_HBB_NEN)
  • Radiance standard deviation during sky view averaged over (700_705 cm-1)(skyViewStdDevRadiance700_705)
  • Logical flag indicating whether longwave channel noise equivalent radiance is
    acceptable in sky view (true/false). Determined using LWskyNEN and
    LWskyNENlimit.(LWskyNENacceptable)
  • Characteristic value representing overall longwave channel responsivity(LWresponsivity)
  • Longwave scene NEN limit(LWskyNENlimit)
more
nsaaerisummaryC1.a1:
  • Longwave window radiance average (985_990 cm^-1)(longwaveWindowRadiance985_990)
  • Longwave HBB noise-equivalent radiance(LW_HBB_NEN)
  • Longwave surface air brightness temperature from radiance average (675_680 cm-1)(surfaceLayerAirTemp675_680)
  • Longwave radiance average (675-680 cm-1) Surface Air(surfaceLayerRadiance675_680)
  • Longwave window brightness temperature from radiance average (985_990 cm^-1)(longwaveWindowAirTemp985_990)
  • Radiance standard deviation during sky view averaged over (675_680 cm-1)(skyViewStdDevRadiance675_680)
  • Radiance standard deviation during sky view averaged over (700_705 cm-1)(skyViewStdDevRadiance700_705)
  • AERI LW scene NESR spectral averages (ch1)(SkyNENCh1)
  • AERI LW Scene Variability Spectral Averages (Ch1)(SkyVariabilityCh1)
  • AERI LW Responsivity Spectral Averages (Ch1)(ResponsivitySpectraAveragesCh1)
  • Characteristic value representing overall longwave channel responsivity(LWresponsivity)
  • Longwave radiance average (700_705 cm^-1) elevated air(elevatedLayerRadiance700_705)
  • AERI LW Scene Radiance Spectral Averages (Ch1)(SkyRadianceSpectralAveragesCh1)
  • AERI LW Scene radiance spectral averages (ch1)(SkyRadianceSpectraAveragesCh1)
  • Logical flag indicating whether longwave channel noise equivalent radiance is
    acceptable in sky view (true/false). Determined using LWskyNEN and
    LWskyNENlimit.(LWskyNENacceptable)
  • AERI LW responsivity spectral averages (ch1)(ResponsivitySpectralAveragesCh1)
  • Radiance standard deviation during sky view averaged over (985_990 cm^-1)(skyViewStdDevRadiance985_990)
  • AERI LW Scene Variability Spectral Averages (Ch1)(SkyVariabilityAveragesCh1)
  • Longwave elevated air brightness temperature from radiance average (700_705
    cm-1)(elevatedLayerAirTemp700_705)
  • AERI LW Scene NESR Spectral Averages (Ch1)(SkyNENch1)
  • AERI LW scene brightness temp spectral averages (ch1)(SkyBrightnessTempSpectralAveragesCh1)
  • The noise equivalent radiance observed in the longwave channel during a sky view
    at 1000 cm-1(LWskyNEN)
  • AERI LW Scene Variability Spectral Averages (Ch1)(SkyUniformityCh1)
more
nsaaeriC1.00:
  • (Raw data stream - documentation not supported)
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