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CEPEX: NASA ER-2 Lyman Alpha Hygrometer Data


This dataset contains water vapor measurements from the Harvard University Lyman Alpha instrument aboard the ER-2 for 9 missions during CEPEX. The instrument used the techniques of photofragment fluorescence combined with dual path absorption to measure water vapor concentrations ranging from 1013 to 1016 molecules/cubic centimeters at pressures from 50 to 500 mb. The detection scheme utilized the Lyman-Alpha photons (121.6 nanometers) to photo- dissociate water vapor and produce excited OH molecules which emit photons that are detected by a photomultiplier near 314 nanometers. Units are in ppmv. Principal Investigators were Weinstock, Dessler, Hintsa, and Anderson (Harvard University).

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Additional information

Data Quality final
  • 1.0 (2006-07-26)
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Related projects
Spatial Type point
Frequency 1 second
Language English
GCMD Science Keywords Expand keywords
Related links

Temporal coverage

Begin datetime 1993-03-17 00:00:00
End datetime 1993-04-05 23:59:59

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 20.00, Minimum (South) Latitude: -20.00
Minimum (West) Longitude: -140.00, Maximum (East) Longitude: 140.00

Primary point of contact information

EOL Data Support <>

Additional contact information


Weinstock, E., et al. 2006. CEPEX: NASA ER-2 Lyman Alpha Hygrometer Data. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 12 Apr 2024.

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