BackForwardInstrument:  HALOE 

Instrument details
Acronym HALOE
Full name Halogen Occultation Experiment
Purpose Chemistry in the upper atmosphere. Observed species: CH4, H2O, HCl, HF, NO, NO2 and O3
Short description

Pressure-modulated correlation spectrometer with eight channels in the range 2.43-10.25 µm. Spectral resolution about 3 nm for SWIR, 5 cm-1 for MWIR and TIR
Background

New concept
Scanning Technique

Limb sounding by sun occultation. About 28 occultation/day referring to 14 different longitudes
Resolution Vertical: 1.6 km. Horizontal: about 300 km along-view
Coverage / Cycle 28 occultation/day referring to 14 different longitudes. High latitudes
Mass 101 kg Power Data Rate 4 kbps

 

Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1991 to 2005
Last update: 2026-06-01
Detailed characteristics
Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Instrument classification
  • Earth observation instrument
  • Limb sounders
  • Limb sounder
WIGOS Subcomponents
  • Subcomponent 2
  • UV/VIS/NIR/IR/MW limb sounders
  • UV/VIS/NIR/IR occultation limb sounder
Mission objectives
Primary mission objectives
  • CH4 mole fraction
  • H2O
  • HCl
  • NO
  • NO2
  • NO3 Mole Fraction
  • O3 mole fraction
Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
Note: * Primary mission objective.