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HALOE
HALogen Occultation
Experiment
The Halogen Occultation Experiment (HALOE) was launched on the Upper
Atmosphere Research Satellite (UARS) spacecraft September 12, 1991,
and after a period of outgassing, it began science observations
October 11. The experiment uses solar occultation to measure vertical
profiles of O3, HCl, HF, CH4, H2O, NO, NO2, aerosol extinction,
and temperature versus pressure with an instantaneous vertical field
of view of 1.6 km at the Earth limb. Latitudinal coverage is from
80° S to 80° N over the course of 1 year and includes extensive
observations of the Antarctic region during spring. The altitude
range of the measurements extends from about 15 km to 60-130 km,
depending on channel.
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(UARS) The Upper Atmospheric Research
Satellite. GATS supported the design, development, testing, and
led the data processing effort for the Halogen Occultation Experiment
(HALOE).
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Internal data consistency checks, comparisons with correlative
measurements, and qualitative comparisons with 1992 Atmospheric
Trace Molecule Spectroscopy (ATMOS) results are in good
agreement. Examples of pressure versus latitude cross sections
and a global orthographic projection for the September 21
to October 15, 1992 period show the utility of CH4, HF,
and H2O as tracers, the occurrence of desiccation throughout
the southern hemisphere, the presence of the water vapor
hygropause in the tropics, evidence of Antarctic air in
the tropics, the influence of Hadley tropical upwelling,
and the first global distribution of HCl, HF, and NO throughout
the stratosphere. Nitric oxide measurements extend through
the lower thermosphere.
A review of the solar occultation techniques used in HALOE
and which will be used in the upcoming SOFIE mission were
presented at a June 2004 SOSST meeting. Click here to view
the presentation.
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