Abstract
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. Experiment operations have been essentially flawless, and all performance criteria either meet or exceed specifications. Internal data consistency checks, comparisons with correlative measurements, and qualitative comparisons with 1985 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 dehydration in the Antarctic lower stratosphere, 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.
Highlights
CH4, HF, andH20 astracers,the occurrenceof dehydration hassuchprofoundeffectson humanhealth,cropgrowth,and in the Antarcticlower stratospheret,hepresenceof the water the climate,it is vital that a thoroughunderstandingof those vaporhygropausein the tropics,evidenceof Antarctic air in factors affecting its distribution be developed so that thetropicst,heinfluenceof Hadleytropicalupwelling,andthe appropriatecorrectiveactionsor otherplanningstepscan be first global distributionof HC1, HF, and NO throughoutthe taken
The Halogen Occultation Experiment (HALOE) instrumentincludesboth broadbandand gas filter channels coveringselectedportionsof thespectrarlangefrom2.45 gm to 10.04 gm
Complete rigor in forwardcalculationsusingthe sourcefunctionNS. Instead of this approach,the effect is atmospheripcressureandtemperaturer,espectively.When the handled in data processingby retrieving a parameterized single-dimension(aellevationdirection)limb-darkeningcurve whichmatchesthetwodimensionallyaveragedHALOE signal obtainedfrom spatialscansof the solar disk
Summary
A schematic of the broadband HALOE measurement approachis shownin Figure. ThemeasuredvoltageV for a broadspectrabl andof widthAv, wherev is wavenumberc, an be expressedby altitude are being used for pressure registration and temperatureversuspressureretrieval. The real HALOE instrumentsignalis alsoweightedby spatialaveragingdueto the instantaneousvertical field-of-view (IFOV) functionof the instrument. When this factor is included, the measured voltageV is givenby. Instead of this approach,the effect is atmospheripcressureandtemperaturer,espectively.When the handled in data processingby retrieving a parameterized single-dimension(aellevationdirection)limb-darkeningcurve.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
