The ORA occultation radiometer on EURECA. Instrument description and preliminary results

Arijs, E.; Nevejans, D.; Fussen, D.; Frederick, P.; Ransbeeck, E. Van; Taylor, F. W.; Calcutt, S. B.; Werrett, S. T.; Hepplewhite, C. L.; Pritchard, T. M.; Burchell, I.; Rodgers, C. D.

doi:10.1016/0273-1177(95)00264-f

Cited by 10 publications

(2 citation statements)

References 9 publications

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“…The solar occultation experiment aimed at the atmospheric limb remote sounding of O 3 , NO 2 , H 2 O and aerosol extinction vertical profiles in the UV to near IR range by using independent radiometric modules (Arijs et al, 1995). ORA consisted of eight radiometers of similar design with broadband filters centred at 259, 340, 385, 435, 442, 943, 1013 nm, each containing a quartz window, an interference filter, and a simple optics followed by a photodiode detector.…”

Section: Application To Ora Datamentioning

confidence: 99%

Retrieval of vertical profiles of atmospheric refraction angles by inversion of optical dilution measurements

Fussen¹,

Tétard²,

Dekemper³

et al. 2015

Atmos. Meas. Tech.

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Abstract. In this paper, we consider occultations of celestial bodies through the atmospheric limb from low Earth orbit satellites and we show how the usual change of tangent altitude associated with atmospheric refraction is inseparably connected to a variation of the observed apparent intensity, for extended and pointlike sources. We demonstrate, in the regime of weak refraction angles, that atmospheric optical dilution and image deformation are strictly concomitant. The approach leads to the integration of a simple differential equation related to the observed transmittance in the absence of other absorbing molecules along the optical path. The algorithm does not rely on the absolute knowledge of the radiometer pointing angle that is related to the accurate knowledge of the satellite attitude. We successfully applied the proposed method to the measurements performed by two past occultation experiments: GOMOS for stellar and ORA for solar occultations. The developed algorithm (named ARID) will be applied to the imaging of solar occultations in a forthcoming pico-satellite mission.

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Section: Application To Ora Datamentioning

confidence: 99%

Retrieval of vertical profiles of atmospheric refraction angles by inversion of optical dilution measurements

Fussen¹,

Tétard²,

Dekemper³

et al. 2015

Atmos. Meas. Tech.

Self Cite

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“…In recent years, diverse remote sensing methods, e.g., The ORA instrument has been described elsewhere [Arijs et al, 1995]. Briefly, it consists of eight independent radiometers of similar design, each containing a quartz window, an interference filter, and a simple optics followed by a photodiode detector.…”

Section: Introductionmentioning

confidence: 99%

Tomography of the Earth's atmosphere by the spaceborne occultation radiometer ORA: Spatial inversion algorithm

Fussen¹,

Arijs²,

Leclere³

et al. 1997

J. Geophys. Res.

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Abstract. The occultation radiometer ORA was designed to perform measurements of Oa, NO2 , H20, number density, and aerosol extinction altitude profiles in the Earth's atmosphere through the occultation method viewing the full solar disk.The experiment was mounted on the EURECA satellite and measured the relative transmission of light during about 7000 orbital sunsets and sunrises from August 11, 1992, to May 13, 1993. The spatial inversion algorithm developed to retrieve the total extinction altitude profiles from these data is described here. It is shown that the signal measured by an instrument having a large field of view can be successfully processed to give a much better altitude resolution than the one related to the angular size of the Sun. The main difficulties concern the inclusion of all refractive effects, the application of a new inversion scheme and its associated mapping strategy to refine the aerosol layer detection. The algorithm applies to fully nonlinear occultation experiments requiring global and nonheuristic inversion schemes.

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Forty years of satellite meteorology at Oxford

Taylor

2011

Quart J Royal Meteoro Soc

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Forty years after a similar retrospective on ozone research at Oxford by Dobson in 1968, a review and synthesis is presented of the scientific and technological advances that were possible during the period from 1970 to 2010 as a result of the deployment of a number of innovative instruments on meteorological satellites by a research group in the Atmospheric Physics department at Oxford University.

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The ORA occultation radiometer on EURECA. Instrument description and preliminary results

Cited by 10 publications

References 9 publications

Retrieval of vertical profiles of atmospheric refraction angles by inversion of optical dilution measurements

Retrieval of vertical profiles of atmospheric refraction angles by inversion of optical dilution measurements

Tomography of the Earth's atmosphere by the spaceborne occultation radiometer ORA: Spatial inversion algorithm

Forty years of satellite meteorology at Oxford

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