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  • 1
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    Online Resource
    The OSIRIS instrument on the Odin spacecraft
    Canadian Science Publishing ; 2004
    In:  Canadian Journal of Physics Vol. 82, No. 6 ( 2004-06-01), p. 411-422
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 82, No. 6 ( 2004-06-01), p. 411-422
    Abstract: The optical spectrograph and infrared imager system (OSIRIS) on board the Odin spacecraft is designed to retrieve altitude profiles of terrestrial atmospheric minor species by observing limb-radiance profiles. The grating optical spectrograph (OS) obtains spectra of scattered sunlight over the range 280800 nm with a spectral resolution of approximately 1 nm. The Odin spacecraft performs a repetitive vertical limb scan to sweep the OS 1 km vertical field of view over selected altitude ranges from approximately 10 to 100 km. The terrestrial absorption features that are superimposed on the scattered solar spectrum are monitored to derive the minor species altitude profiles. The spectrograph also detects the airglow, which can be used to study the mesosphere and lower thermosphere. The other part of OSIRIS is a three-channel infrared imager (IRI) that uses linear array detectors to image the vertical limb radiance over an altitude range of approximately 100 km. The IRI observes both scattered sunlight and the airglow emissions from the oxygen infrared atmospheric band at 1.27 µm and the OH (3-1) Meinel band at 1.53 µm. A tomographic inversion technique is used with a series of these vertical images to derive the two-dimensional distribution of the emissions within the orbit plane. PACS Nos.: 07.05.Pj, 07.60.Dq, 07.60.Rd, 07.87, 94.10.Dy, 94.10.Fa, 94.10.Gb, 94.10.Rk
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p04-005
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 2021497-2
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  • 2
    Online Resource
    Online Resource
    Mid-latitude 〈i〉E〈/i〉-region bulk motions inferred from digital ionosonde and HF radar measurements
    Copernicus GmbH ; 2004
    In:  Annales Geophysicae Vol. 22, No. 11 ( 2004-11-29), p. 3789-3798
    Details
    In: Annales Geophysicae, Copernicus GmbH, Vol. 22, No. 11 ( 2004-11-29), p. 3789-3798
    Abstract: Abstract. In the mid-latitude E-region there is now evidence suggesting that neutral winds play a significant role in driving the local plasma instabilities and electrodynamics inside sporadicE layers. Neutral winds can be inferred from coherent radar backscatter measurements of the range-/azimuth-time-intensity (RTI/ATI) striations of quasi-periodic (QP) echoes, or from radar interferometer/imaging observations. In addition, neutral winds in the E-region can be estimated from angle-of-arrival ionosonde measurements of sporadic-E layers. In the present paper we analyse concurrent ionosonde and HF coherent backscatter observations obtained when a Canadian Advanced Digital Ionosonde (CADI) was operated under a portion of the field-of-view of the Valensole high frequency (HF) radar. The Valensole radar, a mid-latitude radar located in the south of France with a large azimuthal scanning capability of 82° (24° E to 58° W), was used to deduce zonal bulk motions of QP echoing regions using ATI analysis. The CADI was used to measure angle-of-arrival information in two orthogonal horizontal directions and thus derive the motion of sporadic-E patches drifting with the neutral wind. This paper compares the neutral wind drifts of the unstable sporadic-E patches as determined by the two instruments. The CADI measurements show a predominantly westward aligned motion, but the measured zonal drifts are underestimated relative to those observed with the Valensole radar.
    Type of Medium: Online Resource
    ISSN: 1432-0576
    URL: Article
    DOI: 10.5194/angeo-22-3789-2004
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2004
    detail.hit.zdb_id: 1458425-6
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  • 3
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    Online Resource
    Retrieval of subvisual cirrus cloud optical thickness from limb-scatter measurements
    Copernicus GmbH ; 2013
    In:  Atmospheric Measurement Techniques Vol. 6, No. 1 ( 2013-01-22), p. 105-119
    Details
    In: Atmospheric Measurement Techniques, Copernicus GmbH, Vol. 6, No. 1 ( 2013-01-22), p. 105-119
    Abstract: Abstract. We present a technique for estimating the optical thickness of subvisual cirrus clouds detected by OSIRIS (Optical Spectrograph and Infrared Imaging System), a limb-viewing satellite instrument that measures scattered radiances from the UV to the near-IR. The measurement set is composed of a ratio of limb radiance profiles at two wavelengths that indicates the presence of cloud-scattering regions. Cross-sections and phase functions from an in situ database are used to simulate scattering by cloud-particles. With appropriate configurations discussed in this paper, the SASKTRAN successive-orders of scatter radiative transfer model is able to simulate accurately the in-cloud radiances from OSIRIS. Configured in this way, the model is used with a multiplicative algebraic reconstruction technique (MART) to retrieve the cloud extinction profile for an assumed effective cloud particle size. The sensitivity of these retrievals to key auxiliary model parameters is shown, and it is shown that the retrieved extinction profile, for an assumed effective cloud particle size, models well the measured in-cloud radiances from OSIRIS. The greatest sensitivity of the retrieved optical thickness is to the effective cloud particle size. Since OSIRIS has an 11-yr record of subvisual cirrus cloud detections, the work described in this manuscript provides a very useful method for providing a long-term global record of the properties of these clouds.
    Type of Medium: Online Resource
    ISSN: 1867-8548
    URL: Article
    DOI: 10.5194/amt-6-105-2013
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2013
    detail.hit.zdb_id: 2505596-3
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  • 4
    Online Resource
    Online Resource
    Cloud discrimination in probability density functions of limb-scattered sunlight measurements
    Copernicus GmbH ; 2013
    In:  Atmospheric Measurement Techniques Vol. 6, No. 12 ( 2013-12-09), p. 3359-3368
    Details
    In: Atmospheric Measurement Techniques, Copernicus GmbH, Vol. 6, No. 12 ( 2013-12-09), p. 3359-3368
    Abstract: Abstract. A technique characterizing the distribution of cirrus cloud-top occurrences from the Optical Spectrograph and Infrared Imaging System (OSIRIS) limb-scattering radiance profiles is presented. The technique involves computing scattering residual profiles by comparing normalized measured radiance and modelled molecular radiance profiles where enhancements in the measured radiance indicate the presence of clouds. Probability density functions of scattering residuals show the distribution is not a continuum measurement; there is a distinction between the cloudy and cloud-free conditions. Observations show high cloud-top occurrences in the upper troposphere and lower stratosphere region above Indonesia and Central America. Results obtained using this technique with OSIRIS measurements are compared to those obtained by Sassen et al. (2008) with Cloud-Aerosol Lidar Pathfinder Satellite Observations (CALIPSO) nadir measurements and to those obtained by Wang et al. (1996) with Stratospheric Aerosol and Gas Experiment (SAGE) II solar occultation measurements.
    Type of Medium: Online Resource
    ISSN: 1867-8548
    URL: Article
    DOI: 10.5194/amt-6-3359-2013
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2013
    detail.hit.zdb_id: 2505596-3
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  • 5
    Online Resource
    Online Resource
    Observations of an extended mesospheric tertiary ozone peak
    Elsevier BV ; 2005
    In:  Journal of Atmospheric and Solar-Terrestrial Physics Vol. 67, No. 15 ( 2005-10), p. 1395-1402
    Details
    In: Journal of Atmospheric and Solar-Terrestrial Physics, Elsevier BV, Vol. 67, No. 15 ( 2005-10), p. 1395-1402
    Type of Medium: Online Resource
    ISSN: 1364-6826
    URL: Article
    DOI: 10.1016/j.jastp.2005.06.019
    RVK:
    UA 4547.8
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2005
    detail.hit.zdb_id: 2020910-1
    SSG: 16,13
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