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Auroral spectral estimation with wide-band color mosaic CCDs

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Auroral spectral estimation with wide-band color mosaic CCDs. / Jackel, B.; Unick, C.; Syrjasuo, M.; Partamies, N.; Wild, Jim; Woodfield, Emma; McWhirter, Ian; Kendall, E.; Spanswick, Emma.

In: Geoscientific Instrumentation, Methods and Data Systems, Vol. 3, 11.06.2014, p. 71-94.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Jackel, B, Unick, C, Syrjasuo, M, Partamies, N, Wild, J, Woodfield, E, McWhirter, I, Kendall, E & Spanswick, E 2014, 'Auroral spectral estimation with wide-band color mosaic CCDs', Geoscientific Instrumentation, Methods and Data Systems, vol. 3, pp. 71-94. https://doi.org/10.5194/gid-3-753-2013

APA

Jackel, B., Unick, C., Syrjasuo, M., Partamies, N., Wild, J., Woodfield, E., McWhirter, I., Kendall, E., & Spanswick, E. (2014). Auroral spectral estimation with wide-band color mosaic CCDs. Geoscientific Instrumentation, Methods and Data Systems, 3, 71-94. https://doi.org/10.5194/gid-3-753-2013

Vancouver

Jackel B, Unick C, Syrjasuo M, Partamies N, Wild J, Woodfield E et al. Auroral spectral estimation with wide-band color mosaic CCDs. Geoscientific Instrumentation, Methods and Data Systems. 2014 Jun 11;3:71-94. https://doi.org/10.5194/gid-3-753-2013

Author

Jackel, B. ; Unick, C. ; Syrjasuo, M. ; Partamies, N. ; Wild, Jim ; Woodfield, Emma ; McWhirter, Ian ; Kendall, E. ; Spanswick, Emma. / Auroral spectral estimation with wide-band color mosaic CCDs. In: Geoscientific Instrumentation, Methods and Data Systems. 2014 ; Vol. 3. pp. 71-94.

Bibtex

@article{3d236e0ac3224b6fbe6880b2fda5377d,
title = "Auroral spectral estimation with wide-band color mosaic CCDs",
abstract = "Optical aurora can be structured over a wide range of spatial and temporal scales with spectral features that depend on the energy of precipitating particles. Scientific studies typically combine data from multiple instruments that are individually optimized for spatial, spectral, or temporal resolution. One recent addition combines all-sky optics with color mosaic CCD (charge-coupled device) detectors that use a matrix of different wide-band micro-filters to produce an image with several (often three) color channels. These devices provide sequences of two dimensional multispectral luminosity with simultaneous exposure of all color channels allowing interchannel comparison even during periods with rapidly varying aurora. At present color auroral image data are primarily used for qualitative analysis. In this study a quantitative approach based on Backus–Gilbert linear inversion was used to better understand the effective spectral resolution of existing and proposed instruments. Two spectrally calibrated commercial detectors (Sony ICX285AQ and ICX429AKL) with very different color mosaics (RGB (red, green, blue) vs. CYGM (cyan, yellow, green, magenta)) were found to have very similar spectral resolution: three channels with FWHM (full-width half-maximum) ≈100 nm; a NIR (near infrared) blocking filter is important for stabilizing inversion of both three-channel configurations. Operating the ICX429AKL in a noninterlaced mode would improve spectral resolution and provide an additional near infrared channel. Transformations from arbitrary device channels to RGB are easily obtained through inversion. Simultaneous imaging of multiple auroral emissions may be achieved using a single-color camera with a triple-pass filter. Combinations of multiple cameras with simple filters should provide ~50 nm resolution across most of the visible spectrum. Performance of other instrument designs could be explored and compared using the same quantitative framework.",
keywords = "Optical systems, Retrieval techniques",
author = "B. Jackel and C. Unick and M. Syrjasuo and N. Partamies and Jim Wild and Emma Woodfield and Ian McWhirter and E. Kendall and Emma Spanswick",
note = "{\textcopyright} Author(s) 2014. CC Attribution 3.0 License.",
year = "2014",
month = jun,
day = "11",
doi = "10.5194/gid-3-753-2013",
language = "English",
volume = "3",
pages = "71--94",
journal = "Geoscientific Instrumentation, Methods and Data Systems",
issn = "2193-0856",
publisher = "Copernicus Gesellschaft mbH",

}

RIS

TY - JOUR

T1 - Auroral spectral estimation with wide-band color mosaic CCDs

AU - Jackel, B.

AU - Unick, C.

AU - Syrjasuo, M.

AU - Partamies, N.

AU - Wild, Jim

AU - Woodfield, Emma

AU - McWhirter, Ian

AU - Kendall, E.

AU - Spanswick, Emma

N1 - © Author(s) 2014. CC Attribution 3.0 License.

PY - 2014/6/11

Y1 - 2014/6/11

N2 - Optical aurora can be structured over a wide range of spatial and temporal scales with spectral features that depend on the energy of precipitating particles. Scientific studies typically combine data from multiple instruments that are individually optimized for spatial, spectral, or temporal resolution. One recent addition combines all-sky optics with color mosaic CCD (charge-coupled device) detectors that use a matrix of different wide-band micro-filters to produce an image with several (often three) color channels. These devices provide sequences of two dimensional multispectral luminosity with simultaneous exposure of all color channels allowing interchannel comparison even during periods with rapidly varying aurora. At present color auroral image data are primarily used for qualitative analysis. In this study a quantitative approach based on Backus–Gilbert linear inversion was used to better understand the effective spectral resolution of existing and proposed instruments. Two spectrally calibrated commercial detectors (Sony ICX285AQ and ICX429AKL) with very different color mosaics (RGB (red, green, blue) vs. CYGM (cyan, yellow, green, magenta)) were found to have very similar spectral resolution: three channels with FWHM (full-width half-maximum) ≈100 nm; a NIR (near infrared) blocking filter is important for stabilizing inversion of both three-channel configurations. Operating the ICX429AKL in a noninterlaced mode would improve spectral resolution and provide an additional near infrared channel. Transformations from arbitrary device channels to RGB are easily obtained through inversion. Simultaneous imaging of multiple auroral emissions may be achieved using a single-color camera with a triple-pass filter. Combinations of multiple cameras with simple filters should provide ~50 nm resolution across most of the visible spectrum. Performance of other instrument designs could be explored and compared using the same quantitative framework.

AB - Optical aurora can be structured over a wide range of spatial and temporal scales with spectral features that depend on the energy of precipitating particles. Scientific studies typically combine data from multiple instruments that are individually optimized for spatial, spectral, or temporal resolution. One recent addition combines all-sky optics with color mosaic CCD (charge-coupled device) detectors that use a matrix of different wide-band micro-filters to produce an image with several (often three) color channels. These devices provide sequences of two dimensional multispectral luminosity with simultaneous exposure of all color channels allowing interchannel comparison even during periods with rapidly varying aurora. At present color auroral image data are primarily used for qualitative analysis. In this study a quantitative approach based on Backus–Gilbert linear inversion was used to better understand the effective spectral resolution of existing and proposed instruments. Two spectrally calibrated commercial detectors (Sony ICX285AQ and ICX429AKL) with very different color mosaics (RGB (red, green, blue) vs. CYGM (cyan, yellow, green, magenta)) were found to have very similar spectral resolution: three channels with FWHM (full-width half-maximum) ≈100 nm; a NIR (near infrared) blocking filter is important for stabilizing inversion of both three-channel configurations. Operating the ICX429AKL in a noninterlaced mode would improve spectral resolution and provide an additional near infrared channel. Transformations from arbitrary device channels to RGB are easily obtained through inversion. Simultaneous imaging of multiple auroral emissions may be achieved using a single-color camera with a triple-pass filter. Combinations of multiple cameras with simple filters should provide ~50 nm resolution across most of the visible spectrum. Performance of other instrument designs could be explored and compared using the same quantitative framework.

KW - Optical systems

KW - Retrieval techniques

U2 - 10.5194/gid-3-753-2013

DO - 10.5194/gid-3-753-2013

M3 - Journal article

VL - 3

SP - 71

EP - 94

JO - Geoscientific Instrumentation, Methods and Data Systems

JF - Geoscientific Instrumentation, Methods and Data Systems

SN - 2193-0856

ER -