Atmospheric Ultraviolet Radiance Integrated Code (AURIC): theory, software architecture, inputs, and selected results

Strickland, D. J.; Bishop, James; Evans, J. S.; Majeed, T.; Shen, P. Mike; Cox, R. J.; Link, R.; Huffman, R. E.

doi:10.1016/s0022-4073(98)00098-3

Cited by 190 publications

(188 citation statements)

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“…The limb retrieval is, in principle, independent of the retrieved compositional information. Furthermore, the disk and limb retrievals are themselves independent because qualitatively different algorithms are used to extract the 0-45 nm solar energy (albeit both GUVI algorithms are based on the AURIC code [Strickland et al, 1999]). …”

Section: Comparisons With the Terrestrial Dayglowmentioning

confidence: 99%

“…GUVI stellar measurements throughout the TIMED mission suggest that the GUVI calibration has remained stable throughout the mission. The Q EUV dsk requires a lookup table constructed from multiple simulations of the FUV column emission rates made with the AURIC model using a constant input solar spectrum [Strickland et al, 1999]. The lookup table relates columnar emission with solar zenith angle and scaling factors for the atmospheric constituent densities and absorption cross sections.…”

Section: Comparisons With the Terrestrial Dayglowmentioning

confidence: 99%

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Solar extreme ultraviolet irradiance: Present, past, and future

et al. 2011

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[1] New models of solar extreme ultraviolet (EUV) irradiance variability are constructed in 1 nm bins from 0 to 120 nm using multiple regression of the Mg II and F 10.7 solar activity indices with irradiance observations made during the descending phase of cycle 23. The models have been used to reconstruct EUV spectra daily since 1950, annually since 1610, to forecast daily EUV irradiance and to estimate future levels in cycle 24. A two-component model developed by scaling the observed rotational modulation of the two solar indices underestimates the solar cycle changes that the Solar EUV Experiment (SEE) reports at wavelengths shorter than 40 nm and longer than 80 nm. A three-component model implemented by including an additional term derived from the smoothed Mg II index better reproduces the measurements at all wavelengths. The three-component model is consistent with variations in the EUV energy from 0 to 45 nm that produces the far ultraviolet (FUV) terrestrial dayglow observed by the Global Ultraviolet Imager (GUVI). However, the spectral structure of this third component is complex, and its origin is uncertain. Analogous two-and three-component models are also developed with absolute scales determined by the NRLEUV2 spectrum of the quiet Sun rather than by the SEE average spectrum. Assessment of the EUV absolute spectrum and variability of the four different models indicate that during solar cycle 23, the EUV irradiance (0 to 120 nm) increased 100 ± 30%, from 2.9 ± 0.2 to 5.8 ± 0.9 mWm −2 , and may have been as low as 1.9 ± 0.5 mWm −2 during the 17th-century Maunder Minimum. Near the peak of upcoming solar cycle 24, EUV irradiance is expected to increase 40% to 80% above the 2008 minimum values.

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Section: Comparisons With the Terrestrial Dayglowmentioning

confidence: 99%

Section: Comparisons With the Terrestrial Dayglowmentioning

confidence: 99%

Solar extreme ultraviolet irradiance: Present, past, and future

et al. 2011

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“…The algorithm, a uniqueness study, and two initial applications are being reported. The algorithm extends the works of Meier et al [1995] and Strickland et al [1995], who used the Atmospheric Ultraviolet Radiance Integrated Code (AURIC)model [Strickland et al, 1998] to calculate the needed excitation rates and the REDISTER model of Gladstone [1982,1988] The choice of reference level must be dictated by the uniqueness of the derived parameter to the observations, which in turn is dictated by the physics related to the observing conditions. The physics argues for a reference level in terms of N 2 since, as noted above, variations in the observed signal reflect competition between O and N 2 for photoelectron energy.…”

Section: Introductionmentioning

confidence: 99%

Global O/N₂ derived from DE 1 FUV dayglow data: Technique and examples from two storm periods

Strickland¹,

Cox²,

Meier³

et al. 1999

J. Geophys. Res.

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It is now well established that high-latitude forcing (heating and convection) can lead to significant thermospheric disturbances on a global scale. The basic scenario is upwelling of air from the lower thermosphere within the auroral oval due to Joule/particle heating followed by horizontal advection of this molecular rich air through a combination of diurnal tidal motion and ion convection effects. During storms, a strong increase in ion convection can produce a wind surge (due to ion/neutral coupling) out of the polar cap directed toward the midnight/postmidnight midlatitude region. The increased convection currents are caused by enhanced ionization within the oval and increased ion drift associated with intensification of the polar cap electric field. The resulting wind pattern mimicks the two-cell ion convection pattern, provided storm conditions last for several hours. An extensive bibliography exists on the response of the global thermosphere to geomagnetic disturbances. Examples of recent papers on the subject are those by Burns et al. [1991, 1995], and Fuller-Rowe# et al. [1994, 1996], who base their findings on general circulation model results. Numerous references to past work may be found in these papers. 4251

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“…1. This was produced by simulating the effects of a monoenergetic 1 keV electron beam incident on a realistic atmospheric model (Strickland et al, 1999). The results are highly dependent on incident energy, with higher energies penetrating to lower altitudes and exciting different atmospheric constituents than at higher altitudes.…”

Section: Introductionmentioning

confidence: 99%

Auroral spectral estimation with wide-band color mosaic CCDs

Jackel

Unick

Syrjäsuo

et al. 2014

Geosci. Instrum. Method. Data Syst.

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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 halfmaximum) ≈ 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 triplepass 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.

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Atmospheric Ultraviolet Radiance Integrated Code (AURIC): theory, software architecture, inputs, and selected results

Cited by 190 publications

References 0 publications

Solar extreme ultraviolet irradiance: Present, past, and future

Solar extreme ultraviolet irradiance: Present, past, and future

Global O/N₂ derived from DE 1 FUV dayglow data: Technique and examples from two storm periods

Auroral spectral estimation with wide-band color mosaic CCDs

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Atmospheric Ultraviolet Radiance Integrated Code (AURIC): theory, software architecture, inputs, and selected results

Cited by 190 publications

References 0 publications

Solar extreme ultraviolet irradiance: Present, past, and future

Solar extreme ultraviolet irradiance: Present, past, and future

Global O/N2 derived from DE 1 FUV dayglow data: Technique and examples from two storm periods

Auroral spectral estimation with wide-band color mosaic CCDs

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Product

Resources

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Global O/N₂ derived from DE 1 FUV dayglow data: Technique and examples from two storm periods