Atmospheric Ultraviolet Radiance Integrated Code (AURIC)

ars_thumbThe Atmospheric Ultraviolet Radiance Integrated Code (AURIC) is a software package developed by Computational Physics, Inc. (CPI) for the Air Force Phillips Laboratory (currently the Air Force Research Laboratory [AFRL]) for upper atmospheric radiance modeling from the far ultraviolet to the near infrared. It effectively extends the MODTRAN® code for calculating atmospheric transmittance and radiance (infrared and Rayleigh plus aerosol scattering of sunlight) to altitudes above 100 km and wavelengths down to 80 nm.

Many enhancements have been made to AURIC since its inception, including a more comprehensive chemistry model (for neutral and ionospheric species), new radiative transfer capabilities, the option of performing photoelectron energy degradation with or without transport, updates to electron impact cross sections (Majeed and Strickland, 1997; Strickland et al., 1997), and the addition of new emission features. AURIC is currently in use by a number of organizations: AFRL, NRL, and JHU/APL. A summary of AURIC's modeling capabilities can be found in the AURIC brochure. Examples of applications papers using AURIC are listed in the references below.

AURIC has been validated against numerous published rocket and satellite data, and shown to have good overall agreement with the measurements. The airglow modeling capabilities of AURIC make it a powerful tool for characterizing optical backgrounds at thermospheric altitudes, for developing remote sensing algorithms, for simulating data from rocket and satellite optical instrumentation, as well as conducting science investigations (sensitivity studies and data analyses).

AURIC consists of portable FORTRAN source code for calculating airglow spectral radiances and densities of chemically active species. A text-based user interface is provided for tailoring the execution of the dayglow and nightglow codes for specific applications. In line with its operational status, the software compiles and executes under several common operating systems: Linux, Mac OS, and Windows. An AURIC Users Manual has also been written with detailed information on the operation of the model on Linux, Mac OS, and Windows systems along with numerous tables and illustrations of inputs and outputs.

The AURIC FORTRAN code is fully portable to any system with a FORTRAN 77 compiler (with common extensions). If you wish to learn more about AURIC before downloading the code itself, you may obtain the AURIC Users Manual separately.

Limb profiles in Rayleighs for 60° solar zenith angle and a Hinteregger solar EUV spectrum based on F10.7 = 150, plus profiles for the optically thick OI 1304 Å and HI 1216 Å features. The difference in shape between the two LBH profiles is due to differences in O2 Schumann-Runge opacity.

References

Majeed, T.; and Strickland, D. J. (1997), New Survey of Electron Impact Cross Sections for Photoelectron and Auroral Electron Energy Loss Calculations, J. Phys. Chem. Ref. Data, 26(2), 335, doi:10.1063/1.556008.

Siskind, David E.; Strickland, D. J.; Meier, R. R.; Majeed, T.; Eparvier, F. G. (1995), On the Relationship Between the Solar Soft X Ray Flux and Thermospheric Nitric Oxide: An Update with an Improved Photoelectron Model, J. Geophys. Res., 100(A10), 19687–19694, doi:10.1029/95JA01609.

Strickland, D. J.; Majeed, T.; Evans, J. S.; Meier, R. R.; Picone, J. M. (1997), Analytical representation of g factors for rapid, accurate calculation of excitation rates in the dayside thermosphere, J. Geophys. Res., 102(A7), 14485–14498, doi:10.1029/97JA00943.

Strickland, D. J., J. Bishop, J.S. Evans, T. Majeed, P.M. Shen, R.J. Cox, R. Link, R.E. Huffman (1999), Atmospheric Ultraviolet Radiance Integrated Code (AURIC): theory, software architecture, inputs, and selected results, Journal of Quantitative Spectroscopy & Radiative Transfer, 62(6), 689-742, doi:10.1016/S0022-4073(98)00098-3.

Swaminathan, P. K.; Strobel, D. F.; Kupperman, D. G.; Kumar, C. Krishna; Acton, L.; DeMajistre, R.; Yee, J.-H.; Paxton, L.; Anderson, D. E.; Strickland, D. J.; Duff, J. W. (1998), Nitric oxide abundance in the mesosphere/lower thermosphere region: Roles of solar soft X rays, suprathermal N(4S) atoms, and vertical transport, J. Geophys. Res., 103(A6), 11579–11594, doi:10.1029/97JA03249.

Strickland, D. J.; Evans, J. S.; Paxton, L. J (1995), Satellite Remote Sensing of Thermospheric O/N2 and solar EUV, 1. Theory, J. Geophys. Res., 10(A7), 12217–12226, doi:10.1029/95JA00574.