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Hitran-PC 5.0

  

Developed by the University of South Florida, exclusive distribution by Ontar Corporation(Released September 10, 2009) Hitran-PC is a PC computer program that can calculate or model the high-resolution ( < 0.01 cm-1 ) optical transmission spectrum of the atmosphere and of selected gases using primarily the HITRAN Line-by-Line database. Hitran-PC has been developed over the past 30 years, with various levels of improvements and capability, starting with Version 1.0 in 1991. The latest version, Hitran-PC 5.0, incorporates updates to the internal structure of the program which enabled much faster execution times and allowed combining of line-by-line spectra in a real time format making it possible to switch between individual lines and subsequent isotope, molecule totals and composite without recalculations. Additional databases were added including line-by-line and cross-sectional GEISA, and the online EPA and the Max Plank database of UV and visible spectra for added capabilities. Various other changes and interface improvements have been implemented as well.
 

The overall operation of Hitran-PC 5.0 is shown in the following figure. As can be seen, the user can specify the path length, temperature, concentration, line shape (Pressure, Voigt, etc.), and other parameters pertaining to the transmission of the atmosphere. These startup parameters can also be stored in a configuration file for easy use at a later time. The startup parameters are then used along with atmospheric models of pressure/temperature/altitude to model the geometry of the optical transmission path through the gas or atmosphere. Both horizontal and slant path spectral calculations can be made. 

Hitran 5.0 Manual

Hitran-PC 5.0 operation

Additional Information

The databases and spectral calculations used by Hitran-PC 5.0 consist of:

  1. The main HITRAN Line-by-Line (LBL) database consisting of about several million individual absorption lines of gases in the atmosphere (modeled with a spectral resolution greater than 0.001 cm-1),
  2. The experimental PNNL database of environmental and chemical gases for about 400 gases (with a spectral resolution on the order of 0.1 cm-1),
  3. The Continuum models for the far-wings of water vapor, CO2, and N2 that add up to a few percent attenuation over a wide spectral range,
  4. The HITRAN cross section models that give the attenuation for UV and IR gases, and
  5. The BACKSCAT (Version 4.0) attenuation due to aerosols (clouds, fogs, dust, etc.), for further use by the user.

New Features in Hitran-PC 5.0

  • Support of the expanded HITRAN 2012 database
  • Support of the GEISA database added
  • Ability of simultaneous HITRAN and GEISA calculations with real time spectra      comparison.
  • Cross-sectional data from GEISA supported
  • MPI Mainz UV-VIS Atlas spectral cross-sectional data support added
  • AEDC  / EPA quantitative molecular database supported
  • Embedded web- browser for selected databases access (EPA / AEDC, Max Plank      Institute -Mainz UV-VIS Atlas)
  • Real time line-by-line spectral decomposition
  • The most common versions of *.SPC Thermo galactic spectral format supported.
  • PNNL database handling improved by using the *.SPC spectral files
  • Calculation speed improved (up to ~25 times)
  • Ability to extend atmospheric models with new molecules
  • Advanced slant path geometry editor introduced
  • Slant path recalculation method improved to include more complex sensing geometries
  • New options for slant path layering
  • Ability to change the radius of the planet for slant path geometry calculations
  • Isotopes abundances profiles introduced
  • Numerous interface improvements

Hitran-pc 5.0 interface & graphs

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