Improved atmospheric 3D BSDF model in earthlike exoplanet using ray-tracing based method

Dongok Ryu, Sug Whan Kim, Sehyun Seong

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


The studies on planetary radiative transfer computation have become important elements to disk-averaged spec- tral characterization of potential exoplanets. In this paper, we report an improved ray-tracing based atmospheric simulation model as a part of 3-D earth-like planet model with 3 principle sub-components i.e. land, sea and atmosphere. Any changes in ray paths and their characteristics such as radiative power and direction are com- puted as they experience reection, refraction, transmission, absorption and scattering. Improved atmospheric BSDF algorithms uses Q.Liu's combined Rayleigh and aerosol Henrey-Greenstein scattering phase function. The input cloud-free atmosphere model consists of 48 layers with vertical absorption profiles and a scattering layer with their input characteristics using the GIOVANNI database. Total Solar Irradiance data are obtained from Solar Radiation and Climate Experiment (SORCE) mission. Using aerosol scattering computation, we first tested the atmospheric scattering effects with imaging simulation with HRIV, EPOXI. Then we examined the computational validity of atmospheric model with the measurements of global, direct and diffuse radiation taken from NREL(National Renewable Energy Laboratory)s pyranometers and pyrheliometers on a ground station for cases of single incident angle and for simultaneous multiple incident angles of the solar beam.

Original languageEnglish
Title of host publicationInstruments, Methods, and Missions for Astrobiology XV
Publication statusPublished - 2012
EventInstruments, Methods, and Missions for Astrobiology XV - San Diego, CA, United States
Duration: 2012 Aug 142012 Aug 15

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherInstruments, Methods, and Missions for Astrobiology XV
Country/TerritoryUnited States
CitySan Diego, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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