Real scale ray-tracing simulation of space earthshine measurement with improved BRDF model of lunar surface

Jinhee Yu, Dong Ok Ryu, Sung Ho Ahn, Sug-Whan Kim

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

1 Citation (Scopus)

Abstract

The discrepancy in annual changes of Earth albedo anomaly among the Had3CM prediction, ground and low Earth orbit measurements attracts great academic attention world-wide. As a part of our on-going study for better understanding of such discrepancy, we report a new earthshine measurement simulation technique. It combines the light source (the Sun), targets (the Earth and the Moon) and a hypothetical detector in a real scale Integrated Monte-Carlo Ray Tracing (IRT) computation environment. The Sun is expressed as a Lambertian scattering sphere, emitting 1.626x1026W over 400nm- 750nm in wavelength range. Whilst we are in the process of developing a complex Earth model consisting of land, sea and atmosphere with appropriate BRDF models, a simplified Lambertian Earth surface with 0.3 in uniform albedo was used in this study. For the moon surface, Hapke's BRDF model is used with double Henry-Green phase function. These elements were then imported into the IRT computation of radiative transfer between their surfaces. First, the irradiance levels of earthshine and moonshine lights were computed and then confirmed that they agree well with the measurement data from Big Bear Solar Observatory. They were subsequently used in determination of the Earth bond albedo of about 0.3 that is almost identical to the input Earth albedo of 0.3. These computations prove that, for the first time, the real scale IRT model was successfully deployed for the Earthshine measurement simulation and, therefore, it can be applicable for other ground and space based measurement simulation of reflected lights from the Earth and the Moon.

Original languageEnglish
Title of host publicationUV/Optical/IR Space Telescopes and Instruments
Subtitle of host publicationInnovative Technologies and Concepts V
DOIs
Publication statusPublished - 2011 Nov 7
EventUV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V - San Diego, CA, United States
Duration: 2011 Aug 212011 Aug 24

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8146
ISSN (Print)0277-786X

Other

OtherUV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V
CountryUnited States
CitySan Diego, CA
Period11/8/2111/8/24

Fingerprint

lunar surface
Ray Tracing
Ray tracing
ray tracing
Earth (planet)
Earth albedo
Moon
Simulation
Sun
simulation
Discrepancy
moon
albedo
luminaires
sun
Henry
Model
Radiative Transfer
Irradiance
solar observatories

All Science Journal Classification (ASJC) codes

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

Cite this

Yu, J., Ryu, D. O., Ahn, S. H., & Kim, S-W. (2011). Real scale ray-tracing simulation of space earthshine measurement with improved BRDF model of lunar surface. In UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V [81460X] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8146). https://doi.org/10.1117/12.893367
Yu, Jinhee ; Ryu, Dong Ok ; Ahn, Sung Ho ; Kim, Sug-Whan. / Real scale ray-tracing simulation of space earthshine measurement with improved BRDF model of lunar surface. UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V. 2011. (Proceedings of SPIE - The International Society for Optical Engineering).
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Yu, J, Ryu, DO, Ahn, SH & Kim, S-W 2011, Real scale ray-tracing simulation of space earthshine measurement with improved BRDF model of lunar surface. in UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V., 81460X, Proceedings of SPIE - The International Society for Optical Engineering, vol. 8146, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V, San Diego, CA, United States, 11/8/21. https://doi.org/10.1117/12.893367

Real scale ray-tracing simulation of space earthshine measurement with improved BRDF model of lunar surface. / Yu, Jinhee; Ryu, Dong Ok; Ahn, Sung Ho; Kim, Sug-Whan.

UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V. 2011. 81460X (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8146).

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

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AB - The discrepancy in annual changes of Earth albedo anomaly among the Had3CM prediction, ground and low Earth orbit measurements attracts great academic attention world-wide. As a part of our on-going study for better understanding of such discrepancy, we report a new earthshine measurement simulation technique. It combines the light source (the Sun), targets (the Earth and the Moon) and a hypothetical detector in a real scale Integrated Monte-Carlo Ray Tracing (IRT) computation environment. The Sun is expressed as a Lambertian scattering sphere, emitting 1.626x1026W over 400nm- 750nm in wavelength range. Whilst we are in the process of developing a complex Earth model consisting of land, sea and atmosphere with appropriate BRDF models, a simplified Lambertian Earth surface with 0.3 in uniform albedo was used in this study. For the moon surface, Hapke's BRDF model is used with double Henry-Green phase function. These elements were then imported into the IRT computation of radiative transfer between their surfaces. First, the irradiance levels of earthshine and moonshine lights were computed and then confirmed that they agree well with the measurement data from Big Bear Solar Observatory. They were subsequently used in determination of the Earth bond albedo of about 0.3 that is almost identical to the input Earth albedo of 0.3. These computations prove that, for the first time, the real scale IRT model was successfully deployed for the Earthshine measurement simulation and, therefore, it can be applicable for other ground and space based measurement simulation of reflected lights from the Earth and the Moon.

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Yu J, Ryu DO, Ahn SH, Kim S-W. Real scale ray-tracing simulation of space earthshine measurement with improved BRDF model of lunar surface. In UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V. 2011. 81460X. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.893367