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 language | English |
|---|---|
| Title of host publication | UV/Optical/IR Space Telescopes and Instruments |
| Subtitle of host publication | Innovative Technologies and Concepts V |
| DOIs | |
| Publication status | Published - 2011 Nov 7 |
| Event | UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V - San Diego, CA, United States Duration: 2011 Aug 21 → 2011 Aug 24 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 8146 |
| ISSN (Print) | 0277-786X |
Other
| Other | UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V |
|---|---|
| Country | United States |
| City | San Diego, CA |
| Period | 11/8/21 → 11/8/24 |
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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
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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 proceeding › Conference contribution
TY - GEN
T1 - Real scale ray-tracing simulation of space earthshine measurement with improved BRDF model of lunar surface
AU - Yu, Jinhee
AU - Ryu, Dong Ok
AU - Ahn, Sung Ho
AU - Kim, Sug-Whan
PY - 2011/11/7
Y1 - 2011/11/7
N2 - 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.
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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U2 - 10.1117/12.893367
DO - 10.1117/12.893367
M3 - Conference contribution
SN - 9780819487568
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - UV/Optical/IR Space Telescopes and Instruments
ER -