101. A Model of Entrance Pupil Irradiance Estimation of the Multi-pixel Sensor on a Moon-based Earth Radiation Observatory
- Author
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Wentao Duan and Shuanggen Jin
- Subjects
Entrance pupil ,Selenographic coordinates ,Observatory ,Radiance ,Longwave ,Irradiance ,Satellite ,Shortwave ,Geology ,Remote sensing - Abstract
A Moon-based Earth radiation observatory (MERO) could provide a longer-term continuous measurement of radiation exiting the Earth system compared to current satellite-based observatories. In order to parameterize the multi-pixel detector for such a newly-proposed MERO, which could provide high-quality spatial-temporal image, the evaluation of the entrance pupil irradiance (EPI) for each pixel is of great importance, since such EPI is an important parameter that is used to optimize MERO sensor design for the best data quality. The motivation of this work is to build an EPI estimating model for a multi-pixel MERO instrument. The rationale of this model is to sum the contributions of every location in the MERO-viewed region on the Earth’s top of atmosphere (TOA) to a MERO pixel’s EPI with considering the anisotropy in the radiance at the Earth TOA. Such anisotropy could be characterized by the TOA anisotropic factors, which can be derived from the Clouds and the Earth’s Radiant Energy System (CERES) angular distribution models (ADMs). Furthermore, we estimated the shortwave (SW) (0.2–5 µm) and longwave (LW) (5–100 µm) EPIs variation for a hypothetic MERO instrument located at the Apollo 15 landing site (selenographic coordinates: 3.628°E, 26.133°N) during a month, taking into account the effects of Earth TOA radiation changing, Moon’s orbiting around the Earth and variation of Moon’s orbit. In addition, we also evaluate the effects of MERO’s selenographic location on the EPIs by calculating the SW and LW EPIs range for any given location sensor within the MERO-deployable region (region of 80.5°W–80.5°E and 81.5°S–81.5°N on the nearside of the Moon).
- Published
- 2019