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Article

A Study of Lunar Microwave Radiation Based on Satellite Observations

by 1,* and 2
1
Cooperative Institute for Satellite Earth System Studies (CISESS), University of Maryland, 5825 University Research Court, Suite 4001, College Park, MD 20740-3823, USA
2
Faculty of Mathematics, Informatics and Natural Sciences, Department of Earth Sciences, Meteorological Institute, Universität Hamburg, Bundesstraße 55, 20146 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(7), 1129; https://doi.org/10.3390/rs12071129
Received: 7 February 2020 / Revised: 19 March 2020 / Accepted: 26 March 2020 / Published: 2 April 2020
In recent years, the study of microwave radiation from the Moon’s surface has been of interest to the astronomy and remote sensing communities. Due to the stable geophysical properties of the Moon’s surface, microwave lunar radiation is highly predictable and can be accurately modeled, given sufficient observations from reliable instruments. Specifically, for microwave remote sensing study, if International System of Unit (SI) traceable observations of the Moon are available, the Moon can thus be used as an SI traceable calibration reference for microwave instruments to evaluate their calibration accuracies and assess their long-term calibration stabilities. Major challenges of using the Moon as a radiometric source standard for microwave sensors include the uncertainties in antenna pattern measurements, the reliability of measurements of brightness temperature (Tb) in the microwave spectrum of the lunar surface, and knowledge of the lunar phase lag because of penetration depths at different detection frequencies. Most microwave-sounding instruments can collect lunar radiation data from space-view observations during so-called lunar intrusion events that usually occur several days each month. Addressed in this work based on Moon observations from the Advanced Technology Microwave Sounder and the Advanced Microwave Sounding Unit/Microwave Humidity Sounder are two major issues in lunar calibration: the lunar surface microwave Tb spectrum and phase lag. The scientific objective of this study is to present our most recent progress on the study of lunar microwave radiation based on satellite observations. Reported here are the lunar microwave Tb spectrum and phase lag from 23 to 183 GHz based on observations of microwave-sounding instruments onboard different satellite platforms. For current Moon microwave radiation research, this study can help toward better understanding lunar microwave radiation features over a wide spectrum range, laying a solid foundation for future lunar microwave calibration efforts. View Full-Text
Keywords: microwave radiometer; lunar calibration; brightness temperature; phase lag microwave radiometer; lunar calibration; brightness temperature; phase lag
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MDPI and ACS Style

Yang, H.; Burgdorf, M. A Study of Lunar Microwave Radiation Based on Satellite Observations. Remote Sens. 2020, 12, 1129. https://doi.org/10.3390/rs12071129

AMA Style

Yang H, Burgdorf M. A Study of Lunar Microwave Radiation Based on Satellite Observations. Remote Sensing. 2020; 12(7):1129. https://doi.org/10.3390/rs12071129

Chicago/Turabian Style

Yang, Hu, and Martin Burgdorf. 2020. "A Study of Lunar Microwave Radiation Based on Satellite Observations" Remote Sensing 12, no. 7: 1129. https://doi.org/10.3390/rs12071129

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