A5020168456- Planetary Science and Exploration
- Astro and Planetary Science
- Spacecraft and Cryogenic Technologies
- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Meteorological Phenomena and Simulations
- Precipitation Measurement and Analysis
- Soil Moisture and Remote Sensing
- Ionosphere and magnetosphere dynamics
- Isotope Analysis in Ecology
- Atmospheric Ozone and Climate
- Scientific Research and Discoveries
- Advanced Frequency and Time Standards
- Nuclear Physics and Applications
- Calibration and Measurement Techniques
- Radio Astronomy Observations and Technology
- Atmospheric aerosols and clouds
- Arctic and Antarctic ice dynamics
- Space Exploration and Technology
- Space Science and Extraterrestrial Life
- Climate variability and models
- Radio Wave Propagation Studies
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Mass Spectrometry Techniques and Applications
Jet Propulsion Laboratory
2011-2025
California Institute of Technology
1995-2015
Université de Versailles Saint-Quentin-en-Yvelines
2014
Sorbonne Université
2014
Université Paris Cité
2014
Observatoire de Paris
2014
Centre National de la Recherche Scientifique
2014
Délégation Paris 7
2014
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2014
Ball (United States)
1995
Heat transport and ice sublimation in comets are interrelated processes reflecting properties acquired at the time of formation during subsequent evolution. The Microwave Instrument on Rosetta Orbiter (MIRO) maps subsurface temperature comet 67P/Churyumov-Gerasimenko, 1.6 mm 0.5 wavelengths, spectra water vapor. total H2O production rate varied from 0.3 kg s(-1) early June 2014 to 1.2 late August showed periodic variations related nucleus rotation shape. Water outgassing was localized "neck"...
We have developed a tunable temperature profiler based on highly stable synthesizer that can observe at multiple frequencies the shoulder of 60‐GHz atmospheric oxygen feature. are developing similar radiometer to obtain vertical distribution water vapor by making observations pressure‐broadened line from 22 29 GHz. Information cloud liquid profiles is also contained in these two wave bands. Various mathematical retrieval methods for temperature, vapor, and were tested designs. These include...
For pt.II see ibid., vol.33, no.1, p.138-46 (1995). The sole mission function of the TOPEX/Poseidon microwave radiometer (TMR) is to provide corrections for altimeter range errors induced by highly variable atmospheric water vapor content. three TMR frequencies are shown be near-optimum measuring vapor-induced path delay within an environment cloud cover and sea surface flux background. After a review underlying physics relevant prediction 5-40 GHz nadir-viewing brightness temperatures,...
We present estimates for the mean bias of TOPEX/POSEIDON NASA altimeter (ALT) and Centre National d'Etudes Spatiales (SSALT) using in situ data gathered at Platform Harvest during first 36 cycles mission. Data 21 overflights ALT six SSALT have been analyzed. The analysis includes an independent assessment measurements sea level, radial component orbit, wet tropospheric path delay, ionospheric delay. (The sign convention used this paper is such that, to correct geophysical record values add...
Observations of the nucleus 67P/Churyumov-Gerasimenko in millimeter-wave continuum have been obtained by Microwave Instrument for Rosetta Orbiter (MIRO). We present data at wavelengths 0.5 mm and 1.6 during September 2014 when was heliocentric distances between 3.45 3.27 AU. The are fit to simple models thermal emission order characterize observed behavior make quantitative estimates important physical parameters, including inertia absorption properties MIRO wavelengths. brightness...
Aims. We present the spatial and diurnal variation of water outgassing on comet 67P/Churyumov-Gerasimenko using H216O rotational transition line at 556.936 GHz observed from Rosetta/MIRO in August 2014.
The TOPEX/Poseidon microwave radiometer (TMR) is a three-frequency flown on the (T/P) satellite in low Earth orbit. It operates at 18, 21, and 37 GHz nadir-only viewing direction which co-aligned with T/P radar altimeters. TMR monitors corrects for propagation path delay of altimeter signal due to water vapor nonprecipitating liquid atmosphere. paper describes instrument radiometric calibration required derive antenna temperature (T/sub A/) from raw digital data. T/sub A/ precision 0.4 K...
Results of the in‐flight calibration and performance evaluation campaign for TOPEX/POSEIDON microwave radiometer (TMR) are presented. Intercomparisons made between TMR various sources ground truth, including ground‐based water vapor radiometers, radiosondes, global climatological models, special sensor imager data over Amazon rain forest, models clear, calm, subpolar ocean regions. After correcting preflight errors in processing thermal/vacuum data, relative channel offsets open brightness...
The high obliquity (~50°) of comet 67P/Churyumov-Gerasimenko (67P) is responsible for a long-lasting winter polar night in the southern regions nucleus. We report observations made with submillimeter and millimeter continuum channels Microwave Instrument onboard Rosetta Orbiter (MIRO) thermal emission from these during period August-October 2014. Before observations, had been darkness approximately five years. Subsurface temperatures range 25−50 K are measured. Thermal model calculations...
We present new model predictions of the earth-directed microwave brightness temperatures (TB) moon with dependence on phase angle over wavelength range 1 mm – 10 cm. Both disk average and global maps are included. The models based detailed thermophysical property retrievals provided by Apollo in situ measurements, Diviner Chang E'2 (CE2) high quality pre-Apollo earth-based observations. Of particular importance advances electrical (loss tangent) determinations CE2 lunation amplitude data. A...
The stability and accuracy of the TOPEX Microwave Radiometer (TMR) measurement atmospheric path delay due to water vapor is assessed over interval from launch (August 1992) through June 1998. Detailed global comparisons are made with delays derived special sensor microwave imager (SSM/I) instruments a network 15 island radiosondes. results provide consistent evidence that TMR measurements included an instrument-related downward drift 1.0-1.5 mm/yr between October 1992 December 1996....
Earth-based observations of the lunar microwave brightness temperature spectrum at wavelengths between 5 and 500 centimeters, when reexamined in light physical property data derived from Apollo program, tentatively support high heat flows measured situ indicate that a regolith thickness 10 30 meters may characterize large portion near side.