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21 to 30 of 510 Results
Dec 11, 2020
Sengupta, Agniv, 2020, "The Full Extent of El Niño’s Precipitation Influence on the United States and the Americas: The Sub-Optimality of the Niño 3.4 SST Index", https://doi.org/10.48577/jpl.1EXTNJ, Geophysical Research Letters, JPL Open Repository
Key features of El Niño’s influence on North American winter precipitation are well-known but we show that this influence has, hitherto, been sub-optimally characterized in winter, and especially in fall and spring. The sub-optimality has arisen from the historical over-reliance...
Dec 11, 2020
Romero-Wolf, Andrew, 2020, "Starshade Rendezvous: Exoplanet Sensitivity and Observing Strategy", https://doi.org/10.48577/jpl.ZCRLJO, Journal of Astronomical Instrumentation, JPL Open Repository
Launching a starshade to rendezvous with the Roman Space Telescope would provide the first opportunity to directly image the habitable zones of nearby sunlike stars in the coming decade. A report on the science and feasibility of such a mission was recently submitted to NASA as a...
Dec 10, 2020
Smith, Alvin L, 2020, "Biological Safety in the Context of Backward Planetary Protection and Mars Sample Return: Conclusions from the Sterilization Working Group", https://doi.org/10.48577/jpl.0QNM6N, International Journal of Astrobiology, JPL Open Repository
The National Aeronautics and Space Administration (NASA) and the European Space Agency (ESA) are studying how samples might be brought back to Earth from Mars safely. Backward planetary protection is key in this complex endeavor, as it is required to prevent potential adverse eff...
Dec 10, 2020
Stuart Shaklan, 2020, "Optical Verification Experiments of Sub-Scale Starshades", https://doi.org/10.48577/jpl.QGHOS4, Journal of Astronomical Telescope, Instrumentation, and Systems, JPL Open Repository
Starshades are a leading technology to enable the detection and characterization of Earth-like exoplanets. In this paper we report on optical experiments of sub-scale starshades that advance critical starlight suppression technologies in preparation for the next generation of spa...
Dec 9, 2020
Michael Mischna, 2020, "LES of the Martian convective boundary layer: Towards developing a new planetary boundary layer scheme", https://doi.org/10.48577/jpl.UUK3N3, Icarus, JPL Open Repository
The grid resolutions typically employed by atmospheric global circulation and mesoscale models are not sufficiently high to explicitly resolve the turbulence processes within the planetary boundary layer (PBL). Therefore, turbulence fluxes must be fully parameterized in global ci...
Dec 9, 2020
April Jewell, 2020, "End-to-end ground calibration and in-flight performance of the FIREBall-2 instrument", https://doi.org/10.48577/jpl.D5PKV0, Journal of Astronomical Telescope, Instrumentation, and Systems, JPL Open Repository
The payload of the Faint Intergalactic Redshifted Emission Balloon (FIREBall-2), the second generation15 of the FIREBall instrument (PI: C. Martin, Caltech), has been calibrated and launched from the NASA Columbia Sci16entific Balloon Facility (CSBF) in Fort Sumner, NM. FIREBall-...
Dec 9, 2020
Teixeira, Joaquim P, 2020, "Using Machine Learning to Model Uncertainty for Water-Vapor Atmospheric Motion Vectors", https://doi.org/10.48577/jpl.QVPEDH, Atmospheric Measurement Techniques, JPL Open Repository
Abstract. Wind-tracking algorithms produce Atmospheric Motion Vectors (AMVs) by tracking water vapor across spatial-temporal fields. Thorough error characterization (also known as uncertainty quantification) of wind-track algorithms is critical in properly assimilating AMVs into...
Dec 9, 2020
Ely, Todd A, 2020, "Radiometric Autonomous Navigation Fused with Optical for Deep Space Exploration", https://doi.org/10.48577/jpl.XZIQ6E, The Journal of the Astronautical Sciences, JPL Open Repository
With the advent of the Deep Space Atomic Clock, operationally accurate and re-liable one-way radiometric data sent from a radio beacon (i.e., a DSN antenna or other spacecraft) and collected using a spacecraft’s radio receiver enables the de-velopment and use of autonomous radio...
Dec 9, 2020
Neal Turner, 2020, "Physical and Chemical Structure of the Disk and Envelope of the Class 0/I protostar L1527", https://doi.org/10.48577/jpl.79UPJE, The Astrophyscial Journal, JPL Open Repository
Sub-millimeter spectral line and continuum emission from the protoplanetary disks and envelopes of protostars are powerful probes of their structure, chemistry, and dynamics. Here we present a benchmark study of our modeling code, RadChemT, that for the first time uses a chemical...
Dec 8, 2020
Fisher, Joshua B, 2020, "Once upon a time, in AmeriFlux", https://doi.org/10.48577/jpl.OL7ACP, Journal of Geophysical Research, JPL Open Repository
In October 2020, under COVID-19 quarantine, AmeriFlux held its largest and one of its most successful annual meetings . Historically, ~100 scientists attend; this meeting had over 400 registrants and participants. Participants expressed that this was among the best virtual meetin...
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