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You searched on: Author: Keith Lykke

Displaying records 1 to 10 of 120 records.
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1. Comparison of two methodologies for calibrating satellite instruments in the visible and near-infrared
Published: 12/10/2015
Authors: Steven W Brown, Keith R. Lykke, Robert A. Barnes, Bruce Guenther, James J Butler, Thomas Schwarting, David Moyer, Frank DeLuccia, Christopher Moeller
Abstract: Traditionally, satellite instruments that measure Earth-reflected solar radiation in the visible and near infrared wavelength regions have been calibrated for radiance responsivity in a two-step method. In the first step, the relative spectral respo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918209

2. A Comparison of MODTRAN5 Atmospheric Extinction Predictions with Narrowband Astronomical Flux Observations
Published: 9/1/2015
Authors: Claire Elizabeth Cramer, John Taylor Woodward IV, Keith R. Lykke, Christopher W. Stubbs, Amali Vaz, Gerald T Fraser
Abstract: Improving the precision of ground-based astronomical observations is an objective of both current (e.g. PanSTARRS1) and future (e.g. Dark Energy Survey and the Large Synoptic Survey Telescope) sky surveys. An important element of this effort is to de ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911797

3. CALIBRATION AND CHARACTERIZATION OF A SEAPRISM RADIOMETER FOR AERONET-OC
Published: 6/19/2015
Authors: Bettye C Johnson, Steven W Brown, John Taylor Woodward IV, Keith R. Lykke, Giuseppe Zibordi
Abstract: The global Aerosol Robotic Network for Ocean Color (AERONET-OC) program utilizes AERONET CE-318 sun photometers (termed ,SeaPRISMsŠ) modified for in-air observations of ocean waters situated on oil drilling rigs, off-shore lighthouses, or other platf ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918818

4. SI-Traceable Calibrations of Celestial Objects
Published: 5/14/2015
Authors: Keith R. Lykke, Claire Elizabeth Cramer, John Taylor Woodward IV
Abstract: Photometric calibration is currently the leading source of systematic uncertainty in supernova surveys that aim to determine the nature of dark energy. The bulk of this uncertainty is due to imperfect knowledge of the spectral energy distribution ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911741

5. The Cosmic Infrared Background Experiment (CIBER): The Low Resolution Spectrometer
Published: 5/14/2015
Authors: K. Tsumura, T. Aria, J. Battle, J. Bock, Steven W Brown, A. Cooray, V. Hristov, B. Keating, M. G. Kim, D. H. Lee, L. R. Levenson, Keith R. Lykke, P. Mason, T. Matsumoto, S. Matsuura, K. Murata, U. W. Nam, T. Renbarger, Allan W. Smith, I. Sullivan, K. Suzuki, T. Wada, M. Zemcov, U. W. Nam, B. Shultz, I. Sullivan, P. M. Korngut
Abstract: Absolute spectrophotometric measurements of diffuse radiation at 1−2 μm are crucial to our understanding of the radiative content of the Universe from nucleosynthesis since the epoch of reionization, the composition and structure of the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910002

6. Precise Measurement of Lunar Spectral Irradiance at Visible Wavelengths
Series: Journal of Research (NIST JRES)
Report Number: 118.020
Published: 11/12/2013
Authors: Keith R. Lykke, John Taylor Woodward IV, Allan W. Smith, Claire Elizabeth Cramer
Abstract: We report a measurement of lunar spectral irradiance with an uncertainty below 1 % from 420 nm to 1000 nm. This measurement uncertainty meets the stability requirement for many climate data records derived from satellite images, including tho ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913841

7. Using a Tunable Ultraviolet Laser for the Inactivation of Water Pathogens
Published: 9/22/2013
Authors: Thomas C Larason, Keith R. Lykke, Ping-Shine Shaw, Lin Chungsan
Abstract: Ultraviolet (UV) radiation effectively inactivates common pathogens found in ground and surface waters such as Cryptosporidium, Giardia, and most bacterial pathogens (e.g. E. coli). Water treatment facilities are now using UV radiation for disinfect ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914548

8. A novel apparatus to measure reflected sunlight from the Moon
Published: 9/19/2013
Authors: Claire Elizabeth Cramer, Gerald T Fraser, Keith R. Lykke, John Taylor Woodward IV, Alan W. Smith
Abstract: We describe a new apparatus for measuring the spectral irradiance of the Moon at visible wavelengths. Our effort builds upon the United States Geological Survey‰s highly successful Robotic Lunar Observatory (ROLO), which determined a precise model fo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914538

9. The Cosmic Infrared Background Experiment (CIBER): the Narrow Band Spectrometer
Published: 8/19/2013
Authors: Steven W Brown, Keith R. Lykke, Allan W. Smith, P M. Korngut, T. Renbarger, T. Arai, J. Battle, A. Cooray, V. Hristov, B. Keating, M. G. Kims, A. Lanz, D. H. Lee, L. R. Levenson, P. Mason, T. Matsumoto, S. Matsuura, U. W. Niam, B. Shultz, I. Sullivan, K. Tsumura, T. Wada, M. Zemcov
Abstract: We have developed a near-infrared spectrometer designed to measure the absolute intensity of the Solar 854.2 nm Ca II Fraunhofer line, scattered by interplanetary dust, in the Zodiacal light spectrum. Based on the known equivalent line width in the S ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912115

10. New Instruments to Calibrate Atmospheric Transmission
Published: 9/17/2012
Authors: Claire Elizabeth Cramer, Keith R. Lykke, John Taylor Woodward IV, Peter Zimmer, John T McGraw, Daniel C Zirzow
Abstract: Changing atmospheric transmission accounts for the largest systematic errors limiting photometric measurement precision and accuracy for ground-based telescopes. While considerable resources have been devoted to correcting the effects of the atmo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913048



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