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  • 1
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    Solar photochemistry using the space shuttle (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A continuing source of difficulty in cometary astrophysics is understanding the origin of C2, C3, NH and CO(+) species in comets. An experiment is proposed to investigate these problems by continuously releasing suspected parent gases from the space shuttle and using a dye laser to selectively excite fragments produced as a result of solar photochemical decomposition of the molecules. The backscattered fluorescence is gathered by a telescope, spectrally filtered, and measured as a function of time after the laser pulse.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA. Marshall Space Flight Center Proc. of the Shuttle-Based Cometary Sci. Workshop; p 118-136
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  • 2
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    Determination of diffuse radiation characteristics for application in solar energy harvesting and Low cost, large area solar simulation and Low cost, AM2 simulator (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: GENERAL
    Type: Terrest. Photovoltaic Meas.; p 86-105
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  • 3
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    Vibronic effects in the predissociation of the C/1/Pi/u state of C2N2 (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The partitioning of excess photochemical energy as a function of the vibrational energy of the state of C2N2 has been measured. Surprisal theory has been used to analyze the data and it shows that complete randomization does not occur before dissociation. The results are also inconsistent with the predictions of the quasidiatomic theory for photodissociation.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 71; Dec. 1
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  • 4
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    Variationally consistent approximation scheme for charge transfer (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The author has developed a technique for testing various charge-transfer approximation schemes for consistency with the requirements of the Kohn variational principle for the amplitude to guarantee that the amplitude is correct to second order in the scattering wave functions. Applied to Born-type approximations for charge transfer it allows the selection of particular groups of first-, second-, and higher-Born-type terms that obey the consistency requirement, and hence yield more reliable approximation to the amplitude.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Physical Review A - General Physics; vol. 18
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  • 5
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    Spectral distribution of direct and diffuse solar energy received at sea level of a model atmosphere (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: GENERAL
    Type: SR-320-3332 , NASA. Lewis Res. Center Terrest. Photovoltaic Meas.; p 159-167
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  • 6
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    The Atacama Cosmology Telescope: The Polarization-Sensitive ACTPol Instrument (2016)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The Atacama Cosmology Telescope (ACT) makes high angular resolution measurements of anisotropies in the Cosmic Microwave Background (CMB) at millimeter wavelengths. We describe ACTPol, an upgraded receiver for ACT, which uses feedhorn-coupled, polarization-sensitive detector arrays, a 3deg field of view, 100 mK cryogenics with continuous cooling, and meta material antireflection coatings. ACTPol comprises three arrays with separate cryogenic optics: two arrays at a central frequency of 148 GHz and one array operating simultaneously at both 97 GHz and 148 GHz. The combined instrument sensitivity, angular resolution, and sky coverage are optimized for measuring angular power spectra, clusters via the thermal Sunyaev-Zel'dovich (SZ) and kinetic SZ signals, and CMB lensing due to large-scale structure. The receiver was commissioned with its first 148 GHz array in 2013, observed with both 148 GHz arrays in 2014, and has recently completed its first full season of operations with the full suite of three arrays. This paper provides an overview of the design and initial performance of the receiver and related systems.
    Keywords: Astronomy
    Type: GSFC-E-DAA-TN38116 , The Astrophysical Journal Supplement Series; 227; 2; 21
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  • 7
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    Satellite Sea Ice Measurements in the Arctic Ocean (2016)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Satellite observations sustained since 1979 have been the primary source of information to reveal Arctic Ocean sea ice extent is diminishing rapidly. Sea ice is also thinning based on historical surface and near-surface records and more recent satellite retrievals. There is a new normal environment in the Arctic environment with substantial socio-economic impacts. A key question is: What are the spatial and temporal characteristics of the sea ice thickness distribution throughout the annual cycle, and what is the evolving inter-annual trend? Arctic Ocean sea ice conditions have been determined with passive microwave radiometer, active scatterometer and other satellite instrument measurements recorded by a continuing series of satellites. An important feature of the continuous time series measurements has been the overlap of each new satellite dataset with ongoing measurements so as to provide adequate time intervals for calibration and validation. Satellite instrument diversity has provided both coarse spatial resolution measurements over the entire Arctic Ocean for long-period time series and limited-duration fine spatial resolution data over selected regions for navigation and other applications. Satellite observations of Arctic Ocean sea ice will continue to increase in importance because predictability of sea ice is poor and societal interest is great. Unfortunately, however the sustainability of some critical elements of the current Arctic Ocean satellite measurement suite beyond 2020 remains uncertain, e.g., after the CryoSat-2 and ICESat-2 missions have concluded.
    Keywords: Earth Resources and Remote Sensing
    Type: JPL-CL-16-2189 , 8th Asia/Oceania Meteorological Satellite Users'' Conference; Jun 08, 2016 - Jun 09, 2016; Biot; France
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  • 8
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    Ultrasoft X-rays from the southern galactic hemisphere (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Results are reported for sounding-rocket measurements of the X-ray background at ultrasoft energies (90 to 280 eV) in selected regions of the southern galactic hemisphere. The spectrum of the background is found to be extremely soft, being characterized by a kinetic temperature of less than 100 eV in thermal models. A lower limit of about 0.2 per cu pc is set on the space density of stellar sources in a discrete-source model for the background. The results show that the observed background radiation in the southern galactic hemisphere is about 50% less intense than that sampled at corresponding northern latitudes, the intensity at energies less than 150 eV varies along the scan path and is strongest south of -60 deg, there is no evidence for the existence of any ultrasoft pointlike sources, and the background is probably diffuse in origin. A temperature of about 600,000 K and an electron density of the order of 0.007 per cu cm are derived from a simple model where the radiation originates in a hot interstellar plasma interspersed with cold gas along the line of sight.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 211; Jan. 1
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  • 9
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    Tunable VUV photofragment monochromator (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A versatile tunable VUV photofragment monochromator is described. The instrument uses a unique flashlamp and a single slit monochromator to produce the photofragments. A tunable dye laser is used to detect these fragments via laser induced fluorescence. The results of preliminary design parameter measurements are presented along with the first photofragment spectra obtained with this instrument. It is shown that the SNR is adequate to assign single quantum state photofragment distributions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 17; Sept. 1
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  • 10
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    How Well Did Measurements of Surface Winds in the 2015 El Nino Match Similar Observations Recorded in the Four Previous El Nino Events? (2015)
    In:  Other Sources
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    Publication Date: 2019-08-26
    Description: No abstract available
    Keywords: Meteorology and Climatology; Oceanography
    Type: AGU 2015 Fall Meeting; Dec 14, 2015 - Dec 18, 2015; San Francisco, CA; United States
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