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  • 1
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    Radar and Optical Observations of Asteroid 1998 KY26 (1999)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Observations of near-Earth asteroid 1998 KY26 shortly after its discovery reveal a slightly elongated spheroid with a diameter of about 30 m, a composition analogous to carbonaceous chondritic meteorites, and a rotation period of 10.7 minutes, which is an order of magnitude shorter that that measured for any other solar system object.
    Keywords: Communications and Radar
    Type: Science
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Slowly rotating asteroid 1999 GU/sub 3 (2000)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Optical and radar observations reveal that 1999 GU3 is subkilometer-sized object with a synodic period of 9.0 days, low visual and radar albedos, and colors more consistent with the ordinarychondrites than the vast majority of main-belt asteroids.
    Keywords: Communications and Radar
    Type: ICARUS; Volume 148; 589-593
    Format: text
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  • 3
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    Lessons Learned from Flight Observations of the GOES-R Magnetometer (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Geostationary Operational Environmental Satellite (GOES)-16 observatory was launched on 19 November 2016. During daily on-orbit operations, shadowing of the inboard magnetometer sensor unit occurs due to spacecraft geometry and solar angle. Throughout the shadowing periods of the inboard magnetometer, anomalous excursions of 20 nanotesla (nT) are observed. In addition to the excursions during shadow events, the measurement difference between the inboard and outboard magnetometer varies over the day, indicating erroneous measurements by one or both magnetometers. In addition, based on the deployment rotations, the zero offsets of the X and Y axes were found to be significantly different, ~30nT, from ground calibration data. Because of these observations, an extensive root cause investigation was undertaken to correct the magnetometer system for the next spacecraft in the GOES-R series. This paper documents the efforts of that activity and the lessons learned as a result of the investigation.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN68765 , 2019 ESA Workshop on Aerospace EMC; May 20, 2019 - May 22, 2019; Budapest; Hungary
    Format: application/pdf
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  • 4
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    Lifetimes in Si CVD-epitaxial and other layers determined by spectral LBIC (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In an effort to evaluate the minority carrier lifetimes in CVD-epitaxially grown layers in their dependence on the CVD process variables, the absolute spectral LBIC method was found to be the only available method capable of yielding both lifetime and surface recombination velocity in layers, independent of the resistivity of this layer or that of the substrate, as long as they are separated by a pn-junction. With this method, it was not only possible to determine the minority carrier lifetimes in as-grown epi-layers, but to observe their changes through the device fabrication processes. In addition, it was possible for the first time to determine the lifetimes in the alloy-regrowth p(+) layers of base high/low junction structures.
    Keywords: SOLID-STATE PHYSICS
    Type: Photovoltaic Specialists Conference; May 01, 1984 - May 04, 1984; Kissimmee, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Measurement of minority carrier lifetimes and surface recombination velocities in solar cells (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A generic comparison has been carried out of all methods for recombination parameter determination that are based on measurement of a current and/or voltage in either steady-state, transient, or frequency-dependent approaches. The theoretical background for the time-dependent methods has been extended from prior work to include drift fields and be applicable to compound (multilayered) regions. The key findings were: (1) all methods have essentially the same limitations to determination of only the dominant recombination parameters; (2) open-circuit measurements have more sensitivity to the recombination parameters than short circuit measurements, but they present much more difficulty in eliminating spurious effects; (3) transient and frequency-dependent methods have exactly the same expressions for the relaxation constants and the breakpoint frequencies; and (4) in compound regions there exists only one set of relaxation constants for all the coupled layers. These constants include all relevant parameters of these layers. It is thus difficult to separate these parameters in time- or frequency-domain measurements. ASLBIC seems still to be the most suitable method for determination of emitter parameters.
    Keywords: SOLID-STATE PHYSICS
    Type: IEEE Photovoltaic Specialists Conference; May 04, 1987 - May 08, 1987; New Orleans, LA; United States
    Format: text
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  • 6
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    Lessons Learned from Flight Observations of the GOES-R Magnetometer (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Geostationary Operational Environmental Satellite (GOES)-16 observatory was launched on 19 November 2016. During daily on-orbit operations, shadowing of the inboard magnetometer sensor unit occurs due to spacecraft geometry and solar angle. Throughout the shadowing periods of the inboard magnetometer, anomalous excursions of 20 nanotesla (nT) are observed. In addition to the excursions during shadow events, the measurement difference between the inboard and outboard magnetometer varies over the day, indicating erroneous measurements by one or both magnetometers. In addition, based on the deployment rotations, the zero offsets of the X and Y axes were found to be significantly different, ~30nT, from ground calibration data. Because of these observations, an extensive root cause investigation was undertaken to correct the magnetometer system for the next spacecraft in the GOES-R series. This paper documents the efforts of that activity and the lessons learned as a result of the investigation.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN64892 , 2019 ESA Workshop on Aerospace EMC; May 20, 2019 - May 22, 2019; Budapest; Hungary
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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