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  • 1
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    Tide gauge observations of the Indian Ocean tsunami, December 26, 2004 (2005)
    In:  Geophys. Res. Lett., Luxembourg, Conseil de l'Europe, vol. 32, no. 9, pp. 245-254, pp. L09603, (ISSN: 1340-4202)
    Details
    Publication Date: 2005
    Keywords: Tsunami(s) ; Earthquake ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Seismic discrimination in southern Xinjiang: The 13 March 2003 Lop Nor earthquake (2005)
    In:  Bull. Seism. Soc. Am., Luxembourg, Deutsche Geophys. Gesellschaft, vol. 95, no. 1, pp. 197-211, pp. B09316, (ISSN: 1340-4202)
    Details
    Publication Date: 2005
    Keywords: Seismology ; Earthquake ; China ; Discrimination ; Nuclear explosion ; CTBT ; Magnitude ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Information transfer during contingency operations: Emergency air-ground communications (1981)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: Safety related problems are reported which occur as a consequence of information transfer deficiencies that arise when air/ground communications are (or should be) used as a resource in inflight emergency situations. The system factors, the human errors, and the associated causes of these problem are defined.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: Inform. Transfer Probl. in the Aviation System; p 73-83
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An analytic formulation for heating source memory in the thermospheric composition (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Numerical calculations from a spectral circulation model are utilized to construct an analytic Green's function formulation describing the meridional, time-dependent thermospheric composition and temperature response during magnetic storms. The purpose is to develop a formulation that embodies source memory while being sufficiently simple to serve as a heuristic guide for empirical modeling. By passing from the discrete Fourier series representation, utilized for the numerical circulation model, to a continuous Fourier integral representation, explicit waves are obtained for the thermospheric response times. The response times are altitude and species dependent and can exceed two days below 200 km. Thus, for certain storm scenarios, pronounced source memory signatures for the composition and temperature are predicted. Response times obtained from the formulation are shown to give a response consistent with previously published neutral composition data from AE-C for the February 1974 storm when an ap dependent heat source is employed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; May 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Semiempirical modeling of thermospheric magnetic storms (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An improved formulation for empirical modeling of magnetic storm effects in neutral thermospheric composition and temperature is utilized in a study of two disturbed periods. The formulation, which incorporates the prior history of the heat input rather than a single phase delay, is based on a Fourier integral representation of an existing theoretical model. This results in an improved representation of the detailed time variations and a better carry-over of model parameters from one storm to the other and provides a basis for theoretical interpretation.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; May 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Estimation of Kalman filter model parameters from an ensemble of tests (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A methodology for estimating initial mean and covariance parameters in a Kalman filter model from an ensemble of nonidentical tests is presented. In addition, the problem of estimating time constants and process noise levels is addressed. Practical problems such as developing and validating inertial instrument error models from laboratory test data or developing error models of individual phases of a test are generally considered.
    Keywords: ASTRODYNAMICS
    Type: NASA. Goddard Space Flight Center Fifth Ann. Flight Mech.(Estimation Theory Symp.; 29 p
    Format: application/pdf
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  • 7
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    Design considerations for a LORAN-C timing receiver in a hostile signal to noise environment (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The environment in which a LORAN-C Timing Receiver may function effectively depends to a large extent on the techniques utilized to insure that interfering signals within the pass band of the unit are neutralized. The baseline performance manually operated timing receivers is discussed and the basic design considerations and necessary parameters for an automatic unit utilizing today's technology are established. Actual performance data is presented comparing the results obtained from a present generation timing receiver against a new generation microprocessor controlled automatic acquisition receiver. The achievements possible in a wide range of signal to noise situations are demonstrated.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA. Goddard Space Flight Center Proc. of the 12th Ann. Precise Time and Time Interval Appl. and Planning Meeting; p 417-443
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    NASA TECHNICAL REPORTS
  • 8
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    5.8 X-ray Calorimeters (2008)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: X-ray calorimeter instruments for astrophysics have seen rapid development since they were invented in 1984. The prime instrument on all currently planned X-ray spectroscopic observatories is based on calorimeter technology. This relatively simple detection concept that senses the energy of an incident photon by measuring the temperature rise of an absorber material at very low temperatures, can form the basis of a very high performance, non-dispersive spectrometer. State-of-the-art calorimeter instruments have resolving powers of over 3000, large simultaneous band-passes, and near unit efficiency. This coupled with the intrinsic imaging capability of a pixilated x-ray calorimeter array, allows true spectral-spatial instruments to be constructed. In this chapter I briefly review the detection scheme, the state-of-the-art in X-ray calorimeter instruments and the future outlook for this technology.
    Keywords: Spacecraft Instrumentation and Astrionics
    Format: application/pdf
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  • 9
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    Close-packed Arrays of Transition-edge X-ray Microcalorimeters with High Spectral Resolution at 5.9 keV (2007)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: We present measurements of high fill-factor arrays of superconducting transition-edge x-ray microcalorimeters designed to provide rapid thermalization of the x-ray energy. We designed an x-ray absorber that is cantilevered over the sensitive part of the thermometer itself, making contact only at normal metal-features. With absorbers made of electroplated gold, we have demonstrated an energy resolution between 2.4 and 3.1 eV at 5.9 keV on 13 separate pixels. We have determined the thermal and electrical parameters of the devices throughout the superconducting transition, and, using these parameters, have modeled all aspects of the detector performance.
    Keywords: Instrumentation and Photography
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    The QBO as Potential Amplifier and Conduit to Lower Altitudes of Solar Cycle Influence (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: The solar cycle (SC) effect in the lower atmosphere has been linked observationally to the Quasi-biennial Oscillation (QBO), which is generated primarily by small-scale gravity waves. Salby and Callaghan analyzed the QBO observations covering more than 40 years and found that it contains a relatively large SC signature at 20 km. Following up on a 2D study with our Numerical Spectral Model (NSM), we discuss here a 3D study in which we simulated the QBO under the influence of the SC. For a SC period of 10 years, the amplitude of the relative variations of radiative forcing is taken to vary from 0.2% at the surface to 2% at 50 km to 20% at 100 km and above. This model produces in the lower stratosphere a relatively large modulation of the QBO, which appears to be related to the SC and is in qualitative agreement with the observations. Further studies are needed, (1) to determine whether the effect is real and the results are robust and (2) to explore the mechanism(s) that may amplify the SC effect. Quasi-decadal oscillations, generated internally by the QBO interacting with the seasonal cycles, may interfere with or aid the SC effect.
    Keywords: Meteorology and Climatology
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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