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  • Other Sources  (20)
  • GEOPHYSICS  (9)
  • FLUID MECHANICS  (6)
  • ASTROPHYSICS  (3)
  • AUXILIARY SYSTEMS
  • Life and Medical Sciences
  • 1995-1999  (3)
  • 1970-1974  (17)
  • 1930-1934
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  • 1
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    A description of the solar wind-magnetosphere coupling based on nonlinear filters (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A nonlinear filtering method is introduced for the study of the solar wind -- magnetosphere coupling and related to earlier linear techniques. The filters are derived from the magnetospheric state, a representation of the magnetospheric conditions in terms of a few global variables, here the auroral electrojet indices. The filters also couple to the input, a representation of the solar wind variables, here the rectified electric field. Filter-based iterative prediction of the indices has been obtained for up to 20 hours. The prediction is stable with respect to perturbations in the initial magnetospheric state; these decrease exponentially at the rate of 30/min. The performance of the method is examined for a wide range of parameters and is superior to that of other linear and nonlinear techniques. In the magnetospheric state representation the coupling is modeled as a small number of nonlinear equations under a time-dependent input.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 100; A3; p. 3495-3512
    Format: text
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  • 2
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    Experimental measurements of diffusion coefficients for atomic oxygen (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Catalytic surface recombination for measuring diffusion coefficients of atomic oxygen
    Keywords: FLUID MECHANICS
    Type: ET. AND THERMODYN. IN HIGH TEMP. GASES 1970; P 63-74
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  • 3
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    Some results of a short-arc, orbit- determination study related to the GEOS-C altimeter experiment (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Error sources in GEOS-C satellite short arc orbit determination method as determined by altimeter experiment
    Keywords: GEOPHYSICS
    Type: PROC. OF THE GEOS-2 PROGRAM REV. MEETING, VOL. 4 NOV. 1970; P 183-240
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  • 4
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    The interaction of interstellar gas with stellar density wave packets (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: We have numerically studied the interaction between interstellar gas and a gravitational perturbation produced by a fluctuation in the stellar mass distribution. For a simple equation of state, shock waves develop even if the gravitational perturbation is aperiodic and transient. In a medium which can change thermal phase, shocks do not form and the gas makes a transition directly to the cold, dense phase. The cold material has an anomalous velocity imparted to it by the gravitational perturbation and it becomes an accretion front moving through the hot gas and capturing it. The accretion fronts trigger thermal phase change on a large scale and can reproduce the extent of observed cold clouds. Furthermore their high mass is favorable to gravitational instability and subsequent star formation.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics; 36; 2, No; Nov. 197
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  • 5
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    Fine-scale structure of a cold hydrogen layer (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Neutral-hydrogen absorption-line interferometer observations are reported for five continuum radio sources situated behind an extensive layer of cold interstellar H I gas. In contrast to low-spatial-resolution emission-line observations reported earlier which show the large-scale uniformity of the layer, the high-spatial-resolution absorption-line observations reveal variations in the velocity and density within the layer. The new results together with the old indicate the apparent coexistence of a large-scale mechanism for triggering the formation of cold hydrogen and an instability mechanism leading to small-scale irregularities.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 194; Dec. 1
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  • 6
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    An experimental test of the homogeneity of the interstellar medium (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Observations of nonthermal continuum radio emission at 750 MHz and hydrogen-line emission at 1420 MHz have been compared in order to test the extent to which cosmic-ray electrons, magnetic fields, and hydrogen gas coexist in the interstellar medium. If the interstellar medium is homogeneous in the sense that its constituents are mixed together and can interact, then regions of line and continuum emission should be spatially correlated. The measurements indicate that at most 28% of continuum emission in the Galaxy comes from such a homogeneous medium. The remaining nonthermal emission agrees in magnitude with the residual emission found by Berkhuijsen after subtraction of the polarized component of nonthermal emission. In addition, the data discussed here show that the major filamentary structures found in the two forms of emission rarely coincide spatially. Consequently, both the average and the exceptional structure in the medium indicate that the synchrotron-radiating magnetoplasma and the neutral hydrogen gas are not closely interacting in the present state of the medium.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 194; Dec. 1
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  • 7
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    Remote Sensing of Snow Fields from Earth Satellites (1971)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Considerable effort has gone into snow line delineation using available satellite data. Furthermore, increasing emphasis is being put on automated extraction of such information and generation of a useable product for hydrologists. Implications are clear that the impact from future satellite and sensors systems will create an increased demand for computer processing before the data can be used by the hydrologist. If the coarse-resolution, broad spectral band data available from current satellites already create a demand by hydrologists for computer processing of the data, it is obvious there will be an even greater demand for computer analysis and evaluation when the future ERTS data become available.
    Keywords: GEOPHYSICS
    Type: NASA, Washington Intern. Workshop on Earth Resources Surv. Systems, Vol. 2; p 430-440
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  • 8
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    Comparison of empirical magnetic field models and global MHD simulations: The near-tail currents (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The tail currents predicted by empirical magnetic field models and global MHD simulations are compared. It is shown that the near-Earth currents obtained from the MHD simulations are much weaker than the currents predicted by the Tsyganenko models, primarily because the ring current is not properly represented in the simulations. On the other hand, in the mid-tail and distant tail the lobe field strength predicted by the simulations is comparable to what is observed at about 50 R(sub E) distance, significantly larger than the very low lobe field values predicted by the Tsyganenko models at that distance. Ways to improve these complementary approaches to model the actual magnetospheric configuration are discussed.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 22; 6; p. 675-678
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  • 9
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    Finite element solution algorithm for incompressible fluid dynamics (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A finite element solution algorithm is established for the two-dimensional Navier-Stokes equations governing the transient motion of a viscous incompressible fluid, i.e., hydrodynamics. Dependent variable transformation renders the differential equation description uniformly elliptic. The finite element algorithm is established using the Galerkin criterion on a local basis within the Method of Weighted Residuals. It is unconstrained with respect to system linearity, computational mesh uniformity or solution domain closure regularity. The finite element matrices are established using a linear 'natural coordinate function' description. Computational solutions using the COMOC computer program illustrate the various features of the algorithm including recirculating flows.
    Keywords: FLUID MECHANICS
    Type: Symposium on Finite element methods in flow problems; Jan 07, 1974 - Jan 11, 1974; Swansea
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  • 10
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    Stream network analysis from orbital and suborbital imagery, Colorado River Basin, Texas (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Orbital SL-2 imagery (earth terrain camera S-190B), received September 5, 1973, was subjected to quantitative network analysis and compared to 7.5 minute topographic mapping (scale: 1/24,000) and U.S.D.A. conventional black and white aerial photography (scale: 1/22,200). Results can only be considered suggestive because detail on the SL-2 imagery was badly obscured by heavy cloud cover. The upper Bee Creek basin was chosen for analysis because it appeared in a relatively cloud-free portion of the orbital imagery. Drainage maps were drawn from the three sources digitized into a computer-compatible format, and analyzed by the WATER system computer program. Even at its small scale (1/172,000) and with bad haze the orbital photo showed much drainage detail. The contour-like character of the Glen Rose Formation's resistant limestone units allowed channel definition. The errors in pattern recognition can be attributed to local areas of dense vegetation and to other areas of very high albedo caused by surficial exposure of caliche. The latter effect caused particular difficulty in the determination of drainage divides.
    Keywords: GEOPHYSICS
    Type: E74-10050 , NASA-CR-135891 , QPR-2
    Format: application/pdf
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