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  • Other Sources  (14)
  • 1980-1984  (7)
  • 1970-1974  (7)
  • 1955-1959
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  • 1
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    Numerical studies of the deposition of material released from fixed and rotary wing aircraft (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The computer code AGDISP (AGricultural DISPersal) has been developed to predict the deposition of material released from fixed and rotary wing aircraft in a single-pass, computationally efficient manner. The formulation of the code is novel in that the mean particle trajectory and the variance about the mean resulting from turbulent fluid fluctuations are simultaneously predicted. The code presently includes the capability of assessing the influence of neutral atmospheric conditions, inviscid wake vortices, particle evaporation, plant canopy and terrain on the deposition pattern. In this report, the equations governing the motion of aerially released particles are developed, including a description of the evaporation model used. A series of case studies, using AGDISP, are included.
    Keywords: AERODYNAMICS
    Type: NAS 1.26:3779 , NASA-CR-3779
    Format: application/pdf
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  • 2
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    Computer program for prediction of the deposition of material released from fixed and rotary wing aircraft (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This is a user manual for the computer code ""AGDISP'' (AGricultural DISPersal) which has been developed to predict the deposition of material released from fixed and rotary wing aircraft in a single-pass, computationally efficient manner. The formulation of the code is novel in that the mean particle trajectory and the variance about the mean resulting from turbulent fluid fluctuations are simultaneously predicted. The code presently includes the capability of assessing the influence of neutral atmospheric conditions, inviscid wake vortices, particle evaporation, plant canopy and terrain on the deposition pattern.
    Keywords: AERODYNAMICS
    Type: NASA-CR-3780 , NAS 1.26:3780
    Format: application/pdf
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  • 3
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    Computing aerodynamic sound using advanced statistical turbulence theories (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: It is noted that the calculation of turbulence-generated aerodynamic sound requires knowledge of the spatial and temporal variation of Q sub ij (xi sub k, tau), the two-point, two-time turbulent velocity correlations. A technique is presented to obtain an approximate form of these correlations based on closure of the Reynolds stress equations by modeling of higher order terms. The governing equations for Q sub ij are first developed for a general flow. The case of homogeneous, stationary turbulence in a unidirectional constant shear mean flow is then assumed. The required closure form for Q sub ij is selected which is capable of qualitatively reproducing experimentally observed behavior. This form contains separation time dependent scale factors as parameters and depends explicitly on spatial separation. The approximate forms of Q sub ij are used in the differential equations and integral moments are taken over the spatial domain. The velocity correlations are used in the Lighthill theory of aerodynamic sound by assuming normal joint probability.
    Keywords: ACOUSTICS
    Type: NASA-CR-165697
    Format: application/pdf
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  • 4
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    The distribution of maximum temperatures of coronal active region loops (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The emission measure distribution across the range 4.5 log T 6.5 was derived for several coronal active regions by combining EUV line fluxes with broadband X-ray fluxes. The distributions of the maximum temperature was then derived using a numerical model. It is shown that the emission measure distribution can be represented over the full range 5.6 log Tm 6.5 by the superposition of simple loop models, if the models incorporate a substantial rise in their individual emission measure distributions near the maximum temperature. The unresolved loops may have substantial area ratios, since it is this ratio that fixes the extent of the rise in the emission measure distribution. Since the bulk of the emission measure is then contributed from the loop tops, the distribution of maximum temperatures has approximately the same shape as does the integrated emission measure distributions. The EUV and X-ray data used were obtained by from two separate experiments on ATM/Skylab.
    Keywords: SOLAR PHYSICS
    Type: NASA-CR-161527 , ATR-80(7813)-1
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  • 5
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    The distribution of maximum temperatures of coronal active region loops (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Starting with the integrated emission measure distributions of solar active regions, the distribution of the maximum temperature parameter which characterizes individual plasma loops is determined. The observed emission measure distributions were determined by combining EUV and X-ray data from two separate experiments on ATM/Skylab. The present work sets some limits on such an approach. It is found that the distribution of maximum temperature has approximately the same shape as the integrated emission measure distributions, a result which is expected since most of the loop emission measure is near their maximum temperatures.
    Keywords: SOLAR PHYSICS
    Type: Astronomy and Astrophysics; 93; 1-2,; Jan. 198
    Format: text
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  • 6
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    Analysis of solar X-ray data (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Type III solar bursts occurring in the absence of solar flares were observed to be accompanied by weak X-radiation. The energy scale of an OSO-3 soft X-ray ion chamber was assessed using realistic theoretical X-ray spectra. Relationships between soft solar X-rays and solar activity were investigated. These included optical studies, the role of the Type III acceleration mechanism in establishing the soft X-ray source volume, H alpha flare intensity variations, and gross magnetic field structure.
    Keywords: SPACE RADIATION
    Type: NASA-CR-125600 , REPT-034590-1-F
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  • 7
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    Observations of the infrared triplet of singly ionized calcium (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Solar IR triplet of singly ionized Ca, suggesting limb darkening caused by chromospheric inhomogeneities for source function inequality
    Keywords: SPACE SCIENCES
    Type: ; ACE(
    Format: text
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  • 8
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    Solar soft X-rays and solar activity. II - Observational assessment of the role of the type III acceleration mechanism in establishment of the soft X-ray source volume. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE RADIATION
    Type: Solar Physics; 24; June 197
    Format: text
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  • 9
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    Type III solar radio bursts accompanied by soft X-radiation in the absence of H alpha flares (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Type 3 solar radio bursts in absence of H alpha flares, noting soft X-ray emission
    Keywords: SPACE RADIATION
    Type: ; TROPHYSICAL JOURNAL
    Format: text
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  • 10
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    Solar soft X-rays and solar activity. II (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Soft X ray bursts involving solar flares from satellite observations, discussing thermal nature and total activity related H-alpha emission rates
    Keywords: SPACE RADIATION
    Type: ; YAL SOCIETY (
    Format: text
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