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  • Other Sources  (38)
  • 1
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    Partial reflection experiment (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Increasing pulse repetition rate of transmitter to meet system gain requirements for partial ionospheric reflection sounder
    Keywords: GEOPHYSICS
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  • 2
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    VLF studies (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Very low frequency experiment and theory, and full-wave solutions of coupled wave equations
    Keywords: GEOPHYSICS
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  • 3
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    Electron loss coefficients for the D-region of the ionosphere from rocket measurements during the eclipses of March 1970 and November 1966. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Observation that recombination-like electron loss coefficients measured during the March 1970 eclipse coincide with those from the November 1966 eclipse and range from 2 x 10 to the minus 7th power cu cm/sec at Z sub zero + 6 km to 0.00005 cu cm/sec at Z sub zero -2 km, where Z sub zero is the altitude of the steep gradient of electron concentration. During totality, Z sub zero was 82.5 km in 1970, and 86.8 km in 1966. For full-sun conditions, Z sub zero was 84 km on both eclipse days. Attachment-like electron loss coefficients from both eclipses are in good agreement below Z sub zero, and have a nearly constant value of about 0.008 per sec. Below Z sub zero, attachment-like loss rates agree with production rates - i.e., electron concentration is proportional to electron production.
    Keywords: GEOPHYSICS
    Type: Journal of Atmospheric and Terrestrial Physics; 34; Apr. 197
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  • 4
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    Daytime lidar measurements of tidal winds in the mesospheric sodium layer at Urbana, Illinois (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: For more than 15 years lidar systems have been used to study the chemistry and dynamics of the mesospheric sodium layer. Because the layer is an excellent tracer of atmospheric wave motions, sodium lidar has proven to be particularly useful for studying the influence of gravity waves and tides on mesospheric dynamics. These waves, which originate in the troposphere and stratosphere, propagate through the mesosphere and dissipate their energy near the mesopause making important contributions to the momentum and turbulence budget in this region of the atmosphere. Recently, the sodium lidar was modified for daytime operation so that wave phenomena and chemical effects could be monitored throughout the complete diurnal cycle. The results of continuous 24 hour lidar observations of the sodium layer structure are presented alond with measurement of the semidiurnal tidal winds.
    Keywords: GEOPHYSICS
    Type: NASA. Langley Research Center 13th International Laser Radar Conference; 4 p
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  • 5
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    Dynamics of the nighttime sodium layer over Urbana, Illinois (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Keywords: GEOPHYSICS
    Type: Middle Atmosphere Program. Handbook for MAP. Volume 2: (NASA-CR-175509); p 462-467
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  • 6
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    Middle Atmosphere Program. Handbook for MAP, volume 11 (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An overview is presented of the research activities and objectives of the middle atmosphere program (MAP). Status reports are presented of projects underway in the area of middle atmosphere climatology and atmospheric chemistry condensed minutes of MAP steering committee meetings are contained in this volume. Research recommendations for increased U.S. participation in the middle atmosphere program are given.
    Keywords: GEOPHYSICS
    Type: NASA-CR-176107 , NAS 1.26:176107
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  • 7
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    Design and implementation of a preprocessing system for a sodium lidar (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A preprocessing system, designed and constructed for use with the University of Illinois sodium lidar system, was developed to increase the altitude resolution and range of the lidar system and also to decrease the processing burden of the main lidar computer. The preprocessing system hardware and the software required to implement the system are described. Some preliminary results of an airborne sodium lidar experiment conducted with the preprocessing system installed in the sodium lidar are presented.
    Keywords: LASERS AND MASERS
    Type: NASA-CR-174595 , NAS 1.26:174595 , AR-112 , (ISSN 0568-0581)
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  • 8
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    Lidar observations of the Mount St. Helens dust layers over Urbana, Illinois (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: GEOPHYSICS
    Type: Applied Optics; 19; Sept. 15
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  • 9
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    Calibration of the Urbana lidar system (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method for calibrating data obtained by the Urban sodium lidar system is presented. First, an expression relating the number of photocounts originating from a specific altitude range to the soodium concentration is developed. This relation is then simplified by normalizing the sodium photocounts with photocounts originating from the Rayleigh region of the atmosphere. To evaluate the calibration expression, the laser linewidth must be known. Therefore, a method for measuring the laser linewidth using a Fabry-Perot interferometer is given. The laser linewidth was found to be 6 + or - 2.5 pm. Problems due to photomultiplier tube overloading are discussed. Finally, calibrated data is presented. The sodium column abundance exhibits something close to a sinusoidal variation throughout the year with the winter months showing an enhancement of a factor of 5 to 7 over the summer months.
    Keywords: LASERS AND MASERS
    Type: NASA-CR-164828 , UILU-ENG-80-2503 , AERONOMY-94 , (ISSN 0568-0581)
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  • 10
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    An investigation of the solar zenith angle variation of D-region ionization (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Model calculations are carried out with a view to interpreting the solar zenith angle variation of D-region ionization. A model is developed for the neutral chemistry including the transport terms relating to molecular and eddy diffusion. The diurnal behavior is described of the minor neutral constituents formed in an oxygen-hydrogen-nitrogen atmosphere, in the height interval between 30 and 120 km. Computations carried out for two cases of the eddy diffusion coefficients models indicate that the constituents which are important for the D-region positive-ion chemistry do not show a significant variation with zenith angle for values up to 75 deg over the D-region heights. In the ion chemistry model, ion-pair production rates are calculated for solar X-rays between 1 A and 100 A, EUV radiations from 100 A up to the Lyman-alpha line, precipitating electrons, and galactic cosmic rays. The solar zenith angle variation of the positive-ion composition, negative-ion composition, and the electron densities are described up to 75 deg zenith angle, in the height interval between 60 and 100 km.
    Keywords: GEOPHYSICS
    Type: NASA-CR-143217 , AERONOMY-67 , UILU-ENG-75-2504 , (ISSN 0568-0581)
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