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  • 1980-1984  (8)
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  • 1
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    Modification of the ionosphere by large space vehicles (1982)
    Elsevier
    Details
    Publication Date: 1982-01-01
    Print ISSN: 0273-1177
    Electronic ISSN: 1879-1948
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Incoherent scatter observations of an artificially modified ionosphere (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The 'experiment of opportunity' to test incoherent scatter radar techniques for the diagnostic study of a chemically induced modification of the ionosphere occasioned by the launch of the HEAO-C satellite is described. The optimal utilization of a steerable incoherent scatter radar for a short duration event is examined. The choice of keeping the antenna fixed to obtain good control data and excellent time resolution along a given direction versus scanning the antenna to obtain mixed spatial and temporal morphologies is discussed. Results for fixed position measurements, elevation scans, ion-drift, and total electron content are presented. The first unambiguous observations of a gas expansion 'snowplow effect' is reported along with the derivation of local and height-integrated plasma recombination rates and the full spatial, temporal, and dynamical morphologies of a large-scale ionospheric hole.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 203-215
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Periodicities in the occurrence of aurora as indicators of solar variability (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A compilation of records of the aurora observed in China from the Time of the Legends (2000 - 3000 B.C.) to the mid-18th century has been used to infer the frequencies and strengths of solar activity prior to modern times. A merging of this analysis with auroral and solar activity patterns during the last 200 years provides basically continuous information about solar activity during the last 2000 years. The results show periodicities in solar activity that contain average components with a long period (approx. 412 years), three middle periods (approx. 38 years, approx. 77 years, and approx. 130 years), and the well known short period (approx. 11 years).
    Keywords: SOLAR PHYSICS
    Type: JPL Solar Wind Five; p 349-352
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The effect of rocket launches on the ionosphere (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A summary is provided of the known theoretical and observational aspects of 'inadvertent' rocket-exhaust effects upon the ionosphere. The atmospheric regions susceptible to rocket exhaust effects are examined. The major perturbations occur in those regions where the sun's radiation causes partial ionization to occur. These regions include the D, E, F1, and F2 regions of the ionosphere. It is found that the dominant cause of atmospheric perturbations due to rocket exhaust rests in the variety of chemical reactions that can occur between the exhaust material (usually molecular species, e.g., H2O, H2, CO2) and the neutral and ionized components of the atmosphere. The observational evidence for artificially-induced ionospheric modifications is discussed and a description is presented of physical processes responsible for ionospheric holes. Attention is given to scientific and technological interest in artificially-created ionospheric holes, and to the large-scale, artificially-induced depletion of the earth's ionosphere which could be monitored in connection with the launch of NASA's third High Energy Astrophysical Observatory.
    Keywords: GEOPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Optical signature of an ionospheric hole (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Simultaneous radio and optical diagnostics of a large, artificially-induced ionospheric modification were conducted during the June 1981 launch of a weather satellite. Intensified imaging and photometer observations at 6300 A, along the same ray path as VHF polarimeter measurements of the ionosphere's total electron content (TEC), were made while the rocket plume caused disturbances. A rapid TEC chemical depletion, on the order of -16.8 x 10 to the 12th el/sq cm, caused a burst of 6300 A radiation which expanded over 60 deg of the sky, with a peak intensity of almost 9 k R. Atmospheric diffusion and O(1D) quenching rate theoretical estimates were then tested, using the event as an active space plasma experiment.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 9; Mar. 198
    Format: text
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  • 6
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    A summary of rocket-induced ionospheric perturbations (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Observational evidence for artificially induced ionospheric modifications is briefly reviewed and the scientific and technological interest in induced ionospheric holes is discussed.
    Keywords: GEOPHYSICS
    Type: AGARD The Phys. Basis of the Ionosphere in the Solar-Terrest. System; 9 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Influence of solar sector boundaries on ionospheric variability (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A search for solar sector boundary related perturbations upon the ionospheric F region has been conducted by using a 3-year data base of ionospheric total electron content (TEC) observations from low to auroral latitudes. It has been found that as the earth passes from one sector to another, the daytime TEC from middle to high latitudes (L = 3-5) generally undergoes a change from relatively enhanced to relatively depleted TEC values. The opposite trend occurs at low latitudes (L = 2). The TEC variations are small in comparison with the overall F region variability and appear to be associated with the increased geomagnetic activity levels that occur when the earth enters into a new sector.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; 9145-915
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Theory and observation of a dynamically evolving negative ion plasma (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The study described here examines the full range of negative-ion chemistry in the upper ionosphere by using current reaction rate data to investigate the many chemical paths SF6-type injections might take in an F region environment. Special attention is given to the conditions required to create heavy negative ions that persist long enough to affect the dynamical properties of the F region. The ambipolar diffusion characteristics of a three-component plasma are described, and estimates are given of the incoherent scatter spectra obtained from such a plasma. Model calculations using a first-order chemical code are defined and tested in order to investigate the actual types of negative-ion plasma capable of being created under nighttime conditions.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 87; Oct. 1
    Format: text
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