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  • GEOPHYSICS  (1,388)
  • 1980-1984  (1,362)
  • 1960-1964  (26)
  • 1984  (768)
  • 1983  (594)
  • 1962  (26)
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  • 1980-1984  (1,362)
  • 1960-1964  (26)
Year
  • 1
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    Mathematical developments regarding the general theory of the Earth magnetism (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A literature survey on the Earth's magnetic field, citing the works of Gauss, Erman-Petersen, Quintus Icilius and Neumayer is presented. The general formulas for the representation of the potential and components of the Earth's magnetic force are presented. An analytical representation of magnetic condition of the Earth based on observations is also made.
    Keywords: GEOPHYSICS
    Type: NASA-TM-77103 , NAS 1.15:77103
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Atmospheric and ionospheric effects of precipitated energetic O(+) ions (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Results of earlier studies on the atmospheric and ionospheric effects of the precipitation of energetic (up to 0.4 ergs/sq cm per sec per sr) O(+) fluxes are summarized. It is concluded that the main effect is the transfer of the bulk of the incoming energy flux to the neutral atmosphere at F region altitudes in the form of heat, which in turn has a significant effect on global thermospheric winds and temperatures. The precipitation events produce a large backsplash of energetic neutral oxygen atoms. The flux of O2 capable of escaping from the earth is estimated to be comparable to that of hydrogen, and the portion of these O2 atoms that could be ionized is estimated to be ten times that of the incoming O(+) ions, raising the possibility that the events may be self-sustaining.
    Keywords: GEOPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Present state of knowledge of the upper atmosphere: An assessment report (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A program of research, technology, and monitoring of the phenomena of the upper atmosphere, to provide for an understanding of and to maintain the chemical and physical integrity of the Earth's upper atmosphere was developed. NASA implemented a long-range upper atmospheric science program aimed at developing an organized, solid body of knowledge of upper atmospheric processes while providing, in the near term, assessments of potential effects of human activities on the atmosphere. The effects of chlorofluorocarbon (CFC) releases on stratospheric ozone were reported. Issues relating the current understanding of ozone predictions and trends and highlights recent and future anticipated developments that will improve our understanding of the system are summarized.
    Keywords: GEOPHYSICS
    Type: NASA-TM-87559 , NAS 1.15:87559
    Format: application/pdf
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  • 4
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    Intercomparison of stratospheric/mesospheric data; Proceedings of the Topical Meeting, Graz, Austria, June 25-July 7, 1984 (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Comparative analyses of various stratospheric and mesospheric species, including aerosols, ions, ozone, and some minor species, are presented, based on measurements obtained from rocket, balloon, aircraft, and satellite missions. In addition, studies concerning temperature and density characteristics of the stratosphere and mesosphere are included, as well as discussions on the various sensing and measurement techniques. Finally, dynamics and turbulence measurements are examined; consideration is given to radar winds, solar X-ray and HF radiowave absorption, and ionization irregularities.
    Keywords: GEOPHYSICS
    Type: (ISSN 0273-1177)
    Format: text
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  • 5
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    DE-1 observations of ordinary mode and extraordinary mode auroral kilometric radiation (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Observations of auroral kilometric radiation (AKR) made with the Dynamics Explorer (DE-1) indicate the presence of both ordinary and extraordinary wave modes. Although the two modes usually occur separately, they are sometimes observed together. When both modes are present, the ordinary-mode component tends to occur at lower frequencies and with lower amplitudes than those of the accompanying extraordinary-mode component. On the other hand, the local electron gyrofrequency is an absolute lower frequency cutoff for both modes. Ordinary mode intensities are proportional to extraordinary mode intensities but less by roughly a factor of 50. Extraordinary mode ray paths are generally confined to a cone within 50 degrees of the source magnetic field direction and ordinary mode emissions are typically observed outside of this cone. This behavior suggests that both components are produced within the same source region but are then refracted differently as they escape.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 1188-119
    Format: text
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  • 6
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    Aerosol limb absorption (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A global observation was conducted of the vertical distribution of stratospheric aerosol and ozone using the absorption effect of the rays of the Sun by the stratospheric aerosol and ozone.
    Keywords: GEOPHYSICS
    Type: NASA-TM-77733 , NAS 1.15:77733
    Format: application/pdf
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  • 7
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    Fast collisionless tearing in an anisotropic neutral sheet (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The collisionless tearing mode in a neutral sheet is studied in the presence of ion temperature (Ti) anisotropy, using Vlasov description for both ions and electrons. It is found that the growth rate of the instability is significantly enhanced if the ratio of Ti perpendicular to the equilibrium magnetic field to Ti parallel to the field is greater than one. For typical magnetotail parameters with modest temperature anisotropy, it is shown that the linear e-folding time is reduced to a small fraction of the time delays believed to precede the onset of reconnection. This enhancement of the growth rate is due to the Lorentz force acting on the ions that cross the neutral plane, traversing beyond the conventional electron-tearing layer.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 12-15
    Format: text
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  • 8
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    Discussion of the design of satellite-laser measurement stations in the eastern Mediterranean under the geological aspect. Contribution to the earthquake prediction research by the Wegener Group and to NASA's Crustal Dynamics Project (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Research conducted for determining the location of stations for measuring crustal dynamics and predicting earthquakes is discussed. Procedural aspects, the extraregional kinematic tendencies, and regional tectonic deformation mechanisms are described.
    Keywords: GEOPHYSICS
    Type: NASA-TM-77412 , NAS 1.15:77412
    Format: application/pdf
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  • 9
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    The elements of the Earth's magnetism and their secular changes between 1550 and 1915 (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The results of an investigation about the magnetic agents outside the Earth's surface as well as the Earth's magnetic elements for the epochs 1550, 1900, 1915 are presented. The secular changes of the Earth's magnetic elements during the time interval 1550 - 1900 are also included.
    Keywords: GEOPHYSICS
    Type: NASA-TM-77343 , NAS 1.15:77343
    Format: application/pdf
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  • 10
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    Testing the authenticity of moldavite by electron microscopy (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Non-destructive testing of moldavites for authenticity by electron microscopy on the basis of morphology and structure is described.
    Keywords: GEOPHYSICS
    Type: NASA-TM-77335 , NAS 1.15:77335
    Format: application/pdf
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