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  • 1
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    Dependence of the High Latitude Middle Atmosphere Ionization on Structures in Interplanetary Space (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The precipitation of high energetic electrons during and after strong geomagnetic storms into heights below 100 km in middle and subauroral latitudes is markedly modulated by the structure of the interplanetary magnetic field (IMF). Under relative quiet conditions the D-region ionization caused by high energetic particle precipitation (energies greater than 20 to 50 keV) depends on changes of the interplanetary magnetic field and also on the velocity of the solar wind. To test this assumption, the influence of the IMF-sector boundary crossings on ionospheric absorption data of high and middle latitudes by the superposed-epoch method was investigated.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 10; p 200-204
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    High Energy Particle Effects in the D Region During and After Geomagnetic Storms (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The precipitation of energetic particles from the magnetosphere produces a remarkable modification of the mid-latitude D-region structure during daytime and at dawn and dusk conditions. Beside the heavily fluctuating precipitation during the main storm phase, there exists a more continuous input of high energy electrons into the mesosphere in the belt between phi= 50 deg and the auroral zone up to ten days after the disturbance. The excessive D-region ionization, the after-effect of geomagnetic storms, is caused at least partly by additional nitric oxide production. The winter anomaly effects are especially amplified and prolonged by this effect. The source of this mid-latitude particle precipitation is thought to be situated in magnetospheric slot region processes.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 10; p 192
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Spring Changeover of the Middle Atmosphere Circulation Compared with Rocket Wind Data up to 80 Km (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The middle atmosphere circulation is governed by two seasonal basic states in winter and summer, twice a year separated by relatively shortlived reversal periods. These seasonal basic states of circulation and the spring changeover period between them are investigated.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 10; p 86-90
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Seasonal Characteristics of Mesospheric Plasma and Their Transitions (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The main seasonal features of the middle atmosphere are arising from the different dynamical basic states in winter and summer. The development of the two controversial circulation systems and the also different peculiarities of transition between them in spring and autumn create the completely dominant seasonal variations in strato- and mesosphere. Even in the plasma structures of the mesospheric D-region the seasonal variation is towering above the amplitudes of extraterrestrial influences. From standard ionospheric sounding, significant seasonal D- and E-region effects, adhering to equally significant structure changes in the neutral gas in the height region from 20 to 100 km were discovered. Results about such typical seasonal features are summarized.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 10; p 75-78
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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