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  • 11
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    Altitude variation of ion composition in the midlatitude trough region - Evidence for upward plasma flow (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Midday ion composition altitude variations in midlatitude trough region and plasmasphere, observing light ion concentrations
    Keywords: GEOPHYSICS
    Type: ; 1 (
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  • 12
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    Seasonal variation in the F2 region (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Seasonal variations in F 2 region, using critical frequencies during descending solar activity phase
    Keywords: GEOPHYSICS
    Type: ; YAL SOCIETY (
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  • 13
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    A polar maximum of electron concentration at 1000 km altitude (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Upper ionosphere electron concentration enhancement in polar cap from satellite probe measurements
    Keywords: GEOPHYSICS
    Type: ; YAL SOCIETY (
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  • 14
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    Temporal variations of thermospheric hydrogen derived from in situ measurements (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Thermospheric atomic hydrogen concentration temporal variations in situ measurement by Explorer 32 satellite
    Keywords: GEOPHYSICS
    Type: ; 367-414. (
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  • 15
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    Response of the thermospheric density to auroral heating during geomagnetic disturbances (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Thermospheric density response to auroral heating during geomagnetic disturbances simulation assuming impulse heat input into small latitude band within auroral ovals
    Keywords: GEOPHYSICS
    Type: ; 1 (
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  • 16
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    A theory of the diurnal variations of the thermosphere (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Thermosphere diurnal variations two dimensional model atmosphere characteristic waves, separating density and temperature variations
    Keywords: GEOPHYSICS
    Type: ; YSICA STATUS SOLIDI
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  • 17
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    The dynamo of the diurnal tide and its effect on the thermospheric circulation (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A theoretical multiconstituent model (including O, N2, and O2) which describes the interactions between neutral winds, dynamo electric fields, and ion drifts is used to interpret observations that revealed a dominance of the fundamental diurnal tide in the upper thermosphere and at equatorial latitudes, and its effect on the thermospheric circulation. The model is shown to reproduce reasonably well the magnitudes of the neutral winds, ion drift velocities, and the ratio between the two. A solution for the neutral winds in which the dynamo electric field is forced to zero shows that the dynamo-induced ion drift is very important in accelerating the neutral atmosphere at higher altitudes. The dynamo interaction primarily affects the curl component of the field; its effect on the temperature and density perturbations is small.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science (ISSN 0032-0633); 38; 301-309
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  • 18
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    Semiannual variations in the neutral composition. (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Meteor trail observations of the meridional mesospheric wind field are analyzed in terms of spherical harmonics, showing a predominance in the P3 term for the semiannual component. This suggests two heat sources for the semiannual variations. One that peaks at the equator is associated with the semiannual migration of the sun between the two hemispheres. A second heat input of greater magnitude that peaks at high latitudes is presumably related to auroral heating associated with the semiannual component in the occurrence of magnetic storms. The wind circulation, consistent with these sources, is shown to cause a semiannual redistribution of the minor constituent O in the lower thermosphere with the effects of decreasing the ratios of O/N2 and O/O2 at high latitudes and of enhancing these ratios at mid to low latitudes during equinox.
    Keywords: GEOPHYSICS
    Type: Annales de Geophysique; 27; Oct
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  • 19
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    Tidal waves within the thermosphere (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The eigenfunctions of the atmosphere (the Hough functions within the lower atmosphere below about 100 km) change their structure and their propagation characteristics within the thermosphere due to dissipation effects such as heat conduction, viscosity, and ion drag. Wave dissipation can be parameterized to a first-order approximation by a complex frequency, the imaginary term of which simulates an effective ion drag force. It is shown how the equivalent depth, the attenuation, and the vertical wavelength of the predominant symmetric diurnal tidal modes change with height as functions of effective ion drag. The boundary conditions of tidal waves are discussed, and asymptotic solutions for the wave parameters like pressure, density, temperature, and wind generated by a heat input proportional to the mean pressure are given. Finally, diffusion effects upon the minor constituents within the thermosphere are described.
    Keywords: GEOPHYSICS
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  • 20
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    Theory of the phase anomaly in the thermosphere (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Discussion of the temperature-density phase anomaly on the basis of a quasi-three-dimensional model in which the thermosphere dynamics associated with wind circulation is considered in a self-consistent form. Included in this analysis are the first three harmonics, which involve nonlinear coupling between diurnal and semidiurnal tides. It is shown that the phase anomaly with exospheric temperature peaks near 1600 LT and mass density peaks between 1400 and 1445 LT can be reproduced in a self-consistent theory without invoking ad hoc assumptions and boundary conditions that would mask the physical processes to be explored. A number of factors and processes are found to contribute to the phase anomaly, including the semidiurnal and particularly the terdiurnal components, heat advection, diffusion, and energy coupling with the lower atmosphere.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 78; Nov. 1
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