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  • Analytical Chemistry and Spectroscopy  (120)
  • GEOPHYSICS  (80)
  • 1
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    Parametric wave amplification and mixing in the ionosphere (1970)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Ionospheric parametric amplification and frequency mixing due to polarized TEM waves nonlinear interaction with longitudinal electrostatic waves
    Schlagwort(e): GEOPHYSICS
    Materialart: ; TROPHYSICAL JOURNAL
    Format: text
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  • 2
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    Delta function excitation of waves in the earth's ionosphere (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Excitation of the earth's ionosphere by delta function current sheets is considered, and the temporal and spatial evolution of wave packets is analyzed for a two-component collisional F2 layer. Approximations of an inverse Fourier-Laplace transform via saddle point methods provide plots of typical wave packets. These illustrate cold plasma wave theory and may be used as a diagnostic tool since it is possible to relate specific features, e.g., the frequency of a modulation envelope, to plasma parameters such as the electron cyclotron frequency. It is also possible to deduce the propagation path length and orientation of a remote radio beacon.
    Schlagwort(e): GEOPHYSICS
    Materialart: Radio Science (ISSN 0048-6604); 18; 1337-135
    Format: text
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  • 3
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    On the interpretation of ionospheric resonances stimulated by Alouette 1. (1967)
    In:  Other Sources
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    Publikationsdatum: 2011-08-11
    Beschreibung: Plasma ringing phenomena stimulated by Alouette I and other ionospheric probes at upper hybrid frequency and cyclotron frequency harmonics in near zero group velocity regions
    Schlagwort(e): GEOPHYSICS
    Materialart: JOURNAL OF GEOPHYSICAL RESEARCH
    Format: text
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  • 4
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    Dependence of field-aligned electron precipitation occurrence on season and altitude (1974)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: An examination of factors affecting the occurrence of field-aligned 2.3-keV electron precipitation has been performed by using data from more than 7500 orbits of the polar-orbiting satellite Ogo 4. Both season and altitude were found to be parameters that are directly related to the probability of occurrence. The highest probabilities occurred when the measurements were made at altitudes from 800 km to apogee (914 km), except during summer. In this altitude interval, the electron precipitation was more likely to be field-aligned during winter than during any other season. The analysis suggests the establishment by electrostatic charge layers of localized electric fields parallel to the magnetic field. The resulting potential distribution focuses the electron beam along the field lines in the region between the charge layers but destroys the focused beam below the lower layer, and thus an altitude dependence is created.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 79; Sept. 1
    Format: text
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  • 5
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    Topside optical view of the dayside cleft aurora (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: Photometers on the ISIS-II spacecraft provide a view of the atomic oxygen 5577-A and 6300-A emissions and the N2(+) 3914-A emission detected as dayside aurora in the magnetospheric cleft region. The 6300-A emission forms a continuous and permanent band across the noon sector, at about 78 deg invariant latitude, with a defined region of maximum intensity that is never less than 2 kR (uncorrected for albedo) and is centered near magnetic noon. There are significant differences in the intensity patterns on either side of noon and their responses to geomagnetic activity. Discrete 3914-A auroral forms appear within this region at preferred locations that cannot be precisely specified but which tend to the poleward edge of the 6300-A emission in the evening and the equatorward edge in the morning, where the difference between the two emissions is greatest. It is concluded that the discrete auroras observed by all-sky cameras in the day sector follow the 6300-A emission through the cleft region, though a definite cleft boundary is not defined.
    Schlagwort(e): GEOPHYSICS
    Materialart: Planetary and Space Science; 24; Oct. 197
    Format: text
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  • 6
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    Protons as the prime contributors to storm time ring current (1975)
    In:  Other Sources
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    Publikationsdatum: 2011-08-16
    Beschreibung: Following a large sudden commencement on June 17, 1972, a large magnetic storm evolved, with a well-developed main phase and recovery phase. Explorer 45 (S3-A), with its apogee near 16 hours local time in June, measured the equatorial particle populations and magnetic field throughout this period. By use of data obtained during the symmetric recovery phase it is shown that through a series of self-consistent calculations, the measured protons, with energies from 1 to 872 keV, can account for almost all of the observed ring current magnetic effects within the limits of experimental uncertainties. This enables us to set an upper limit to the heavy ion contribution to the storm time ring current of a few percent of the proton contribution.
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research; 80; Sept. 1
    Format: text
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  • 7
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    Nonlinear interaction between whistlers. (1969)
    In:  Other Sources
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    Publikationsdatum: 2011-08-12
    Beschreibung: Whistlers nonlinear interaction during cold magnetoplasma propagation, considering energy exchanges between waves
    Schlagwort(e): GEOPHYSICS
    Materialart: ; ST. OF RADIO AND ELE
    Format: text
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  • 8
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    Ionospheric wave measurements with satellite-borne cross-power spectrum analyzers (1980)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The paper studies the feasibility of using the cross-power spectrum analyzer on a satellite such as the Space Shuttle to measure the spectrum of potential and charged particle density fluctuations and macroscopic parameters in the ionosphere. The integration time required to make a measurement of a cross-power spectral density to a given accuracy, or its equivalent, the spatial resolution of a measurement to a given accuracy is examined.
    Schlagwort(e): GEOPHYSICS
    Materialart: Radio Science; 15; May-June
    Format: text
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  • 9
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    Some aspects of the relation between Pi 1-2 magnetic pulsations observed at L = 1.3-2.1 on the ground and substorm-associated magnetic field variations in the near-earth magnetotail observed by AMPTE CCE (1989)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Schlagwort(e): GEOPHYSICS
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 94; 3611-361
    Format: text
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  • 10
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    Reference model for CH4 and N2O and trends (1989)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: Data from the Stratospheric and Mesospheric Sounder on Nimbus 7 were used as the basis for a model of the abundances of nitrous oxide and methane in the stratosphere. A version of this was produced two years ago (Taylor, Dudhia, and Rodgers - hereafter called the original paper) and in this new paper some of the possible error sources and long term trends are considered in more detail. The principle source of error in the SAMS retrievals is thought to be the use of climatological ozone profiles to invert the temperature profile data. However, it was found that the effect is too small, and of the opposite sign, to explain the discrepancies between satellite and in situ measurements, noted in the original paper. As expected, no systematic trends which exceed the estimated error in the data are found in either methane or nitrous oxide.
    Schlagwort(e): GEOPHYSICS
    Materialart: International Council of Scientific Unions, Middle Atmosphere Program. Handbook for MAP. Volume 31: Reference Models of Trace Species for the COSPAR International Reference Atmosphere; p 80-84
    Format: application/pdf
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