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  • Other Sources  (7)
  • 1990-1994  (7)
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  • 1
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    Poynting vector measurements of electromagnetic ion cyclotron waves in the plasmasphere (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Results are presented from an analysis of the June 6, 1985 Pc 2 measurements for which E, B, and delta-N were all analyzed. The event occurred in the duskside overlap region between the plasmaspheric bulge and the ion ring current. Results of the Poynting vector analysis of the R and L mode components show both of them to be characterized by northward Poynting vector, indicating energy flux away from the equator. The value of the Poynting vector was found to be about 3 microW/sq m.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; A9 S; 13
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  • 2
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    On quasi-thermal fluctuations near the plasma frequency in the outer plasmasphere: A case study (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: We present a derivation of the quasi-thermal electrostatic fluctuation power spectrum in a mult-Maxwellian plasma and show sample calculated spectra. We then apply this theory, which has been successfully applied in oter regions of space, to spectra from two Active Magnetospheric Particle Tracer Explorer/Ion Release Module (AMPTER IRM) passes through the duskside plasmasphere. WE show that the plasma line that is often seen in this region is usually quasi-thermal in origin. We obtain a refined estimate of the plasma frequency and infer a cold electron temperature which is consistent within a factor of 2 with both models and previous meausurements by other techniques, but closer investigation reveals that details of the plasma line cannot be explained with the ususal two isotropic Maxwellian model.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 99; A12; p. 23,651-23,660
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  • 3
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    Plasma diffusion at the magnetopause - The case of lower hybrid drift waves (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The diffusion expected from the quasi-linear theory of the lower hybrid drift instability at the earth's magnetopause is recalculated. The resulting diffusion coefficient is marginally large enough to explain the thickness of the boundary layer under quiet conditions, based on observational upper limits for the wave intensities. Thus, one possible model for the boundary layer could involve equilibrium between the diffusion arising from lower hybrid waves and various loss processes.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 96; 16
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  • 4
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    The interaction of impulsive solar wind discontinuities with the magnetosphere - A multi-satellite case study (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Data collected on September 4-5, 1984 by the outbound AMPTE/IRM spacecraft which stayed just outside the expanding earth's bow shock for 7.5h are examined. The data are gathered during an unusual period for which the solar wind pressure and magnetic field are relatively constant except for two discontinuities with associated approximately equal to 1 min duration pressure pulses. The observations indicate that the bow shock reacts rapidly to solar wind dynamic pressure variations; that both discontinuity/pressure pulse events were followed more or less immediately by a decrease in the geosynchronous particle fluxes, indicating the growth phase of a substorm and possibly also the shadowing of energetic ions by the compressed magnetopause followed after 10-30 min by a sudden enhancement in the energetic particles which began on the nightside and drifted to the dayside; and sudden impulse ground signatures are observed which seem to depend critically on the IMF orientation as well as on the longitude and latitude of the particular ground stations.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science (ISSN 0032-0633); 38; 841-850
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  • 5
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    Bispectral analysis of equatorial spread F density irregularities (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Bispectral analysis has been applied to density irregularities at frequencies 5-30 Hz observed with a sounding rocket launched from Peru in March 1983. Unlike the power spectrum, the bispectrum contains statistical information about the phase relations between the Fourier components which make up the waveform. In the case of spread F data from 475 km the 5-30 Hz portion of the spectrum displays overall enhanced bicoherence relative to that of the background instrumental noise and to that expected due to statistical considerations, implying that the observed f exp -2.5 power law spectrum has a significant non-Gaussian component. This is consistent with previous qualitative analyses. The bicoherence has also been calculated for simulated equatorial spread F density irregularities in approximately the same wavelength regime, and the resulting bispectrum has some features in common with that of the rocket data. The implications of this analysis for equatorial spread F are discussed, and some future investigations are suggested.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; A6 J
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  • 6
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    The plasma wave signature of a 'magnetic hole' in the vicinity of the magnetopause (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Wave spectral measurements in the region of the September 4, 1984 magnetic hole obtained with the plasma wave instrumentation aboard the AMPTE IRM spacecraft are presented. The instrument is briefly described. The full wave data is given and possible reasons for the typical form of the spectra inside the hole are discussed. Relevant observations are presented and different wave modes and their possible origins are discussed. A summary is given with a discussion of ideas about the origin and formation of holes.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 19099-19
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  • 7
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    Plasma diffusion at the magnetopause? The case of lower hybrid drift waves (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The diffusion expected from the quasilinear theory of the lower hybrid drift instability at the Earth's magnetopause is recalculated. The resulting diffusion coefficient is in principle just marginally large enough to explain the thickness of the boundary layer under quiet conditions, based on observational upper limits for the wave intensities. Thus, one possible model for the boundary layer could involve equilibrium between the diffusion arising from lower hybrid waves and various low processes. However, some recent data and simulations seems to indicate that the magnetopause is not consistent with such a soft diffusive equilibrium model. Furthermore, investigation of the nonlinear equations for the lower hybrid waves for magnetopause parameters indicates that the quasilinear state may never arise because coalescence to large wavelengths, followed by collapse once a critical wavelengths is reached, occur on a time scale faster than the quasilinear diffusion. In this case, an inhomogeneous boundary layer is to be expected. More simulations are required over longer time periods to explore whether this nonlinear evolution really takes place at the magnetopause.
    Keywords: PLASMA PHYSICS
    Type: NASA-CR-188913 , NAS 1.26:188913 , MPE-PREPRINT-196 , (ISSN 0178-0719)
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