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  • 2005-2009
  • 1995-1999
  • 1990-1994
  • 1985-1989  (9)
  • 1985  (9)
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  • 2005-2009
  • 1995-1999
  • 1990-1994
  • 1985-1989  (9)
Year
  • 1
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    Auroral zone electric fields from DE 1 and 2 at magnetic conjunctions (1985)
    American Geophysical Union
    Details
    Publication Date: 1985-08-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 2
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    Reply [to “Comment on ‘Electric field measurements at the magnetopause, 1, Observation of large convective velocities at rotational magnetopause discontinuities’ by T. L. Aggson, P. J. Gambardella, and N. C. Maynard”] (1985)
    American Geophysical Union
    Details
    Publication Date: 1985-08-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 3
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    Fine structure and dynamics of the Harang discontinuity - An event study (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Two rockets were launched simultaneously from the Andoya Rocket Range in northern Norway into and through a Harang discontinuity region during a small isolated substorm. Each was equipped with an array of instruments for monitoring ionospheric electric fields and auroral particles. Different sized rockets allowed both to traverse a range of 300 km while introducing altitude separations of up to 440 km, and separations between the feet of the magnetic field lines intersecting the payloads of up to 100 km. The data sets, coupled with multi-station ground-based observations, provide information on the structure and dynamics of the Harang discontinuity region. Two boundaries were encountered. The first electric field reversal was observed simultaneously by both payloads in a region of weak precipitation, while the second reversal was associated with an intense auroral band. Since an unambiguous interpretation of these data is not possible, two alternative scenarios are presented. In one the discontinuity becomes realigned during the flight following a decay in the activity. The second involves a triple cell convection system, possibly the result of an eddy in the flow.
    Keywords: GEOPHYSICS
    Type: Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169); 47; 693-705
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The westward thermospheric jet-stream of the evening auroral oval (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Ground-based and satellite measurements of the thermospheric wind in jet-streams during the evening auroral oval are analyzed, in order to study the geophysical mechanisms of thermospheric wind generation. Numerical simulations using a global, three-dimensional, time-dependent model of thermospheric dynamics were compared with the satellite data, and the results are discussed in detail. The wind distribution during the storm is shown in a series of color plates.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science (ISSN 0032-0633); 33; 425-443
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Structure in the DC and AC electric fields associated with the dayside cusp region (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The cusp region as seen in the AC and DC electric fields is one of intense variation. The intensity peaks within the soft particle precipitation. The only AC signal that appears to be unique to the cusp is broadband ULF-ELF magnetic noise. Other types of emissions are also found at other local times at high latitudes. The pattern of these signals, especially that of ULF-ELF broadband electrostatic noise (BEN), distinguishes the cusp region from other regions. BEN signatures are indicators of magnetosheath-like soft particle precipitation but not necessarily of open field lines. In addition, large spike-like features in the DC electric field are seen near local magnetic noon which appear to be related to the large convective electric fields that have been observed at the magnetopause. These features are not necessarily tied to convection reversals, but may appear within broader regions of zonal convective flow.
    Keywords: GEOPHYSICS
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    NASA TECHNICAL REPORTS
  • 6
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    Current carriers for the field-aligned current system (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Dynamics Explorer satellites have returned a large body of data containing high resolution magnetometer measurements and distributions of charged particles of all but thermal electrons. From these data the relations of the field aligned currents to particle precipitation structures were investigated and the charge carriers were identified. Results include the following: (1) during very quiet periods, field aligned currents exist primarily as fine structure; (2) during onset of substorms, region 1 and region 2 become clearly evident but contain significant structure; (3) as magnetic activity subsides, current regions become less distinct, and structure becomes more dominant; (4) the distribution of the upward currents derived from magnetometer data and calculated from suprathermal electron data agree remarkably well in shape but not necessarily in magnitude; (5) at all local times, 5 eV electrons seldom carry most of the upward current; (6) except for the accelerated inverted-V electrons, the dominant upward current carriers which are masured are below 500 eV and are distributed in energy; (7) dusk upward currents (region 1) are associated with the boundary plasma sheet; and (8) suprathermal electron bursts are important current carrying structures.
    Keywords: GEOPHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 5; 4, 19; 109-126
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Auroral zone electric fields from DE 1 and 2 at magnetic conjunctions (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Nearly simultaneous measurements of auroral zone electric fields are obtained by the Dynamics Explorer spacecraft at altitudes below 900 km and above 4,500 km during magnetic conjunctions. The measured electric fields are usually perpendicular to the magnetic field lines. The north-south meridional electric fields are projected to a common altitude by a mapping function which accounts for the convergence of the magnetic field lines. When plotted as a function of invariant latitude, graphs of the projected electric fields measured by both DE-1 and DE-2 show that the large-scale electric field is the same at both altitudes, as expected. Superimposed on the large-scale fields, however, are small-scale features with wavelengths less than 100 km which are larger in magnitude at the higher altitude. Fourier transforms of the electric fields show that the magnitudes depend on wavelength. Outside of the auroral zone the electric field spectrums are nearly identical. But within the auroral zone the high and low altitude electric fields have a ratio which increases with the reciprocal of the wavelength. The small-scale electric field variations are associated with field-aligned currents. These currents are measured with both a plasma instrument and magnetometer on DE-1.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 7479-749
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Comparative in situ studies of the unstable day-time equatorial E-region (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Three in situ rocket observations of electrostatic fluctuations which characterize the strong, mild, and weak day-time unstable E-region are compared. The fluctuations are analyzed in relation to the ambient electron density gradients, the measured or inferred drift velocities and, where possible, to simultaneous VHF backscatter radar measurements. Based on these parameters, the linear dispersion relation is solved to find the range of altitudes and wavenumbers for which the growth rate indicates that instability will occur. These computations are compared with actual observations of the irregularities. How well the linear growth rate predicts the altitude range of the unstable layer, and to what extent the regime of the unstable wavenumbers is reflected in the spectra of the irregularities, is shown. Overall, the agreement is good.
    Keywords: GEOPHYSICS
    Type: Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169); 47; 791-811
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    A diurnal study of the electrical structure of the equatorial middle atmosphere (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Electrical parameters measured from 115 km down to below 20 km during the Project Condor campaign at the Punta Lobos Rocket Range near Lima, Peru, are presented. Ten rocket-launched payloads measured electrical conductivity. A strong diurnal influence due to solar ultraviolet radiation is shown. Nine of the payloads also measured electric fields. No large mesospheric vertical electric fields are found in the data. A calculation of the dc global conduction current density at 18 km is smaller than previously measured at low latitudes and does not show the conventional diurnal variation.
    Keywords: GEOPHYSICS
    Type: Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169); 47; 835-844
    Format: text
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    NASA TECHNICAL REPORTS
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