ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • GEOPHYSICS  (5)
  • 1975-1979  (5)
Collection
Keywords
Years
Year
  • 1
    facet.materialart.
    Unknown
    Observation and interpretation of particle and electric field measurements inside and adjacent to an active auroral arc (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; June 1
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Observations of intense velocity shear and associated electrostatic waves near an auroral arc (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Simultaneous measurements of energetic particles and ac electric fields made by the javelin sounding rocket NASA 8:56 during the late expansion phase of a magnetic storm have revealed an intense shear in plasma flow of magnitude 20 (m/s)/m at the edge of an auroral arc. Structure with two characteristic scales sizes is displayed in the region of shear. Larger structures are of the order of several kilometers in size. Intense irregularities with characteristic wavelengths smaller than the scale size of the shear have also been detected. The large-scale changes in the orientation of the charge sheet at the edge of the arc may be due to the Kelvin-Helmholtz branch; shorter-wavelength modes may be related to the shear driven resistive drift wave. Observations are consistent with the suggestion that velocity shear instabilities may play a role in the formation of high-latitude irregularities.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; June 1
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Evidence for a Rayleigh-Taylor type instability and upwelling of depleted density regions during equatorial spread F (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Recent rocket probe, barium cloud and radar measurements conducted during equatorial spread F conditions are interpreted in terms of a Rayleigh-Taylor gravitational instability operating on the bottomside of the F peak. The persistent theoretical problems associated with strong radar echoes typically observed in patch-like structures at high altitudes are explained in terms of regions of depleted plasma density which buoyantly rise against the gravitational field.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 3; Aug. 197
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Relations between transverse electric fields and field-aligned currents (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A model for the field-aligned propagation of transverse electric fields and associated field-aligned sheet currents is presented which takes into account the wave nature of the process. The model is applied to the separate cases of ionospheric and magnetospheric sources, and the resulting ionospheric electric field to field-aligned sheet current ratios are determined for comparison with experimental observations. It is found that the magnetospheric wave 'conductivity' for shear mode Alfven waves is small with respect to typical values of the height-integrated ionospheric Pedersen conductivity. For plasma convecting across a stationary disturbance a dynamic equilibrium is achieved in which field-aligned currents flow continuously away from the source on convecting field lines. Consistency with typical ionospheric electric fields requires that the field-aligned sheet currents are limited to around 0.1 A/m for ionospheric polarization sources, while magnetospheric sources are easily capable of 1 A/m or more.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; Apr. 1
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    Impulsive ion injection into the polar cusp (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Impulsive bursts of positive ions were observed in the polar cusp during the rocket flights. Dispersion of arrival time with energy implies a modulation or acceleration region at a distance of 11 to 13 earth radii, presumably in the magnetosheath. The ion energy spectra closely match typical magnetosheath spectra. The bursts had a duration of about 20 s and repetition period on the order of 100 s. These results suggest that ions have intermittent rather than continuous entry at the polar cusps. At times, the ion and electron precipitations were anticorrelated in a manner consistent with a parallel electric field.
    Keywords: GEOPHYSICS
    Type: Magnetospheric particles and fields Summer Advanced Study School; Aug 04, 1975 - Aug 15, 1975; Graz; Austria
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...