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  • 1
    Electronic Resource
    Electronic Resource
    Two-dimensional mapping of the plasma density in the upper atmosphere with computerized ionospheric tomography (CIT) : The 39th annual meeting of division of plasma physics of APS (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 2010-2021 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tomographic imaging of the ionosphere is a recently developed technique that uses integrated measurements and computer reconstructions to determine electron densities. The integral of electron density along vertical or oblique paths is obtained with radio transmissions from low-earth-orbiting (LEO) satellite transmitters to a chain of receivers on the earth's surface. Similar measurements along horizontal paths can be made using transmissions from Global Position System (GPS) navigation satellites to GPS receivers on LEO spacecraft. Also, the intensities of extreme ultraviolet (EUV) emissions can be measured with orbiting spectrometers. These intensities are directly related to the integral of the oxygen ion and electron densities along the instrument line of sight. Two-dimensional maps of the ionospheric plasma are produced by analyzing the combined radio and EUV data using computerized ionospheric tomography (CIT). Difficulties associated with CIT arise from the nonuniqueness of the reconstructions, owing to limited angle measurements or nonoptimal receiver location. Improvements in both reconstruction algorithms and CIT measurement systems are being implemented to overcome these difficulties. New imaging systems being developed employ CIT for large area mapping of the plasma densities in the ionosphere. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872872
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Storm associated protonospheric depletion and recovery
    Amsterdam : Elsevier
    Planetary and Space Science 28 (1980), S. 453-458 
    Details
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0032-0633(80)90026-4
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Medium scale gravity waves in the ionospheric F-region and their possible origin in weather disturbances
    Amsterdam : Elsevier
    Planetary and Space Science 23 (1975), S. 493-507 
    Details
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0032-0633(75)90120-8
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Post-geomagnetic storm protonospheric replenishment (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 429-430 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The ATS-6 radio beacon experiment6 carried out at Aberystwyth (52.42N, 4.05W), while the geostationary satellite was stationed at 35E longitude,, allowed estimates to be made of both the plasmapheric tojal electron content (7VT) and the ionospheric Faraday electron content (N) to sufficient ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/271429a0
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  • 5
    Electronic Resource
    Electronic Resource
    Plasma fluxes between ionosphere and protonosphere (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 427-429 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The ATS-6 radio beacon experiment8 provides a method of estimating integrated net ionospheric-protonospheric fluxes on a continuous basis from the temporal changes in protono-spheric content. The receiving station at Aberystwyth (52.42N, 4.05W) for transmissions from the ATS-6 satellite ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/271427a0
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  • 6
    Electronic Resource
    Electronic Resource
    Ionospheric mid-latitude trough and the abrupt scintillation boundary (1975)
    [s.l.] : Nature Publishing Group
    Nature 254 (1975), S. 312-313 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Some 530 recordings of passes of the ionospheric beacon satellite BE-B (1964-64A) taken at Aberystwyth (52.42N, 4.05 W) were selected from the available records for the years 1966 to 1968 inclusive. The sample analysed comprised those records which showed irregular Faraday fading rates, indicating ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/254312a0
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  • 7
    Electronic Resource
    Electronic Resource
    The spatial structure of the dayside ionospheric trough (1998)
    Springer
    Annales geophysicae 16 (1998), S. 1169-1179 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere-magnetosphere interactions ; Polar ionosphere ; Radio science ; Ionospheric propagation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Tomographic imaging provides a powerful technique for obtaining images of the spatial distribution of ionospheric electron density at polar latitudes. The method, which involves monitoring radio transmissions from the Navy Navigation Satellite System at a meridional chain of ground receivers, has particular potential for complementing temporal measurements by other observing techniques such as the EISCAT incoherent-scatter radar facility. Tomographic reconstructions are presented here from a two-week campaign in November 1995 that show large-scale structuring of the polar ionosphere. Measurements by the EISCAT radar confirm the authenticity of the technique and provide additional information of the plasma electron and ion temperatures. The dayside trough, persistently observed at high latitudes during a geomagnetically quiet period but migrating to lower latitudes with increasing activity, is discussed in relationship to the pattern of the polarcap convection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-1169-4
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  • 8
    Electronic Resource
    Electronic Resource
    Imaging of structures in the high-latitude ionosphere: model comparisons (1998)
    Springer
    Annales geophysicae 16 (1998), S. 969-973 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (modelling and forecasting; polar ionosphere) ; Radio Science (instruments and techniques)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The tomographic reconstruction technique generates a two-dimensional latitude versus height electron density distribution from sets of slant total electron content measurements (TEC) along ray paths between beacon satellites and ground-based radio receivers. In this note, the technique is applied to TEC values obtained from data simulated by the Sheffield/UCL/SEL Coupled Thermosphere/Ionosphere/Model (CTIM). A comparison of the resulting reconstructed image with the ‘input’ modelled data allows for verification of the reconstruction technique. All the features of the high-latitude ionosphere in the model data are reproduced well in the tomographic image. Reconstructed vertical TEC values follow closely the modelled values, with the F-layer maximum density (NmF2) agreeing generally within about 10%. The method has also been able successfully to reproduce underlying auroral-E ionisation over a restricted latitudinal range in part of the image. The height of the F2 peak is generally in agreement to within about the vertical image resolution (25 km).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-0969-x
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  • 9
    Electronic Resource
    Electronic Resource
    Multi-instrument study of footprints of magnetopause reconnection in the summer ionosphere (2000)
    Springer
    Annales geophysicae 18 (2000), S. 1118-1127 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (ionosphere-magnetosphere interactions; particle precipitation; plasma temperature and density)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Results are presented from a multi-instrument investigation of the signatures of equatorial reconnection in the summer, sunlit ionosphere. Well-established ion dispersion signatures measured during three DMSP satellite passes were used to identify footprints in ionospheric observations made by radio tomography, and both the EISCAT ESR and mainland radars. Under the prevalent conditions of southward IMF with the Bz component increasing in magnitude, the reconnection footprint was seen to move equatorward through the ESR field-of-view. The most striking signature was in the electron temperatures of the F2 region measured by the EISCAT mainland radar that revealed significantly enhanced temperatures with a steep equatorward edge, in general agreement with the leading edge of the ion dispersion. It is suggested that this sharp transition in the electron temperature may be an indicator of the boundary, mapping from the reconnection site, between closed geomagnetic field lines and those opened along which magnetosheath ions precipitate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-000-1118-3
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  • 10
    Electronic Resource
    Electronic Resource
    Structure of the poleward wall of the trough and the inclination of the geomagnetic field above the EISCAT radar (1997)
    Springer
    Annales geophysicae 15 (1997), S. 740-746 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A special high-resolution routine of the EISCAT radar has been used to investigate the structure and development of the poleward wall of a deep trough in electron density. The feature was tracked by the radar during a 7-hour period under very quiet geomagnetic conditions. The field-aligned nature of the structure enabled an estimate to be made of the inclination of the geomagnetic field above EISCAT that was in good agreement with the current model. Observations of narrow field-aligned enhancements in electron temperature demonstrated that the wall of this trough is a dynamic feature, reforming regularly as the electron density responds on a time scale of tens of minutes to energy input from soft-particle precipitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-997-0740-8
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