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  • 1
    Electronic Resource
    Electronic Resource
    Continuous magnetic reconnection at Earth's magnetopause (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 426 (2003), S. 533-537 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The most important process that allows solar-wind plasma to cross the magnetopause and enter Earth's magnetosphere is the merging between solar-wind and terrestrial magnetic fields of opposite sense—magnetic reconnection. It is at present not known whether reconnection can happen in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02084
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  • 2
    Electronic Resource
    Electronic Resource
    Auroral-arc splitting by intrusion of a new convection channel (1997)
    Springer
    Annales geophysicae 14 (1997), S. 1257-1264 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract During a run of the Common Programme Three of the EISCAT radar the splitting of an auroral arc was observed by high time-resolution, ground-based cameras when the UHF radar beam was close to the arc. The evening eastward electrojet situation with a large-scale northward ionospheric electric field was disturbed by the intrusion of a convection channel with southward electric field from the east. The interaction of the new convection channel with the auroral arc caused changes in arc brightness and arc splitting, i.e. the creation of a new arc parallel to the preexisting auroral arc. The event is described as one possibility for the creation of parallel arcs during slightly disturbed magnetic conditions far from the Harang discontinuity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-996-1257-2
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  • 3
    Electronic Resource
    Electronic Resource
    Ionospheric response to variable electric fields in small-scale auroral structures (1998)
    Springer
    Annales geophysicae 16 (1998), S. 1343-1354 
    Details
    ISSN: 0992-7689
    Keywords: Auroral ionosphere ; Ionosphere-magnetosphere interactions ; EISCAT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract High time and space resolution optical and radar measurements have revealed the influence of electric fields on E-region electron density profiles in small-scale auroral structures. Large electric fields are present adjacent to auroral filaments produced by monoenergetic electron fluxes. The ionisation profiles measured within and beside the auroral filaments show the effects of plasma convection due to electric fields as well as the consequences of the response time to large and dynamic fluxes of energetic electrons. Without high-resolution optical measurements, the interpretation of the radar data is limited.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-1343-8
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  • 4
    Electronic Resource
    Electronic Resource
    Optical tomography of the aurora and EISCAT (1998)
    Springer
    Annales geophysicae 16 (1998), S. 1332-1342 
    Details
    ISSN: 0992-7689
    Keywords: Tomography ; Aurora ; EISCAT ; Ionosphere ; Conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Tomographic reconstruction of the three-dimensional auroral are emission is used to obtain vertical and horizontal distributions of the optical auroral emission. Under the given experimental conditions with a very limited angular range and a small number of observers, algebraic reconstruction methods generally yield better results than transform techniques. Different algebraic reconstruction methods are tested with an auroral are model and the best results are obtained with an iterative least-square method adapted from emission-computed tomography. The observation geometry used during a campaign in Norway in 1995 is tested with the are model and root-mean-square errors, to be expected under the given geometrical conditions, are calculated. Although optimum geometry was not used, root-mean-square errors of less than 2% for the images and of the order of 30% for the distribution could be obtained. The method is applied to images from real observations. The correspondence of original pictures and projections of the reconstructed volume is discussed, and emission profiles along magnetic field lines through the three-dimensionally reconstructed arc are calibrated into electron density profiles with additional EISCAT measurements. Including a background profile and the temporal changes of the electron density due to recombination, good agreement can be obtained between measured profiles and the time-sequence of calculated profiles. These profiles are used to estimate the conductivity distribution in the vicinity of the EISCAT site. While the radar can only probe the ionosphere along the radar beam, the three-dimensional tomography enables conductivity estimates in a large area around the radar site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-1332-y
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  • 5
    Electronic Resource
    Electronic Resource
    PIGE and PIXE analyses of pentasil type boroaluminosilicates (1988)
    Springer
    Journal of radioanalytical and nuclear chemistry 120 (1988), S. 281-287 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The elemental composition of various synthetic crystalline sodium-boroaluminosilicates, especially the Al content and the silicon to aluminium bulk ratio, were determined by means of the combination of PIGE (Proton-Induced Gamma-Ray Emission Spectrometry) and PIXE (Proton-Induced X-Ray Emission Spectrometry). Light elements (B, O, Na, Al) were determined by means of gamma-ray emission. Proton-induced X-ray emission provided information on heavy elements present down to impurities. The Si/Al ratios, which mainly determine the catalytic and adsorptive properties of the zeolites, are compared with those obtained with other methods (EPMA, H2O sorption capacity) and show good agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037343
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