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  • 1
    Online Resource
    Online Resource
    Density structures inside the plasmasphere: Cluster observations
    Copernicus GmbH ; 2004
    In:  Annales Geophysicae Vol. 22, No. 7 ( 2004-07-14), p. 2577-2585
    Details
    In: Annales Geophysicae, Copernicus GmbH, Vol. 22, No. 7 ( 2004-07-14), p. 2577-2585
    Abstract: Abstract. The electron density profiles derived from the EFW and WHISPER instruments on board the four Cluster spacecraft reveal density structures inside the plasmasphere and at its outer boundary, the plasmapause. We have conducted a statistical study to characterize these density structures. We focus on the plasmasphere crossing on 11 April 2002, during which Cluster observed several density irregularities inside the plasmasphere, as well as a plasmaspheric plume. We derive the density gradient vectors from simultaneous density measurements by the four spacecraft. We also determine the normal velocity of the boundaries of the plume and of the irregularities from the time delays between those boundaries in the four individual density profiles, assuming they are planar. These new observations yield novel insights about the occurrence of density irregularities, their geometry and their dynamics. These in-situ measurements are compared with global images of the plasmasphere from the EUV imager on board the IMAGE satellite.
    Type of Medium: Online Resource
    ISSN: 1432-0576
    URL: Article
    DOI: 10.5194/angeo-22-2577-2004
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2004
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  • 2
    Online Resource
    Online Resource
    P300 Component Identification Using Source Analysis Techniques: Reduced Latency Variability
    Ovid Technologies (Wolters Kluwer Health) ; 2003
    In:  Journal of Clinical Neurophysiology Vol. 20, No. 1 ( 2003-02), p. 26-34
    Details
    In: Journal of Clinical Neurophysiology, Ovid Technologies (Wolters Kluwer Health), Vol. 20, No. 1 ( 2003-02), p. 26-34
    Type of Medium: Online Resource
    ISSN: 0736-0258
    URL: Article
    DOI: 10.1097/00004691-200302000-00003
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2003
    detail.hit.zdb_id: 2065729-8
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  • 3
    Online Resource
    Online Resource
    Scales of heliospheric current sheet coherence between 1 and 5 AU
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Space Physics Vol. 106, No. A8 ( 2001-08), p. 15963-15971
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 106, No. A8 ( 2001-08), p. 15963-15971
    Abstract: The structure of the heliospheric current sheet (HCS) at Ulysses and at Wind is compared during the period of near‐radial alignment in 1998. Electron heat flux and magnetic field data are used to determine true magnetic field polarity. During the solar rotation period surrounding alignment there was considerable disagreement between the HCS crossings at Wind and those predicted from the corresponding source surface map, both in number and in location, consistent with the disordered, temporally varying solar wind at this ascending phase of the solar cycle. Despite this complexity the four crossings closest to the time of radial alignment at Wind were successfully identified in Ulysses data with use of a one‐dimensional hydrodynamic code. Further, minimum variance analysis for the first two crossings, which were separated by only 16 hours at Wind, indicated coherent propagation of a large‐scale warp in the HCS. Analysis of the local structure of the HCS on the four crossings, however, revealed a high level of variability both from case to case and from one spacecraft to the other. For example, the third crossing at Wind was a single‐sheet crossing adjacent to structures with fields folded back on themselves and a brief period of counter‐streaming electrons implying a transient structure. At Ulysses multiple sheets were encountered. At the fourth crossing Wind passed through a counterstreaming event with a flux rope signature containing a south pointing axis, while Ulysses passed through a flux tube with little field rotation and northward pointing field. The results are consistent with the view that the heliospheric current sheet is coherent as a global structure but highly variable in local structure over angular distances of a few degrees.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JA000109
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    detail.hit.zdb_id: 3094268-8
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  • 4
    Online Resource
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    Status epilepticus with neuron-reactive serum antibodies: Response to plasma exchange
    Ovid Technologies (Wolters Kluwer Health) ; 2000
    In:  Neurology Vol. 55, No. 9 ( 2000-11-14), p. 1421-1421
    Details
    In: Neurology, Ovid Technologies (Wolters Kluwer Health), Vol. 55, No. 9 ( 2000-11-14), p. 1421-1421
    Type of Medium: Online Resource
    ISSN: 0028-3878 , 1526-632X
    URL: Article
    DOI: 10.1212/WNL.55.9.1421
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2000
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  • 5
    Online Resource
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    Transients at the dusk side magnetospheric boundary: Surface waves or isolated plasma blobs?
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Space Physics Vol. 106, No. A11 ( 2001-11), p. 25503-25516
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 106, No. A11 ( 2001-11), p. 25503-25516
    Abstract: We revisit Interball‐Tail and Magion‐4 observations of the dusk side magnetospheric boundary on February 15–16, 1996. The observed transient behavior of the boundary can be interpreted in terms of surface waves or as the manifestation of isolated magnetosheath plasma entities embedded in the magnetosphere. We examine the arguments for each of these interpretations with high time resolution magnetic field and plasma data and by exploiting the dual‐satellite nature of the observations. We find strong evidence for magnetic field and flow vortices near the magnetospheric boundary and hence for the existence of flux tubes with helicoidal field lines; such structures can be associated with both interpretations. The cross‐correlation between the dual satellite observations and the apparent periodicity strongly suggest a Kelvin‐Helmholtz surface wave, although other interpretations are not impossible. In any case, the observations for this particular event allow us to derive constraints on surface wave generation mechanisms and on scenarios that could account for the presence of isolated plasma elements in the magnetosphere.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2001JA900044
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    Transient development of magnetohydrodynamic wave mode conversion layers
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Space Physics Vol. 106, No. A8 ( 2001-08), p. 15609-15619
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 106, No. A8 ( 2001-08), p. 15609-15619
    Abstract: We study the transmission, reflection, and absorption of ultralow frequency waves at density nonuniformities in low beta plasmas, such as plasma structures in the solar corona, inhomogeneities in the solar wind, and, at times, in the magnetopause. We simulate the time‐dependent interaction of a monochromatic magnetohydrodynamic (MHD) wave with a planar plasma transition layer aligned with the magnetic field. When the incident wave front reaches the initially unperturbed transition layer, a resonant sheet starts to develop within a thin layer where the conditions for resonant MHD wave mode conversion are satisfied. In this sheet the wave amplitude is found to grow exponentially until a saturation level is reached due to dissipative effects. Dissipation controls the thickness of the sheet, the saturation level, and the time needed to reach the saturation regime. The resonantly absorbed energy, however, is essentially independent of the dissipation coefficient. The simulations are carried out in the context of linear resistive low beta magnetohydrodynamics. The simulation results are important for the case of the magnetopause as the enhanced wave amplitudes found inside the transition could promote diffusive mass transport across the layer.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2001JA900045
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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  • 7
    Online Resource
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    Ulysses observations of sector boundaries at aphelion
    American Geophysical Union (AGU) ; 2000
    In:  Journal of Geophysical Research: Space Physics Vol. 105, No. A7 ( 2000-07), p. 15689-15698
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 105, No. A7 ( 2000-07), p. 15689-15698
    Abstract: We study a sample of sector boundaries observed by Ulysses near its early 1998 aphelion at 5.4 AU. We relate these sector boundaries to solar wind structure seen by Wind at 1 AU, guided by a hydrodynamic simulation. For each Ulysses sector boundary we are able to identify a corresponding 1 AU sector boundary, except when strong transients are present. Sector boundaries appear embedded in complex plasma structures that generally are in a state of pressure balance. Minimum variance analysis confirms the tangential discontinuity nature of the heliospheric current sheet (HCS) and indicates that the current sheet tends to be inclined more steeply than at 1 AU (HCS normal closer to the equatorial plane and nearly radially outward). We discuss evidence for the nonplanarity of the current sheet. Magnetic field depressions are characteristic features of the sector boundaries. We attribute them to particles that are magnetically confined inside the current sheet and that carry the diamagnetic current responsible for the large magnetic field rotation.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JA900040
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2000
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    SSG: 16,13
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  • 8
    Online Resource
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    Linear magnetohydrodynamic response of the magnetopause to magnetosheath fluctuations
    American Geophysical Union (AGU) ; 2000
    In:  Journal of Geophysical Research: Space Physics Vol. 105, No. A10 ( 2000-10), p. 23167-23177
    Details
    In: Journal of Geophysical Research: Space Physics, American Geophysical Union (AGU), Vol. 105, No. A10 ( 2000-10), p. 23167-23177
    Abstract: We study the response of the magnetopause to incident magnetosheath ULF fluctuations by combining the linear magnetohydrodynamics (MHD) approach with harmonic analysis. We consider plane wave fronts arriving at the magnetopause with various tangential wavelengths. The fluctuations in the magnetosheath are pulse trains or waves with a broadband ULF spectrum. We obtain the magnetopause response to these fluctuations based on the computation of the transmission, reflection, and absorption characteristics of monochromatic linear MHD waves at different frequencies in a given equilibrium magnetopause configuration. Particular attention is given to MHD wave mode conversion as an ingredient for explaining the enhanced electromagnetic fluctuation level near the magnetopause.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JA900083
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2000
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    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
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    SSG: 16,13
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  • 9
    Online Resource
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    Structural analysis of periodic surface waves on the magnetospheric boundary
    Elsevier BV ; 2003
    In:  Planetary and Space Science Vol. 51, No. 12 ( 2003-10), p. 757-768
    Details
    In: Planetary and Space Science, Elsevier BV, Vol. 51, No. 12 ( 2003-10), p. 757-768
    Type of Medium: Online Resource
    ISSN: 0032-0633
    URL: Article
    DOI: 10.1016/S0032-0633(03)00112-0
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2003
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    SSG: 16,12
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  • 10
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    Insulin-like growth factor binding protein-4 interacts with centrosomes and microtubules in primary astrocytes
    Elsevier BV ; 2004
    In:  Neuroscience Vol. 125, No. 2 ( 2004-1), p. 381-390
    Details
    In: Neuroscience, Elsevier BV, Vol. 125, No. 2 ( 2004-1), p. 381-390
    Type of Medium: Online Resource
    ISSN: 0306-4522
    URL: Article
    DOI: 10.1016/j.neuroscience.2004.01.041
    RVK:
    XA 10000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2004
    detail.hit.zdb_id: 1498423-4
    SSG: 12
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