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    Spatio-temporal structure of a poloidal Alfvn wave detected by Cluster adjacent to the dayside plasmapause

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    Authors
    Schäfer, S.
    Glassmeier, K.H.
    Eriksson, P.T.I.
    Mager, P.N.
    Pierrard, V.
    Fornaçon, K.H.
    Blomberg, L.G.
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    Discipline
    Physical sciences
    Subject
    azimuth
    cluster analysis
    detection method
    electric field
    plasma
    standing wave
    Audience
    Scientific
    Date
    2008
    Metadata
    Show full item record
    Description
    A case study of a poloidal ULF pulsation near the dayside plasmapause is presented based on Cluster observations of magnetic and electric fields. The pulsation is detected close to the magnetic equatorial plane at L shells L=[4.4, 4.6] and oscillates with a frequency of f=23 mHz. Investigating the wave energy flux reveals the standing wave nature of the observed pulsation. An estimation of the azimuthal wave number exposes a narrow azimuthal structure of the wave field with m≈160. Spatial and temporal characteristics of the pulsation are analyzed in detail by representing data in a field line related coordinate system and a range-time-intensity representation. This allows an estimation of both the spatial extension of the wave field in the radial direction and its temporal decay rate. The analysis furthermore indicates that the same field lines are excited to a standing wave oscillation twice. Furthermore an accurate identification of a phase jump of the wave field across L shells is possible. Comparing the radial localization of the detected wave with theoretically expected field line eigenfrequencies reveals that the wave field is confined in the Alfvn resonator at the outer edge of the plasmapause.
    Citation
    Schäfer, S.; Glassmeier, K.H.; Eriksson, P.T.I.; Mager, P.N.; Pierrard, V.; Fornaçon, K.H.; Blomberg, L.G. (2008). Spatio-temporal structure of a poloidal Alfvn wave detected by Cluster adjacent to the dayside plasmapause. , Annales Geophysicae, Vol. 26, Issue 7, 1805-1817, DOI: 10.5194/angeo-26-1805-2008.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/4328
    doi: http://dx.doi.org/10.5194/angeo-26-1805-2008
    scopus: 2-s2.0-46449086376
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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