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    A quantitative test of Jones NTC beaming theory using CLUSTER constellation

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    Authors
    Grimald, S.
    Décréau, P.M.E.
    Canu, P.
    Suraud, X.
    Vallières, X.
    Darrouzet, F.
    Harvey, C.C.
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    Discipline
    Physical sciences
    Subject
    electromagnetic radiation
    magnetosphere
    quantitative analysis
    radiation budget
    radio wave
    spacecraft
    theory
    Audience
    Scientific
    Date
    2007
    Metadata
    Show full item record
    Description
    Non-thermal continuum (NTC) radiation is, with auroral kilometric radiation (AKR), one of the two electromagnetic emissions generated within the Earth's magnetosphere and radiated into space. The location of the source of NTC has been sought for several decades, with only limited success. The constellation formed by the four CLUSTER spacecraft provides the possibility of triangulation in the vicinity of the source, thus allowing progress in source localisation, while simultaneously revealing the beaming properties of NTC radio sources. We present a case event showing two beams localised on opposite sides of the magnetic equator. At any selected frequency, triangulation points to a single region source of small size. Its position is compatible with the range of possible loci of sources predicted by the radio window theory of Jones (1982) in a frame of constraints relaxed from the simple sketch proposed in early works. The analysis of similar observations from the Dynamics Explorer 1 by Jones et al. (1987) enabled the authors to claim validation of the radio window theory. CLUSTER observations, however, reveal a large beaming cone angle projected onto the ecliptic plane, a feature unobservable by Dynamics Explorer which had a different spin axis orientation. According to the radio window theory, such a large observed cone angle can only be formed by a series of point sources, each beaming in a narrow cone angle. This study demonstrates the difficulty of validating NTC linear generation mechanisms using global beaming properties alone.
    Citation
    Grimald, S.; Décréau, P.M.E.; Canu, P.; Suraud, X.; Vallières, X.; Darrouzet, F.; Harvey, C.C. (2007). A quantitative test of Jones NTC beaming theory using CLUSTER constellation. , Annales Geophysicae, Vol. 25, Issue 3, 823-831, DOI: 10.5194/angeo-25-823-2007.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/4369
    doi: http://dx.doi.org/10.5194/angeo-25-823-2007
    scopus: 2-s2.0-34047157141
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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