One-dimensional upward continuation of the ground magnetic field disturbance using spherical elementary current systems

Heikki Vanhamäki, Olaf Amm, Ari Viljanen

    Research output: Contribution to journalArticlepeer-review

    40 Citations (Scopus)

    Abstract

    Ionospheric equivalent currents are defined as spherical sheet currents, which reproduce the observed magnetic disturbances below the ionosphere. One way of determining these currents is to place several so called spherical elementary current systems (SECS) in the ionospheric height and to solve an inversion problem for the amplitudes of these systems. In previous studies this method has been applied to two-dimensional data sets, having both latitudinal and longitudinal spatial coverage (2D SECS method). In this paper a one-dimensional variant of this method (1D SECS) is developed. The 1D SECS method can be used even in those situations where the data set is one dimensional, e.g. with one meridionally aligned magnetometer chain. The applicability of the 1D SECS method is tested using both synthetic and real data. It is found that in real situations the errors in the 1D SECS results are 5-10% in current density profiles and ∼5% in integrated currents, when compared to the results of the more accurate 2D SECS method.

    Original languageEnglish
    Pages (from-to)613-625
    Number of pages13
    Journalearth, planets and space
    Volume55
    Issue number10
    DOIs
    Publication statusPublished - 2003

    All Science Journal Classification (ASJC) codes

    • Geology
    • Space and Planetary Science

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