Magnetic connectivity of coronal fields: geometrical versus topological description

V. S. Titov, G. Hornig

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)


    We analyse the mapping produced by the field lines which connect photospheric areas of positive and negative magnetic polarity on the Sun. The geometrical quantities independent of the direction of such a mapping (from positive to negative polarity, and vice versa) are introduced. They yield a complete description of the field line connectivity in coronal magnetic configurations and, in particular, in quasi-separatrix layers (QSLs). The elementary magnetic flux tubes are enormously squashed in QSLs without giving the true jump in the field-line mapping, as it occurs at the genuine separatrix surfaces. So the QSLs may be present even in topologically trivial magnetic configurations. This is illustrated by an example relevant to solar flare events.
    Original languageEnglish
    Pages (from-to)1087-1092
    Number of pages6
    JournalAdvances in Space Research
    Issue number7
    Publication statusPublished - Apr 2002


    • Quasi-separatrix layers
    • Magnetic flux
    • Solar flares


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