Non-ideal MHD properties of magnetic flux tubes in the solar photosphere

Jens Kleimann, Gunnar Hornig

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Magnetic flux tubes reaching from the solar convectivezone into the chromosphere have to pass through the relatively cool, and therefore non-ideal (i.e. resistive) photospheric region enclosed between the highly ideal sub-photospheric and chromospheric plasma. It is shown that stationary MHD equilibria of magnetic flux tubes which pass through this region require an inflow of photospheric material into the flux tube and a deviation from iso-rotation along the tube axis. This means that there is a difference in angular velocity of the plasma flow inside the tube below and above the non-ideal region. Both effects increase with decreasing cross section of the tube. Although for characteristic parameters of thick flux tubes the effect is negligible, a scaling law indicates its importance for small-scale structures. The relevance of this 'inflow effect' for the expansion of flux tubes above the photosphere is discussed.
    Original languageEnglish
    Pages (from-to)47-62
    Number of pages16
    JournalSolar Physics
    Volume200
    Issue number1/2
    DOIs
    Publication statusPublished - 2001

    Keywords

    • Magnetohydrodynamics (MHD)
    • Magnetic flux

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