Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp53a..02m&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP53A-02
Physics
7507 Chromosphere, 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835), 7529 Photosphere
Scientific paper
Hα fibrils are generally thought to trace out the horizontal component of the chromospheric magnetic field. They can be oriented at any angle relative to the polarity inversion line (PIL), where the line--of--sight component of the photospheric field changes sign. Filaments are found where the fibrils invariably run almost parallel to the PIL, forming a filament channel. We present three examples showing Hα fibrils that change their orientation, over one or two days, from nearly perpendicular to nearly parallel to the PIL. Comparing the Hα filtergrams with magnetograms from the Michelson Doppler Imager, we find that the fibrils become aligned with the PIL as supergranular convection brings opposite-polarity magnetic flux together; shearing motions along the PIL, when present, act mainly to accelerate the rate of diffusive annihilation. We conclude that the reorientation of the fibrils is due to the cancellation and submergence of the transverse field component (B⊥), leaving behind the preexisting axial field component B∥).
Muglach Karin
Wang Yadong
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