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Question
What mechanism changes magnetic field lines
from perpendicular to the polarity inversion line
(PIL) to parallel to the PIL?
- Large-scale shearing motions parallel to the PIL- Emergence of a flux rope with its axis parallel to the
PIL- Flux cancellation at the PIL
Database
• BBSO H alpha images• MDI: synoptic magnetograms (96 min)
MDI 1 min cadence magnetograms
three cases:- 20-23 Jun 2002- 12-15 Jan 2002- 04-08 Oct 2002