Magnetic Fields at Mt. Wilson and MDI
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Transcript of Magnetic Fields at Mt. Wilson and MDI
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Magnetic Fields atMt. Wilson and MDI
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The 150-foot Tower Spectrograph Measures 12 line pairs simultaneously
• The long-term program uses 5250.
• The full coverage of 6768 allows modeling of MDI.
• The Na D2 line permits interesting studies of height dependence.
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The Fluxtube Magnetic Structure Complicates Interpretation
• This diagram shows the relationship between the magnetic structure and our points of observation.
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Comparison between MWO and MDI
• We interpolate and bin the MDI magnetogram to match the temporal/spatial location of MWO pixels. This is MWO as seen by MDI.
• We reconstruct the 6768 line profile and apply model MDI filters to it to find a MWO-modeled field. This is MDI as seen by MWO.
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Temporal trends near disk center
• Approximately 1200 MWO/MDI intercomparisons have been constructed to yield a scale factor between MDI and MWO.
• These two are for near disk center areas.
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Temporal trends near the limb.
• The outer sections of the solar image have been divided into quadrants. The scatter is much larger here and there are fewer points per image.
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Magnetic geometries are not all vertical.
• The potential field solutions used in the Wang-Sheeley model assume the field geometry is vertical at the photosphere. This is demonstrably an inaccurate assumption.
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The geometry of the rotating sun and magnetic fields
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Solar rotation and magnetic geometry.
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Neutral lines and tilt map
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Comparison to TRACE