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Figure 1: Meudon spectroheliogram in CaII K1v (blue wing of CaII K 393.4 nm), on 2004 July 14 at 07:36 UT, showing NOAA 0644. The black box corresponds to the MSDP field of view. |
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Figure 2: SOHO/MDI magnetogram on 2004 July 15 at 06:23 UT, showing NOAA 0644. We observed with the MSDP the eastern part of the spot (the black box corresponds to the MSDP field of view); the magnetic field found by MDI in this spot was between -1000 and 1000 Gauss, in agreement with our results (courtesy SOHO/MDI). |
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Figure 3:
Effect of image accumulation on the determination of magnetic fields
( top: after summation of 20 determinations after destretching single; bottom: single
determination). The field of view is
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Figure 4:
Quiet area
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Figure 5: Velocities versus magnetic field (absolute value) at 288 mÅ (170 km), 5mn filtered for |B//|>60 Gauss. Positive velocity denotes downflow. |
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Figure 6: Intensity at 144 mÅ versus magnetic field (absolute value) at 288 mÅ (170 km) for |B//|>60 Gauss. |
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Figure 7: Velocity at 288 mÅ (170 km) versus intensity at 144 mÅ for |B//| <200 Gauss (dots) and |B//|>500 Gauss (diamonds). Positive velocity denotes downflow. |
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Figure 8:
Observation at time t=14 mn, field of view of
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Figure 9: Magnetic bright feature (A) time evolution, coordinates (463, 18) where V// <0 (downward) and B// >0. B// in Gauss and V// in m/s. In the bottom plots, dot and solid lines represent depth at 288 and 144 mÅ respectively. |
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Figure 10: Magnetic bright feature (B) time evolution, coordinates (784, 43) where V//<0 (downward) and B// <0. B// in Gauss and V// in m/s. In the bottom plots, dot and solid lines represent depth at 288 and 144 mÅ respectively. |
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Figure 11: Time evolution of different parameters of the Moving Magnetic Feature (MMF): B// in Gauss and V// in m/s. Top left: MMF displacement in arcsec during the sequence; top right: MMF magnetic field at 144 mÅ time evolution which is fairly constant during the sequence; bottom left: core intensity time evolution of the MMF which is is constant during the sequence; bottom right: MMF Doppler velocity at 144 mÅ, time evolution. We note strong modification of the downflow amplitude between -0.6 km s-1 to -1.2 km s-1 during the sequence. |
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Figure 12:
Moving Magnetic Feature (MMF), dark feature, time evolution (magnetic field). Field of view is
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