Fine-Scan Velocity and Magnetic- field Measurements in Solar Active Regions
Abstract
Fine scan (5″ × 5″ aperture) simultaneous Doppler and magnetograms have been obtained over solar active regions near the central meridian passage. Besides the mainly horizontal Evershed motion in sunspots, there appears a conspicuous descending motion over all active regions. A comparison of Hα-filtergrams with the fine scan magnetograms shows that dark filaments generally lie along the neutral longitudinal magnetic zone, while the Hα-fibrils lie along the field lines, joining regions of opposite polarity.
- Publication:
-
Solar Physics
- Pub Date:
- January 1971
- DOI:
- 10.1007/BF00154499
- Bibcode:
- 1971SoPh...16...40B
- Keywords:
-
- Active Region;
- Field Line;
- Opposite Polarity;
- Solar Active Region;
- Magnetic Zone