Temperature and Center-Limb Variations of Transition Region Velocities
Abstract
HRTS data from the Spacelab 2 mission are used to derive the center-limb and temperature variations of the mean velocity and the velocity variance in the solar chromosphere and transition zone. The mean velocity is found to vary much more rapidly from center to limb and with temperature than does the velocity variance. Also, the mean velocity shows a characteristic signature at some magnetic neutral lines in accordance with the findings of Klimchuk (1987) from Solar Maximum Mission (SMM) data. The velocity variance does not show a characteristic signature at the neutral lines but shows an inverse correlation with intensity. The latter is interpreted as reduced velocity variance in strong field regions. The results are discussed in terms of downflow along lines of force in magnetic arcades.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1989
- DOI:
- 10.1086/168033
- Bibcode:
- 1989ApJ...346..514A
- Keywords:
-
- Plasma Dynamics;
- Solar Atmosphere;
- Solar Limb;
- Solar Temperature;
- Chromosphere;
- Coronal Loops;
- H Alpha Line;
- Solar Magnetic Field;
- Solar Maximum Mission;
- Sunspots;
- Solar Physics;
- SUN: ATMOSPHERIC MOTIONS;
- SUN: ROTATION;
- SUN: TRANSITION REGION