Observed Line Profiles and Mass Fluxes in the Transition Region above Sunspots
Abstract
Spectrograms obtained with the HRTS show strong mass flows through the transition zone that are particularly prominent above sunspot regions. Most characteristic for the flow associated with sunspots are regions with supersonic downflows, but upward flowing gas is also observed with generally smaller velocities. The flow pattern changes from one day to the next and even within a time span of minutes. An apparent lack of balance between up- and downflowing massfluxes is found. Generally the net massflux appears to be directed downward. Possible reasons for this result are briefly discussed in terms of observability and line emission area filling factor.
- Publication:
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Publications of Debrecen Heliophysical Observatory
- Pub Date:
- 1990
- Bibcode:
- 1990PDHO....7..244M
- Keywords:
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- Solar Transition Region: Sunspots;
- Solar Transition Region: Mass Flow