Time-distance study of supergranulation
Abstract
Time-distance helioseismology is a valuable tool for examining near surface flows: accurate maps of supergranulation flows are produced from the travel times of surface gravity waves. The lifetimes of individual supergranules are measured from time-distance maps and found to be inconsistent with measurements obtained from autocorrelation techniques. The spatial cross-correlation shows a East-West shift over time, suggesting that supergranulation has two components which do not co-rotate.
- Publication:
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SOHO 10/GONG 2000 Workshop: Helio- and Asteroseismology at the Dawn of the Millennium
- Pub Date:
- January 2001
- Bibcode:
- 2001ESASP.464..577B
- Keywords:
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- SUPERGRANULATION;
- CONVECTION