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| Paper: |
Travel-Time Analyses of an Emerging-Flux Region |
| Volume: |
415, The Second Hinode Science Meeting: Beyond Discovery-Toward Understanding |
| Page: |
417 |
| Authors: |
Nagashima, K.; Sekii, T.; Kosovichev, A. G.; Zhao, J.; Tarbell,T. D. |
| Abstract: |
Travel-time analyses of a newly-formed plage region are presented. The dataset has been obtained from the 12-hr Hinode observation of an emergingflux region (to be NOAA AR 10975) close to the disc center on 23 November 2007. The SOT provides data in Ca II H line and in Fe I 557.6nm line; we use both chromospheric intensity oscillation data and photospheric Dopplergrams for travel-time measurement by a cross-correlation method. In the plage region, we have detected a travel-time anomaly in the chromospheric data, but not in the photospheric data. This can be interpreted as a signature of downflows in the chromosphere. This result illustrates how time-distance techniques can be used to study chromospheric flows. |
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