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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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