Travel-Time Analyses of an Emerging-Flux Region

Details Travel-Time Analyses of an Emerging-Flux Region Travel-Time Analyses of an Emerging-Flux Region

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..415..417n&link_type=abstract

The Second Hinode Science Meeting: Beyond Discovery-Toward Understanding ASP Conference Series, Vol. 415, proceedings of a meeti

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Travel-time analyses of a newly-formed plage region are presented. The dataset has been obtained from the 12-hr Hinode observation of an emerging-flux 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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