Helioseismic Signature of Chromospheric Downflows in Acoustic Travel-Time Measurements from Hinode


We report on a signature of chromospheric downflows in two emerging-flux regions detected by time–distance helioseismology analysis. We use both chromospheric intensity oscillation data in the Ca ii H line and photospheric Dopplergrams in the Fe i 557.6nm line obtained by Hinode/SOT for our analyses. By cross-correlating the Ca ii oscillation signals, we… (More)


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