Helioseismic and Magnetic Imager Multi-height Dopplergrams

2); (2) Georg-August-Universit\"at; (3) Stanford University; (4) ESA); Aaron Birch (1); Bernhard Fleck (4) ((1) MPS; Bj\"orn L\"optien (2); Kaori Nagashima (1); Laurent Gizon (1; Sebastien Couvidat (3)

arxiv: 1401.3182 · v1 · pith:YOWZSRMEnew · submitted 2014-01-14 · 🌌 astro-ph.SR

Helioseismic and Magnetic Imager Multi-height Dopplergrams

Kaori Nagashima (1) , Laurent Gizon (1 , 2) , Aaron Birch (1) , Bj\"orn L\"optien (2) , Sebastien Couvidat (3) , Bernhard Fleck (4) ((1) MPS , (2) Georg-August-Universit\"at

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(3) Stanford University (4) ESA)

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keywords dopplergramsfrequencyhelioseismicimagermagneticmulti-heightsolarabove

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We study Doppler velocity measurements at multiple heights in the solar atmosphere using a set of six filtergrams obtained by the Helioseismic magnetic Imager on board the Solar Dynamics Observatory. There are clear and significant phase differences between core and wing Dopplergrams in the frequency range above the photospheric acoustic cutoff frequency, which indicates that these are really "multi-height" datasets.

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Helioseismic and Magnetic Imager Multi-height Dopplergrams

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