High spatial resolution capabilities of Doppler measurements with the Pic du Midi MSDP spectrograph

Details High spatial resolution capabilities of Doppler measurements with the Pic du Midi MSDP spectrograph High spatial resolution capabilities of Doppler measurements with the Pic du Midi MSDP spectrograph

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...409..793r&link_type=abstract

Astronomy and Astrophysics, v.409, p.793-797 (2003)

Astronomy and Astrophysics

Astrophysics

3

Sun: Photosphere, Sun: Granulation

Scientific paper

We analyse observations in the NaD1 line (lambda 5896 Å) obtained with the MSDP spectrograph of the Turret Dome of the Pic du Midi Observatory. Individual images reveal high spatial resolution and the data reduction shows the high capabilities of the spectrograph to get doppler measurements up to the limit of the resolution of the refractor (0\farcs3). Dopplershifts are obtained in the middle and high photosphere. The smallest granules 0\farcs4 show upward motions in the middle photosphere.

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