High spatial resolution capabilities of Doppler measurements with the Pic du Midi MSDP spectrograph
1
Laboratoire d'Astrophysique de Toulouse, Observatoire Midi-Pyrénées, 14 avenue É. Belin, 31400 Toulouse, France
2
LESIA, Observatoire de Paris, Section de Meudon, 92195 Meudon, France
Corresponding author: Th. Roudier, roudier@bigorre.bagn.obs-mip.fr
Received:
7
April
2003
Accepted:
3
July
2003
We analyse observations
in the NaD1 line (λ 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
3). Dopplershifts are obtained in the middle and high photosphere.
The smallest granules 04 show
upward motions in the middle photosphere.
Key words: Sun: photosphere / Sun: granulation
© ESO, 2003