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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20240124T160000
DTEND;TZID=Atlantic/Canary:20240124T170000
UID:iactalks-1744
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1744
CREATED:2024-01-24T16:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:IAU G5: High-precision solar spectroscopy with the Göttingen FTS
DESCRIPTION:IAU G5: High-precision solar spectroscopy with the Göttingen F
 TS\nDr. Ansgar Reiners\n\nThe Institute for Astrophysics and Geophysics (I
 AG) in Göttingen       operates a Fourier-Transform Spectrograph (FTS
 ) that can be fed by       either a 50cm siderostat or an integrating sphe
 re. In 2016, we       published a solar flux atlas (disk-integrated) at wa
 velengths       405-2300nm. Being largely comparable to the Kitt Peak spec
 tral       atlases in terms of resolution and signal-to-noise, our focus l
 ies       on an accurate calibration of frequencies (wavelengths) because 
 we       are interested in absolute convective blueshift of solar surface 
       features. Recently, we published an atlas of the quiet solar surface
  at       different limb positions (spatially resolved Sun) and investigat
 ed       convective velocities across the solar surface and in different  
      spectral lines (Ellwarth et al., 2023 and in press). Furthermore,    
    we studied the impact of centre-to-limb variation on exoplanet       tr
 ansit observations (Reiners et al., 2023). We are currently       collecti
 ng data of active solar regions with the goal to measure       convective 
 blueshift as a function of limb position and magnetic       field strength
 . In the talk, I will provide an overview of our       program with a focu
 s on the challenges we met in our attempts to       determine Doppler velo
 cities at the solar surface at m/s accuracy.\n \nZoom link: https://r
 ediris.zoom.us/j/97531318437?pwd=TEpGZGVkNkpBcXBLWVlNTGt6bkdNUT09Meeting I
 D: 975 3131 8437\nPasscode: 147922
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