Imaging spectropolarimetry with two LiNbO3 Fabry Pérot interferometers and a spectrograph

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Instrumentation: Interferometers, Instrumentation: Polarimeters, Instrumentation: Spectrographs, Polarization, Sun: General

Scientific paper

Context. Narrow-band spectropolarimetry is used to obtain information about the velocity and magnetic field structure of the solar atmosphere. Several types of instruments are suited to these observations, each with different advantages and drawbacks. Aims: We set up a novel instrument combination using two LiNbO3 Fabry Pérot interferometers (FPI), a high-resolution grating spectrograph, and the ZIMPOL system for polarimetry at IRSOL. With this system, we can carry out imaging spectropolarimetry of any spectral line from 390 to 660 nm, with a spectral resolution of 30 mÅ at 630 nm. Methods: We describe the setup, its properties, and calculate the limitations induced by the FPI and the spectrograph. We carry out spectropolarimetric observations of the sunspot AR 11087 in different spectral lines with suitable Landé factors that could be used to derive the magnetic field strength in different height ranges of the solar atmosphere. Results: The main advantage of our instrument compared to similar systems is that no special prefilters are required for each spectral line. A slight disadvantage is the spatial smearing induced by the dispersion of the finite transmission profiles of the FPI, which however is of the same magnitude as the seeing-limited resolution of 1-2″ at IRSOL. Conclusions: We demonstrate that this particular instrument combination is well suited to spectropolarimetry at IRSOL.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Imaging spectropolarimetry with two LiNbO3 Fabry Pérot interferometers and a spectrograph does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Imaging spectropolarimetry with two LiNbO3 Fabry Pérot interferometers and a spectrograph, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Imaging spectropolarimetry with two LiNbO3 Fabry Pérot interferometers and a spectrograph will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1735717

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.