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| Paper: |
Infrared Stokes Spectro-Polarimeter at the National Astronomical Observatory of Japan |
| Volume: |
437, Solar Polarization Workshop 6 |
| Page: |
371 |
| Authors: |
Hanaoka, Y.; Sakurai, T.; Shinoda, K.; Noguchi, M.; Miyashita, M.; Fukuda, T.; Suzuki, I.; Hagino, M.; Arai, T.; Yamasaki, T.; Takeyama, N. |
| Abstract: |
We are now constructing an infrared spectro-polarimeter for the Solar
Flare Telescope of NAOJ. It observes the full Sun in two wavelength
bands, one near 1.56 μm for highly Zeeman-sensitive spectral lines
of Fe I and the other near 10830 Å for He I and Si I lines. The
instrument records full Stokes profiles, and a Stokes inversion
process will give information on the strength and orientation of the
magnetic field vector for both of the photosphere and the
chromosphere. The infrared detector we are using is an InGaAs camera
manufactured by a Belgian company Xenics. Its format is 640×512
pixels and its read-out speed is 90 frames s-1. The solar disk
will be covered by two swaths (the northern and southern hemispheres)
of 640 pixels each. The final magnetic maps will be made of 1200×1200
pixels with a pixel size of 1.8 arcsec. Now we are operating regular
observations and generate full-disk, full-Stokes maps
(a few maps per day). Our ultimate goal is to derive the
distribution of magnetic helicity over the whole surface of the Sun,
not only in sunspots and active regions. |
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