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| Paper: |
NIRIS: The Second Generation Near-Infrared Imaging Spectro-polarimeter for the 1.6 Meter New Solar Telescope |
| Volume: |
463, 2nd ATST-EAST Workshop in Solar Physics: Magnetic Fields from the Photosphere to the Corona |
| Page: |
291 |
| Authors: |
Cao, W.; Goode, P. R.; Ahn, K.; Gorceix, N.; Schmidt, W.; Lin, H. |
| Abstract: |
The largest aperture solar telescope, the 1.6 m New Solar Telescope
(NST) has been installed at the Big Bear Solar Observatory (BBSO). To
take full advantage of the NST's greatest potential, we are upgrading
the routinely operational InfraRed Imaging Magnetograph (IRIM) to its
second generation, the NIRIS (Near-InfraRed Imaging
Spectropolarimeter). NIRIS will offer unprecedented high resolution
spectroscopic and polarimetric imaging data of the solar atmosphere
from the deepest photosphere through the base of the corona. With the
aid of the BBSO adaptive optics (AO) system, the spatial resolution
will be close to the diffraction limit of the NST. The spectroscopic
cadence will reach one second, while polarimetric measurements,
including Stokes I, Q, U, V profiles, remain at a better than
10 s cadence. Polarization sensitivity is expected to be reach
∼ 10–4Ic. NIRIS will cover a broad spectral range from 1.0 to
1.7μm, with particular attention to two unique spectral lines:
the Fe I 1565 nm doublet has already proven to be the most sensitive
to Zeeman effect for probing the magnetic field in the deepest
photosphere; the He I 1083 nm multiplet is one of the best currently
available diagnostic of upper chromospheric magnetic fields that
allows one to map the vector field at the base of the corona. NIRIS
will be built on dual Fabry-Pérot Interferometers (FPIs), each of
which has an aperture of 100 mm. The larger aperture of FPIs allows
the available field-of-view up to one and half minutes with a spectral
power of ∼ 105. |
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