Solar polarimetry through the K i lines at 770 nm

Abstract Polarimetry is a crucial method to investigate solar magnetic elds. From the viewpoint of space weather, the magnetic eld in solar laments, which occasionally erupt and develop into interplanetary ux ropes, is of particular interest. To measure the magnetic eld in laments, high-performance polarimetry in the near-infrared wavelengths employing a high-speed, large-format detector is required; however, so far, this has been difficult to be realized. Thus, the development of a new infrared camera for advanced solar polarimetry has been started, employing a HAWAII-2RG (H2RG) array by Teledyne, which has 2048 2048 pixels, focusing on the wavelengths in the range of 1.0{1.6 m. We solved the problem of the difficult operation of the H2RGs under \fast readout mode" synchronizing with high-speed polarization modulation by introducing a \MACIE" (Markury ASIC Control and Interface Electronics) interface card and new assembly codes provided by Markury Scientic. This enables polarization measurements with high frame-rates, such as 29{117 frames per seconds, using a H2RG. We conducted experimental observations of the Sun and conrmed the high polarimetric performance of the camera.

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Solar polarimetry close to the diffraction limit

10.1117/12.459286 ◽

2003 ◽

Cited By ~ 5

Author(s):

Christoph U. Keller

Keyword(s):

Diffraction Limit ◽

Solar Polarimetry

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A HAWAII-2RG infrared camera operated under fast readout mode for solar polarimetry

Earth Planets and Space ◽

10.1186/s40623-020-01318-8 ◽

2020 ◽

Vol 72 (1) ◽

Author(s):

Yoichiro Hanaoka ◽

Yukio Katsukawa ◽

Satoshi Morita ◽

Yukiko Kamata ◽

Noriyoshi Ishizuka

Keyword(s):

Magnetic Field ◽

High Speed ◽

High Performance ◽

Near Infrared ◽

Infrared Camera ◽

Solar Magnetic Fields ◽

Solar Filaments ◽

Infrared Wavelengths ◽

Solar Polarimetry ◽

The Magnetic Field

AbstractPolarimetry is a crucial method to investigate solar magnetic fields. From the viewpoint of space weather, the magnetic field in solar filaments, which occasionally erupt and develop into interplanetary flux ropes, is of particular interest. To measure the magnetic field in filaments, high-performance polarimetry in the near-infrared wavelengths employing a high-speed, large-format detector is required; however, so far, this has been difficult to be realized. Thus, the development of a new infrared camera for advanced solar polarimetry has been started, employing a HAWAII-2RG (H2RG) array by Teledyne, which has $$2048~\times 2048$$ 2048 × 2048 pixels, focusing on the wavelengths in the range of $$1.0\;{-}\;1.6\;~\mu {\text{m}} $$ 1.0 - 1.6 μ m . We solved the problem of the difficult operation of the H2RGs under “fast readout mode” synchronizing with high-speed polarization modulation by introducing a “MACIE” (Markury ASIC Control and Interface Electronics) interface card and new assembly codes provided by Markury Scientific. This enables polarization measurements with high frame-rates, such as 29–117 frames per seconds, using a H2RG. We conducted experimental observations of the Sun and confirmed the high polarimetric performance of the camera.

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