Polarization Calibration of the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO)

By J. Schou, J. M. Borrero, A. Norton, Steven Tomczyk, David F. Elmore, G. Card. 2012

136 citations recorded by the source corpus.

As part of the overall ground-based calibration of the Helioseismic and Magnetic Imager (HMI) instrument an extensive set of polarimetric calibrations were performed. This paper describes the polarimetric design of the instrument, the test setup, the polarimetric model, the tests performed, and some results. It is demonstrated that HMI achieves an accuracy of 1% or better on the crosstalks between Q, U, and V and that our model can reproduce the intensities in our calibration sequences to about 0.4%. The amount of depolarization is negligible when the instrument is operated as intended which, combined with the flexibility of the polarimeter design, means that the polarimetric efficiency is excellent.

Subfields: Astronomy and Astrophysics, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/13249fa338d49edda0852b83ff70cd400cdcf14f

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In Astronomy and Astrophysics

1. Monica G. Bobra
2. T. Wiegelmann
3. C. Schrijver
4. S. Couvidat
5. S. Solanki
6. J. Todd Hoeksema
7. Yang Liu
8. G. Barnes

In Molecular Biology

1. Monica G. Bobra
2. S. Couvidat
3. J. Todd Hoeksema
4. C. Schrijver
5. Xudong Sun
6. Yang Liu
7. T. Wiegelmann
8. G. Barnes

Citations in the corpus

• The Helioseismic and Magnetic Imager (HMI) Investigation for the Solar Dynamics Observatory (SDO) (2012, methodology): “, 2011), the instrumental polarization calibration (Schou et al., 2010), the vector-field inversion technique (Borrero et al.”
• Design and Ground Calibration of the Helioseismic and Magnetic Imager (HMI) Instrument on the Solar Dynamics Observatory (SDO) (2012, methodology): “The details of this effort are described in Schou et al. (2010). For the polarization tests, a Polarization Calibration Unit (PCU), described by Schou”
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs – Space-Weather HMI Active Region Patches (2014, background): “For example, Schrijver (2007) defined a parameter [R] that measures the flux contribution surrounding polarity-inversion lines.”
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Overview and Performance (2014, methodology): “This paper focuses primarily on the analysis of data from a second, identical “Vector” camera that measures linear and circular polarization with a 135 s cadence frame list (Schou et al., 2012b).”
• The Polarimetric and Helioseismic Imager on Solar Orbiter (2019, methodology): “Co-ordinated observations at the correct phase of its orbit by SO/PHI and by an instrument in the Sun-Earth line observing at the same wavelength (e.g. SDO/HMI) will give direct measurements of photospheric height differences.”