IFTSUV: an imaging Fourier transform spectrometer in UV for the next solar space missions

Millard, Anne; Lemaire, Philippe; Vial, J. C.

doi:10.1117/12.672182

Cited by 2 publications

(2 citation statements)

References 38 publications

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“…The LYOT project is a Lα coronagraph combined with a Lα disk imager (see Vial et al 2002;Millard et al 2006;and Vial et al 2008). In addition, it is planned to implement a simple polarizer system.…”

Section: The Lyot Projectmentioning

confidence: 99%

Hanle signatures of the coronal magnetic field in the linear polarization of the hydrogen Lαline

Derouich

Auchère

Vial

et al. 2010

A&A

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Aims. This paper is dedicated to the assessment of the validity of future coronal spectro-polarimetric observations and to prepare their interpretation in terms of the magnetic field vector. Methods. We assume that the polarization of the hydrogen coronal Lα line is due to anisotropic scattering of an incident chromospheric radiation field. The anisotropy is due to geometrical effects but also to the inhomogeneities of the chromospheric regions which we model by using Carrington maps of the Lα. Because the corona is optically thin, we fully consider the effects of the integration over the line-of-sight (LOS). As a modeling case, we include a dipolar magnetic topology perturbed by a non-dipolar magnetic structure arising from a prominence current sheet in the corona. The spatial variation of the hydrogen density and the temperature is taken into account. We determine the incident radiation field developed on the tensorial basis at each point along the LOS. Then, we calculate the local emissivity vector to obtain integrated Stokes parameters with and without coronal magnetic field. Results. We show that the Hanle effect is an interesting technique for interpreting the scattering polarization of the Lα λ1216 line in order to diagnose the coronal magnetic field. The difference between the calculated polarization and the zero magnetic field polarization gives us an estimation of the needed polarimetric sensitivity in future polarization observations. We also obtain useful indications about the optimal observational strategy. Conclusions. Quantitative interpretation of the Hanle effect on the scattering linear polarization of Lα line can be a crucial source of information about the coronal magnetic field at a height over the limb h < 0.7 R . Therefore, one needs the development of spatial instrumentation to observe this line.

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Section: The Lyot Projectmentioning

confidence: 99%

Hanle signatures of the coronal magnetic field in the linear polarization of the hydrogen Lαline

Derouich

Auchère

Vial

et al. 2010

A&A

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“…A first mock-up of IFTSUV has been designed and built at IAS. 30 It validated the working principle in the visible light and revealed the strong technical constraints for the UV spectral domain. The main difficulties in the realization of the mock-up were the lack of alignment control which led to noisy and poorly contrasted spectra.…”

Section: Discussionmentioning

confidence: 90%

Definition of an imaging spectrometer meeting the needs of UV solar physics

Galarreta

Philippon

Vial

et al. 2010

Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray

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The study of the outer solar atmosphere requires combining imaging and spectroscopy in the UV lines formed in the high chromosphere, the transition region and the corona. We start from the science requirements and we define the instrumental specifications in terms of field-of-view (FOV), spatial, temporal and spectral resolution and bandpass. We propose two different all-reflection optical architectures based on interferometric techniques: Spatial Heterodyne Spectroscopy (SHS); and Imaging Transform Spectrometer (IFTS). We describe the different set-ups and compare the potential performances of the two types of solutions, and discuss their feasibility. We conclude that IFTS appears to be the best solution, meeting the needs of UV solar physics. However, we point out the many difficulties to be encountered, especially as far as metrology is concerned.

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IFTSUV: an imaging Fourier transform spectrometer in UV for the next solar space missions

Cited by 2 publications

References 38 publications

Hanle signatures of the coronal magnetic field in the linear polarization of the hydrogen Lαline

Hanle signatures of the coronal magnetic field in the linear polarization of the hydrogen Lαline

Definition of an imaging spectrometer meeting the needs of UV solar physics

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