Simulation and analysis of VIM measurements: feedback on design parameters

Details Simulation and analysis of VIM measurements: feedback on design parameters Simulation and analysis of VIM measurements: feedback on design parameters

2006-11-14

arxiv.org/abs/astro-ph/0611443v1

Astronomy and Astrophysics

Astrophysics

6 pages, 7 figures. Submitted to the proceedings of the conference "The Second Solar Orbiter Workshop", 2006 October 16-20, At

Scientific paper

The Visible-light Imager and Magnetograph (VIM) proposed for the ESA Solar Orbiter mission will observe a photospheric spectral line at high spatial resolution. Here we simulate and interpret VIM measurements. Realistic MHD models are used to synthesize "observed" Stokes profiles of the photospheric Fe I 617.3 nm line. The profiles are degraded by telescope diffraction and detector pixel size to a spatial resolution of 162 km on the solar surface. We study the influence of spectral resolving power, noise, and limited wavelength sampling on the vector magnetic fields and line-of-sight velocities derived from Milne-Eddington inversions of the simulated measurements. VIM will provide reasonably accurate values of the atmospheric parameters even with filter widths of 120 mA and 3 wavelength positions plus continuum, as long as the noise level is kept below 10^-3 I_c.

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