Left: angular frequency (uv) coverage provided by the 30 STIX Fourier components. The corresponding point response function, is shown over a 360 × 360 arcsec FOV (top center) and as profiles along the x and y axes (top right) with equal (natural) weighting of all 30 visibilities which yields a FWHM beam of ∼19 arcsec (black profile). Alternative weighting choices provide the post-facto ability to trade imaging dynamic range for higher angular resolution in the point response function. For “uniform” weighting (proportional to spatial frequency), the FWHM becomes 11 arcsec (bottom center and right). The imaging FOV can be selected post-facto anywhere on the Sun.
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