Phase-diversity techniques provide a novel observational method for overcoming the effects of turbulence and instrument-induced aberrations in ground-based astronomy. Two implementations of phase-diversity techniques that differ with regard to noise …
We present a method to obtain diffraction limited spectrograms of extended sources from a series of ground-based slit- spectrograms. The method is a combination of speckle deconvolution (Keller & von der Luehe 1992) and a rapid spectrograph …
Review of high-spatial-resolution observations of solar magnetic fields.
We present applications of a recently developed iterative blind deconvolution algorithm to both simulated and real data. The applications demonstrate the algorithm's performance for a wide range of astronomical imaging. We demonstrate the …
Magnetic flux at the surface of the Sun is predominantly concentrated in discrete areas with kilogauss field strengths. Except for sunspots, these areas are too small to have been resolved by conventional observations. These magnetic flux tubes are …