Luc H. M. Rouppe van der Voort

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Recently a second type of spicules was discovered at the solar limb with the Solar Optical Telescope (SOT) onboard the Japanese Hinode spacecraft. These previously unrecognized type II spicules are thin chromospheric jets that are shorter-lived (10–60 s) and that show much higher apparent upward velocities (of order 50–100 km s −1) than the classical(More)
We present examples of the application of the image restoration method of Multi-Object Multi-Frame Blind Deconvolution to observations obtained with the Swedish 1-m Solar Telescope on La Palma. This restoration method is an extension of Joint Phase Diverse Speckle image restoration. Multiple realizations of multiple objects can now be restored jointly,(More)
High-resolution time series of sunspots have been obtained with the Swedish 1m Solar Telescope between 2003 and 2006 at different locations on the solar disc. Proper motions in seven different active regions have been studied. The analysis has been done by applying local correlation tracking to every series of sunspots, each of them more than 40 minutes(More)
We have obtained high-resolution spectrograms of small-scale magnetic structures with the Swedish 1-m Solar Telescope. We present Doppler measurements at 0.2 00 spatial resolution of bright points, ribbons, and flowers, and their immediate surroundings, in the C i k5380.3 line (formed in the deep photosphere) and the two Fe i lines at 5379.6 and 5386.3 8.(More)
With the recent advent of the Swedish 1-m Solar Telescope (SST), advanced image processing techniques, as well as numerical simulations that provide a more realistic view of the chromosphere, a comprehensive understanding of chromospheric jets such as spicules, mottles and fibrils is now within reach. In this paper, we briefly summarize results from a(More)
Context. For many years, there seemed to be significant differences between the continuum intensity distributions derived from observations and simulations of the solar photosphere. Aims. In order to settle the discussion on these apparent discrepancies, we present a detailed comparison between simulations and seeing-free observations that takes into(More)
We analyse sunspot filtergrams of unprecedented quality obtained by Scharmer et al. (2002) with the Swedish 1-m Solar Telescope on La Palma. The observations comprise images in three different wavelength bands: 488, 436, and 430 nm (G-band). We find that there are still unresolved penumbral filaments which must have widths smaller than 80 km. The fine(More)
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