53 citations · 569 across the 34 of their papers we have counts for
4 papers · 1 filter
Sunspot splitting triggering an eruptive flare
Rohan E. Louis, Klaus G. Puschmann, Bernhard Kliem +2
We investigate how the splitting of the leading sunspot and associated flux emergence and cancellation in active region NOAA 11515 caused an eruptive M5.6 flare on 2012 July 2. Our…
The association between sunspot magnetic fields and superpenumbral fibrils
Rohan E. Louis, Horst Balthasar, Christoph Kuckein +3
Spectropolarimetric observations of a sunspot were carried out with the Tenerife Infrared Polarimeter at Observatorio del Teide, Tenerife, Spain. Maps of the physical parameters we…
Formation of a penumbra in a decaying sunspot
Rohan E. Louis, Shibu K. Mathew, Klaus G. Puschmann +2
Context : Penumbrae are an important characteristic of sunspots, whose formation is intricately related to the nature of sub-photospheric magnetic fields. Aims : We study the forma…
The GREGOR Fabry-Pérot Interferometer and its companion the Blue Imaging Solar Spectrometer
Klaus G. Puschmann, Carsten Denker, Horst Balthasar +6
The GREGOR Fabry-Pérot Interferometer (GFPI) is one of three first-light instruments of the German 1.5-meter GREGOR solar telescope at the Observatorio del Teide, Tenerife, Spain.…