Fast vector magnetographs: THEMIS/MSDP and EST project
Résumé
Imaging spectro-polarimetry with Multichannel Subtractive Double Pass (MSDP) is able to provide vector magnetic fields with high temporal resolution. We present some results obtained with THEMIS and reduced with the UNNOFIT code, as well as a new method to achieve off-line the required spectral resolution. Performances of slit- and imaging-spectroscopy are briefly compared, together with the high capabilities expected from the EST project.