Luc Rouppe van der Voort: "Pushing the limits in ground-based solar observations"

Fredagskollokvium

Abstract

 

In recent years, it has been shown that the combination of adaptive optics and image processing is an effective way to obtain high quality solar observations for extended periods of time. Image restoration techniques benefit from a large number of exposures to determine a unique solution for the restored image and the disturbing effects of seeing. At the Swedish 1-m Solar Telescope on La Palma, this is pushed to the extreme by the use of a set of high quality, low noise, CCD cameras that are capable of running at 40 frames per second with 15 ms exposure time. Not only provides this high frame rate ample images for successful restorations, it also boosts signal-to-noise in for example polarimetry. Another application is Halpha imaging for which the short evolution times of chromospheric processes demand a much shorter data acquisition time than what is applicable for the photosphere. The high frame rate enabled us to obtain high quality Halpha time series which revealed highly dynamic chromospheric phenomena with speeds of more than 200 km/s. At ITA, we have a 90 CPU cluster dedicated to SST data processing which enables us to manage large volumes of data within a reasonable time frame. I will present an overview of the unique data obtained during the last few observing campaigns.

Publisert 12. aug. 2009 09:33 - Sist endret 15. juni 2011 13:49