Data reduction and analysis of Solar Dopplergrams

Helioseismology studies requires the acquisition and analysis of sequence of line-of-sight velocity fields of the solar atmosphere. To obtain such velocity maps of the full solar disk a doppler shift analysis of the emitted photons is performed. Such velocity fields are commonly indicated as dopplergram. It is necessary to correctly correlate each pixel position corresponding to the same piece of the solar atmosphere evolving in time. Such time series analysis require a software procedure to aline acquired raw images that may be different in size and position. In this presentation we show how we perform such data reduction using ad hoc software, that in some cases require an human interaction for validation to prevent the lost of single images geometric characteristic. Almost all the images geometric characteristic are automatically identified by our registration code. Due to the optional human intervention we classify this software as a graphical interface for solar data post processing.