EUV monitor

This module is aimed at providing quasi real-time monitoring and identification of features on the Sun of potential interest for Space Weather effects.

The input data are EUV images and photospheric field maps acquired by the AIA and HMI instruments on-board SDO and analyzed in quasi real-time.

The EUV images (193 Å filter) are first corrected for limb brightening effect, coaligned with the HMI images (after removal of noisy pixels near the solar limb), and converted in spherical coordinates. Then, by employing a fuzzy clustering algorithm, the images are analyzed to determine pixel-by-pixel a "membership probability" to one of the following four clusters: "active region" (red), "quiet sun" (yellow), "mid-latitude coronal hole" (blue), and "high-latitude coronal hole" (purple). The module provides in output a 2D image of the Sun clusterized with different colors encoding the membership of each pixel to the cluster with higher probability.