Increasing the Fine Structure Visibility of the Hinode SOT Ca II H Filtergrams

Abstract

We present the improved so-called Madmax (OMC) operator selecting maxima of convexities computed in multiple directions around each pixel rewritten in MatLab and shown to be very efficient for pattern recognition. The aim of the algorithm is to trace the bright hair-like features (for ex. chromospheric thin jets or spicules) of solar ultimate observations polluted by a noise of different origins. This popular spatial operator uses the second derivative in the optimally selected direction for which its absolute value has a maximum value. Accordingly, it uses the positivity of the resulting intensity signal affected by a superposed noise. The results are illustrated using a test artificially generated image and real SOT (Hinode) images are also used, to make your own choice of the sensitive parameters to use in improving the visibility of images.

12 pages, 3 figurs, submitted in Solar Physics

References in corpus (3)

• The Solar Optical Telescope for the Hinode Mission: An Overview
• A Statistical Analysis of the SOT-Hinode Observations of Solar Spicules and their Wave-like Behavior
• Spicule Dynamics over Plage Region

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• Spicules Intensity Oscillations in SOT/HINODE Observations
• Improved SOT (Hinode mission) high resolution solar imaging observations
• Polar Coronal Plumes as Tornado-Like Jets
• Evidence for coherent spicule oscillations by correcting Hinode/SOT Ca II H in the southeast limb of the Sun
• Observation of galactic cosmic ray spallation events from the SoHO mission 20-Year operation of LASCO