Soft shadows provide important information to viewers about spatial relationships between objects. Generating accurate soft shadows in real time has been a focus of research in computer graphics. Shadow mapping is a standard way of generating hard shadows in real time and several methods including Smoothies [Chan and Durand 2003] and penumbra maps [Wyman and Hansen 2003] extend the standard sha...

A new robust technique is presented for automated identification of sunspots on full-disk white-light (WL) solar images obtained from SOHO/MDI instrument and Ca II K1 line images from the Meudon Observatory. Edge-detection methods are applied to find sunspot candidates followed by local thresholding using statistical properties of the region around sunspots. Possible initial oversegmentation of...

— This paper describes an efficient algorithm to model the light attenuation due to a participating media with low albedo. Here, we consider the light attenuation along a ray, as well as the light attenuation emanating from a surface. The light attenuation is modeled using a splatting volume renderer for both the viewer and the light source. During the rendering, a 2D shadow buffer accumulates ...

The analysis of a 4 1/2 hour series of high resolution white light observations of the umbra in a medium-size sunspot (NOAA 7519, observed on 5 June 1993 at the Swedish Vacuum Solar Telescope, La Palma) is described. An automatic identification and tracking algorithmwas applied to umbral dots (UDs) observed in a destretched movie of 360 frames. In total, 662 UDs were tracked and their filling f...

Abstract In this study, we investigate the spatial distribution of highly varying plasma composition around one largest sunspots solar cycle 24. Observations photosphere, chromosphere, and corona are brought together with magnetic field modeling sunspot in order to probe conditions that regulate degree fractionation within loop populations differing connectivities. We find that, coronal above u...

Seven cymothoid species are identified in parasitological studies conducted the Dardanelles Strait between May 2018- 2020. The Cymothoids as follows: Mothocya epimerica Costa, 1851, Nerocila bivittata (Risso, 1816), Anilocra frontalis H. Milne Edwards, 1840, Ceratothoa oestroides 1826), parallela (Otto, 1828), italica Schiödte & Meinert, 1883, Emetha audouini (H. 1840). A. and C. found ...

Novel spectro-polarimetric observations of the He I multiplet are used to explore the dynamics of the chromospheric oscillation above sunspot umbrae. The results presented here provide strong evidence in support of the two-component model proposed by Socas-Navarro et al. According to this model, the waves propagate only inside channels of sub-arcsecond width (the “active” component), whereas th...

We demonstrate that for weak flares the dependence on spottedness can be rather weak. The fact is such occur both in small and large active regions. At same time, powerful of classes M X much more often In energy estimates, mean magnetic field starspots also assumed equal to sunspot umbra. So effective 900 Mx/cm$^2$ sunspots 2000 starspots. Moreover, height storage cannot strictly proportional ...