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The umbra (Latin for "shadow") is the innermost and darkest part of a shadow, where the light source is completely blocked by the occluding body. An observer within the umbra experiences a total occultation. The umbra of a round body occluding a round light source forms a right circular cone.
Due to the colour range available for different types of cosmetic products, an ombré effect can be achieved by blending two or more shades together on the eyes, lips, [14] or cheeks. [15]
20 lip 2020 · Umbral chromospheric oscillations exhibit substantial differences from their photospheric counterparts. They show an enhanced power and a shorter dominant period, from waves with amplitudes of a...
29 maj 2024 · Umbral flashes are the periodic brightening phenomenon of about 3 minutes in the chromospheric umbra (Beckers and Tallant, 1969), caused by the steepening of upward-propagating magnetoacoustic waves into shocks (Tian et al., 2014; Henriques et al., 2015).
2 gru 2019 · The cores of the umbrae display the largest resonance cavity depths, often with geometric heights on the order of 2,300 km. An image of the Earth is added to provide a sense of scale.
The darkest area of a sunspot (also the first to be observed) is called the umbrae. As the sunspot matures (becomes more intense), a less dark, outlying area of well-defined fibril-like structure develops around the umbrae - called penumbra.
26 kwi 2019 · Stangalini et al. (2012) found a three-minute wave enhancement in the photosphere of a pore, whose amplitude increases with the magnetic field strength. In this paper, we numerically investigate wave propagation in sunspot umbrae.
