Search results
Results from the WOW.Com Content Network
They affect all layers of the solar atmosphere (photosphere, chromosphere, and corona). [2] The plasma medium is heated to >10 7 kelvin, while electrons, protons, and heavier ions are accelerated to near the speed of light. [3] [4] Flares emit electromagnetic radiation across the electromagnetic spectrum, from radio waves to gamma rays. [2]
The red color of the chromosphere could be seen during the solar eclipse of August 11, 1999.. The density of the Sun's chromosphere decreases exponentially with distance from the center of the Sun by a factor of roughly 10 million, from about 2 × 10 −4 kg/m 3 at the chromosphere's inner boundary to under 1.6 × 10 −11 kg/m 3 at the outer boundary. [5]
The Sun's atmosphere is composed of five layers: the photosphere, the chromosphere, the transition region, the corona, and the heliosphere. The coolest layer of the Sun is a temperature minimum region extending to about 500 km above the photosphere, and has a temperature of about 4,100 K . [ 76 ]
The photosphere is a star's outer shell from which light is radiated. It extends into a star's surface until the plasma becomes opaque, equivalent to an optical depth of approximately ⁄, [1] or equivalently, a depth from which 50% of light will escape without being scattered. A photosphere is the region of a luminous object, usually a star ...
The umbra is the darker inner circle and the penumbra is the lighter ring around the umbra. In astronomy, the Wilson effect is the perceived depression of a sunspot 's umbra, or center, in the Sun 's photosphere. The magnitude of the depression for the umbra is between 500 and 1000 km, with an average of 600 km. [1]
A corona (pl.: coronas or coronae) is the outermost layer of a star 's atmosphere. It is a hot but relatively dim region of plasma populated by intermittent coronal structures known as solar prominences or filaments. The Sun 's corona lies above the chromosphere and extends millions of kilometres into outer space.
Solar prominence. Solar prominence seen in true color during totality of a solar eclipse. In solar physics, a prominence, sometimes referred to as a filament, [a] is a large plasma and magnetic field structure extending outward from the Sun 's surface, often in a loop shape. Prominences are anchored to the Sun's surface in the much brighter ...
Solar core. The core of the Sun is considered to extend from the center to about 0.2 of the solar radius (139,000 km; 86,000 mi). [1] It is the hottest part of the Sun and of the Solar System. It has a density of 150,000 kg/m 3 (150 g/cm 3) at the center, and a temperature of 15 million kelvins (15 million degrees Celsius; 27 million degrees ...