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- Q6311 subject Q7033720.
- Q6311 abstract "The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone. It is divided into several regions of distinct character: The photosphere, which is the atmosphere's lowest and coolest layer, is normally its only visible part. Light escaping from the surface of the star stems from this region and passes through the higher layers. The Sun's photosphere has a temperature in the 5,770 K to 5,780 K range. Starspots, cool regions of disrupted magnetic field lie on the photosphere. Above the photosphere lies the chromosphere. This part of the atmosphere first cools down and then starts to heat up to about 10 times the temperature of the photosphere. Above the chromosphere lies the transition region, where the temperature increases rapidly on a distance of only around 100 km. The outermost part of the stellar atmosphere is the corona, a tenuous plasma which has a temperature above one million Kelvin. While all stars on the main sequence feature transition regions and coronae, not all evolved stars do so. It seems that only some giants, and very few supergiants, possess coronae. An unresolved problem in stellar astrophysics is how the corona can be heated to such high temperatures. The answer lies in magnetic fields, but the exact mechanism remains unclear.During a total solar eclipse, the photosphere of the Sun is obscured, revealing its atmosphere's other layers. Observed during eclipse, the sun's chromosphere appears (briefly) as a thin pinkish arc, and its corona is seen as a tufted halo. The same phenomenon in eclipsing binaries can make the chromosphere of giant stars visible.".
- Q6311 thumbnail Solar_eclipse_1999_4_NR.jpg?width=300.
- Q6311 wikiPageWikiLink Q10251.
- Q6311 wikiPageWikiLink Q11408.
- Q6311 wikiPageWikiLink Q11579.
- Q6311 wikiPageWikiLink Q127922.
- Q6311 wikiPageWikiLink Q128034.
- Q6311 wikiPageWikiLink Q128118.
- Q6311 wikiPageWikiLink Q147572.
- Q6311 wikiPageWikiLink Q170754.
- Q6311 wikiPageWikiLink Q186310.
- Q6311 wikiPageWikiLink Q1893536.
- Q6311 wikiPageWikiLink Q190003.
- Q6311 wikiPageWikiLink Q193599.
- Q6311 wikiPageWikiLink Q202746.
- Q6311 wikiPageWikiLink Q234909.
- Q6311 wikiPageWikiLink Q3450.
- Q6311 wikiPageWikiLink Q37547.
- Q6311 wikiPageWikiLink Q3887.
- Q6311 wikiPageWikiLink Q50053.
- Q6311 wikiPageWikiLink Q523.
- Q6311 wikiPageWikiLink Q525.
- Q6311 wikiPageWikiLink Q5875.
- Q6311 wikiPageWikiLink Q619448.
- Q6311 wikiPageWikiLink Q6372.
- Q6311 wikiPageWikiLink Q6472.
- Q6311 wikiPageWikiLink Q7033720.
- Q6311 wikiPageWikiLink Q854050.
- Q6311 wikiPageWikiLink Q9128.
- Q6311 type Place.
- Q6311 type CelestialBody.
- Q6311 type Location.
- Q6311 type Place.
- Q6311 type Star.
- Q6311 type Thing.
- Q6311 comment "The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone. It is divided into several regions of distinct character: The photosphere, which is the atmosphere's lowest and coolest layer, is normally its only visible part. Light escaping from the surface of the star stems from this region and passes through the higher layers. The Sun's photosphere has a temperature in the 5,770 K to 5,780 K range.".
- Q6311 label "Stellar atmosphere".
- Q6311 depiction Solar_eclipse_1999_4_NR.jpg.