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- Solar_transition_region abstract "The solar transition region is a region of the Sun's atmosphere, between the chromosphere and corona.It is visible from space using telescopes that can sense ultraviolet. It is important because it is the site of several unrelated but important transitions in the physics of the solar atmosphere: Below, gravity tends to dominate the shape of most features, so that the Sun may often be described in terms of layers and horizontal features (like sunspots); above, dynamic forces dominate the shape of most features, so that the transition region itself is not a well-defined layer at a particular altitude. Below, most of the helium is not fully ionized, so that it radiates energy very effectively; above, it becomes fully ionized. This has a profound effect on the equilibrium temperature (see below). Below, the material is opaque to the particular colors associated with spectral lines, so that most spectral lines formed below the transition region are absorption lines in infrared, visible light, and near ultraviolet, while most lines formed at or above the transition region are emission lines in the far ultraviolet (FUV) and X-rays. This makes radiative transfer of energy within the transition region very complicated. Below, gas pressure and fluid dynamics usually dominate the motion and shape of structures; above, magnetic forces dominate the motion and shape of structures, giving rise to different simplifications of magnetohydrodynamics. The transition region itself is not well studied in part because of the computational cost, uniqueness, and complexity of Navier-Stokes combined with electrodynamics.Helium ionization is important because it is a critical part of the formation of the corona: when solar material is cool enough that the helium within it is only partially ionized (i.e. retains one of its two electrons), the material cools by radiation very effectively via both black body radiation and direct coupling to the helium Lyman continuum. This condition holds at the top of the chromosphere, where the equilibrium temperature is a few tens of thousands of kelvins.Applying slightly more heat causes the helium to ionize fully, at which point it ceases to couple well to the Lyman continuum and does not radiate nearly as effectively. The temperature jumps up rapidly to nearly one million kelvin, the temperature of the solar corona. This phenomenon is called the temperature catastrophe and is a phase transition analogous to boiling water to make steam; in fact, solar physicists refer to the process as evaporation by analogy to the more familiar process with water. Likewise, if the amount of heat being applied to coronal material is slightly reduced, the material very rapidly cools down past the temperature catastrope to around one hundred thousand kelvin, and is said to have condensed. The transition region consists of material at or around this temperature catastrophe.The transition region is visible in far-ultraviolet (FUV) images from the TRACE spacecraft, as a faint nimbus above the dark (in FUV) surface of the Sun and the corona. The nimbus also surrounds FUV-dark features such as solar prominences, which consist of condensed material that is suspended at coronal altitudes by the magnetic field.".
- Solar_transition_region thumbnail Transition-region.jpg?width=300.
- Solar_transition_region wikiPageExternalLink transitionregion.
- Solar_transition_region wikiPageExternalLink transitiontemp.
- Solar_transition_region wikiPageID "4173095".
- Solar_transition_region wikiPageLength "4942".
- Solar_transition_region wikiPageOutDegree "42".
- Solar_transition_region wikiPageRevisionID "686084548".
- Solar_transition_region wikiPageWikiLink Black-body_radiation.
- Solar_transition_region wikiPageWikiLink Boiling.
- Solar_transition_region wikiPageWikiLink Category:Light_sources.
- Solar_transition_region wikiPageWikiLink Category:Plasma_physics.
- Solar_transition_region wikiPageWikiLink Category:Space_plasmas.
- Solar_transition_region wikiPageWikiLink Category:Sun.
- Solar_transition_region wikiPageWikiLink Chromosphere.
- Solar_transition_region wikiPageWikiLink Classical_electromagnetism.
- Solar_transition_region wikiPageWikiLink Corona.
- Solar_transition_region wikiPageWikiLink Coronal_hole.
- Solar_transition_region wikiPageWikiLink Electron.
- Solar_transition_region wikiPageWikiLink Fluid_dynamics.
- Solar_transition_region wikiPageWikiLink Infrared.
- Solar_transition_region wikiPageWikiLink Ionization.
- Solar_transition_region wikiPageWikiLink Kelvin.
- Solar_transition_region wikiPageWikiLink Light.
- Solar_transition_region wikiPageWikiLink Lyman_series.
- Solar_transition_region wikiPageWikiLink Magnetism.
- Solar_transition_region wikiPageWikiLink Magnetohydrodynamics.
- Solar_transition_region wikiPageWikiLink Moreton_wave.
- Solar_transition_region wikiPageWikiLink Navier–Stokes_equations.
- Solar_transition_region wikiPageWikiLink Outer_space.
- Solar_transition_region wikiPageWikiLink Phase_transition.
- Solar_transition_region wikiPageWikiLink Pressure.
- Solar_transition_region wikiPageWikiLink Radiative_transfer.
- Solar_transition_region wikiPageWikiLink Solar_physics.
- Solar_transition_region wikiPageWikiLink Solar_prominence.
- Solar_transition_region wikiPageWikiLink Spectral_line.
- Solar_transition_region wikiPageWikiLink Spicule_(solar_physics).
- Solar_transition_region wikiPageWikiLink Steam.
- Solar_transition_region wikiPageWikiLink Sun.
- Solar_transition_region wikiPageWikiLink TRACE.
- Solar_transition_region wikiPageWikiLink Ultraviolet.
- Solar_transition_region wikiPageWikiLink Water.
- Solar_transition_region wikiPageWikiLink X-ray.
- Solar_transition_region wikiPageWikiLink File:Transition-region.jpg.
- Solar_transition_region wikiPageWikiLinkText "Solar transition region".
- Solar_transition_region wikiPageWikiLinkText "Transition region".
- Solar_transition_region wikiPageWikiLinkText "energy transport".
- Solar_transition_region wikiPageWikiLinkText "solar transition region".
- Solar_transition_region wikiPageWikiLinkText "transition layer".
- Solar_transition_region wikiPageWikiLinkText "transition region".
- Solar_transition_region wikiPageUsesTemplate Template:Refimprove.
- Solar_transition_region wikiPageUsesTemplate Template:Reflist.
- Solar_transition_region wikiPageUsesTemplate Template:The_Sun.
- Solar_transition_region subject Category:Light_sources.
- Solar_transition_region subject Category:Plasma_physics.
- Solar_transition_region subject Category:Space_plasmas.
- Solar_transition_region subject Category:Sun.
- Solar_transition_region hypernym Region.
- Solar_transition_region type Settlement.
- Solar_transition_region type Astrophysic.
- Solar_transition_region type Physic.
- Solar_transition_region type Plasma.
- Solar_transition_region type Source.
- Solar_transition_region comment "The solar transition region is a region of the Sun's atmosphere, between the chromosphere and corona.It is visible from space using telescopes that can sense ultraviolet.".
- Solar_transition_region label "Solar transition region".
- Solar_transition_region sameAs Q128118.
- Solar_transition_region sameAs منطقة_الانتقال_الشمسي.
- Solar_transition_region sameAs Regió_de_transició_solar.
- Solar_transition_region sameAs Přechodová_oblast.
- Solar_transition_region sameAs Région_de_transition_solaire.
- Solar_transition_region sameAs Zona_di_transizione.
- Solar_transition_region sameAs 遷移層.
- Solar_transition_region sameAs 천이영역.
- Solar_transition_region sameAs Solens_overgangsregion.
- Solar_transition_region sameAs Warstwa_przejściowa.
- Solar_transition_region sameAs Região_de_transição_solar.
- Solar_transition_region sameAs m.0bn2nb.
- Solar_transition_region sameAs Regiunea_de_tranziție.
- Solar_transition_region sameAs Prechodová_oblasť.
- Solar_transition_region sameAs Tranziciona_zona.
- Solar_transition_region sameAs Q128118.
- Solar_transition_region sameAs 過渡區.
- Solar_transition_region wasDerivedFrom Solar_transition_region?oldid=686084548.
- Solar_transition_region depiction Transition-region.jpg.
- Solar_transition_region isPrimaryTopicOf Solar_transition_region.