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• Polarization_in_astronomy abstract "Polarization is an important phenomenon in astronomy. The polarization of starlight was first observed by the astronomers William Hiltner and John S. Hall in 1949. Subsequently, Jesse Greenstein and Leverett Davis, Jr. developed theories allowing the use of polarization data to trace interstellar magnetic fields. Though the integrated thermal radiation of stars is not usually appreciably polarized at source, scattering by interstellar dust can impose polarization on starlight over long distances. Net polarization at the source can occur if the photosphere itself is asymmetric, due to limb polarization. Plane polarization of starlight generated at the star itself is observed for Ap stars (peculiar A type stars).[1]Both circular and linear polarization of light from the Sun has been measured. Circular polarization is mainly due to transmission and absorption effects in strongly magnetic regions of the Sun's surface. Another mechanism that gives rise to circular polarization is the so-called alignment-to-orientation mechanism. Continuum light is linearly polarized at different locations across the face of the Sun (limb polarization) though taken as a whole, this polarization cancels. Linear polarization in spectral lines is usually created by anisotropic scattering of photons on atoms and ions which can themselves be polarized by this interaction. The linearly polarized spectrum of the Sun is often called the second solar spectrum. Atomic polarization can be modified in weak magnetic fields by the Hanle effect. As a result, polarization of the scattered photons is also modified providing a diagnostics tool for understanding stellar magnetic fields.Polarization is also present in radiation from coherent astronomical sources (e.g. hydroxyl or methanol masers), and incoherent sources such as the large radio lobes in active galaxies, and pulsar radio radiation (which may, it is speculated, sometimes be coherent). Apart from providing information on sources of radiation and scattering, polarization also probes the interstellar magnetic field in our Galaxy as well as in radio galaxies via Faraday rotation. In some cases it can be difficult to determine how much of the Faraday rotation is in the external source and how much is local to our own Galaxy, but in many cases it is possible to find another distant source nearby in the sky; thus by comparing the candidate source and the reference source, the results can be untangled.The polarization of the cosmic microwave background (CMB) is also being used to study the physics of the very early universe. CMB exhibits 2 components of polarization: B-mode (divergence-free like magnetic field) and E-mode (curl-free gradient-only like electric field) polarization. The BICEP2 telescope located at the South Pole helped in the detection of B-mode polarization in the CMB. This may prove the existence of Gravitational Waves in our ever inflating universe but confirmation is needed.It has been suggested that astronomical sources of polarised light caused the chirality found in biological molecules on Earth.".
• Polarization_in_astronomy wikiPageExternalLink eas0928.html.
• Polarization_in_astronomy wikiPageExternalLink article263.html.
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• Polarization_in_astronomy wikiPageOutDegree "39".
• Polarization_in_astronomy wikiPageRevisionID "666530866".
• Polarization_in_astronomy wikiPageWikiLink Active_galactic_nucleus.
• Polarization_in_astronomy wikiPageWikiLink Active_galaxy.
• Polarization_in_astronomy wikiPageWikiLink Alignment-to-orientation_mechanism.
• Polarization_in_astronomy wikiPageWikiLink Ap_and_Bp_stars.
• Polarization_in_astronomy wikiPageWikiLink Ap_star.
• Polarization_in_astronomy wikiPageWikiLink Astronomer.
• Polarization_in_astronomy wikiPageWikiLink Astronomy.
• Polarization_in_astronomy wikiPageWikiLink Astrophysical_maser.
• Polarization_in_astronomy wikiPageWikiLink Atomic_polarization.
• Polarization_in_astronomy wikiPageWikiLink B-modes.
• Polarization_in_astronomy wikiPageWikiLink BICEP2.
• Polarization_in_astronomy wikiPageWikiLink BICEP_and_Keck_Array.
• Polarization_in_astronomy wikiPageWikiLink Category:Articles_containing_video_clips.
• Polarization_in_astronomy wikiPageWikiLink Category:Astrophysics.
• Polarization_in_astronomy wikiPageWikiLink Category:Polarization_(waves).
• Polarization_in_astronomy wikiPageWikiLink Chirality.
• Polarization_in_astronomy wikiPageWikiLink Chronology_of_the_universe.
• Polarization_in_astronomy wikiPageWikiLink Circular_polarization.
• Polarization_in_astronomy wikiPageWikiLink Coherent_radiation.
• Polarization_in_astronomy wikiPageWikiLink Cosmic_dust.
• Polarization_in_astronomy wikiPageWikiLink Cosmic_microwave_background.
• Polarization_in_astronomy wikiPageWikiLink Early_universe.
• Polarization_in_astronomy wikiPageWikiLink Eternal_inflation.
• Polarization_in_astronomy wikiPageWikiLink Faraday_effect.
• Polarization_in_astronomy wikiPageWikiLink Faraday_rotation.
• Polarization_in_astronomy wikiPageWikiLink Gravitational_Waves.
• Polarization_in_astronomy wikiPageWikiLink Gravitational_wave.
• Polarization_in_astronomy wikiPageWikiLink Hanle_effect.
• Polarization_in_astronomy wikiPageWikiLink Interstellar_dust.
• Polarization_in_astronomy wikiPageWikiLink Jesse_Greenstein.
• Polarization_in_astronomy wikiPageWikiLink Jesse_L._Greenstein.
• Polarization_in_astronomy wikiPageWikiLink Laser.
• Polarization_in_astronomy wikiPageWikiLink Leverett_Davis,_Jr..
• Polarization_in_astronomy wikiPageWikiLink Limb_polarization.
• Polarization_in_astronomy wikiPageWikiLink Linear_polarization.
• Polarization_in_astronomy wikiPageWikiLink Magnetic_field.
• Polarization_in_astronomy wikiPageWikiLink Photosphere.
• Polarization_in_astronomy wikiPageWikiLink Polarization_(waves).
• Polarization_in_astronomy wikiPageWikiLink Pulsar.
• Polarization_in_astronomy wikiPageWikiLink Second_solar_spectrum.
• Polarization_in_astronomy wikiPageWikiLink Star.
• Polarization_in_astronomy wikiPageWikiLink Stellar_magnetic_field.
• Polarization_in_astronomy wikiPageWikiLink Thermal_radiation.
• Polarization_in_astronomy wikiPageWikiLink Universe.
• Polarization_in_astronomy wikiPageWikiLink W._Albert_Hiltner.
• Polarization_in_astronomy wikiPageWikiLink William_Hiltner.
• Polarization_in_astronomy wikiPageWikiLinkText "E-modes".
• Polarization_in_astronomy wikiPageWikiLinkText "Polarization filters".
• Polarization_in_astronomy wikiPageWikiLinkText "Polarization in astronomy".
• Polarization_in_astronomy wikiPageWikiLinkText "polarization".
• Polarization_in_astronomy wikiPageWikiLinkText "polarized".
• Polarization_in_astronomy align "left".
• Polarization_in_astronomy caption "An animation showing how a planet's atmosphere can polarise light from its parent star. Comparing the starlight with the light reflected from the planet can give information about the planet's atmosphere.".
• Polarization_in_astronomy caption "An artist's impression of how a filter can allow only polarised light through.".
• Polarization_in_astronomy direction "horizontal".
• Polarization_in_astronomy hasPhotoCollection Polarization_in_astronomy.
• Polarization_in_astronomy image "Polarisedlight1.ogg".
• Polarization_in_astronomy image "Polarisedlight2.ogg".
• Polarization_in_astronomy width "300".
• Polarization_in_astronomy wikiPageUsesTemplate Template:Multiple_image.
• Polarization_in_astronomy wikiPageUsesTemplate Template:Reflist.
• Polarization_in_astronomy wikiPageUsesTemplate Template:Rp.
• Polarization_in_astronomy subject Category:Articles_containing_video_clips.
• Polarization_in_astronomy subject Category:Astrophysics.
• Polarization_in_astronomy subject Category:Polarization_(waves).
• Polarization_in_astronomy hypernym Phenomenon.
• Polarization_in_astronomy type Disease.
• Polarization_in_astronomy type Astrophysic.
• Polarization_in_astronomy type Sub-discipline.
• Polarization_in_astronomy comment "Polarization is an important phenomenon in astronomy. The polarization of starlight was first observed by the astronomers William Hiltner and John S. Hall in 1949. Subsequently, Jesse Greenstein and Leverett Davis, Jr. developed theories allowing the use of polarization data to trace interstellar magnetic fields.".
• Polarization_in_astronomy label "Polarization in astronomy".
• Polarization_in_astronomy sameAs Polarisation_(astronomie).
• Polarization_in_astronomy sameAs m.05gs96.
• Polarization_in_astronomy sameAs Q3394057.
• Polarization_in_astronomy sameAs Q3394057.
• Polarization_in_astronomy wasDerivedFrom Polarization_in_astronomy?oldid=666530866.
• Polarization_in_astronomy isPrimaryTopicOf Polarization_in_astronomy.