THE EXTREME-ULTRAVIOLET EMISSION FROM SUN-GRAZING COMETS
The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory has observed two Sun-grazing comets as they passed through the solar atmosphere. Both passages resulted in a measurable enhancement of extreme-ultraviolet (EUV) radiance in several of the AIA bandpasses. We explain this EUV emi...
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Veröffentlicht in: | The Astrophysical journal 2012-11, Vol.760 (1), p.1-8 |
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description | The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory has observed two Sun-grazing comets as they passed through the solar atmosphere. Both passages resulted in a measurable enhancement of extreme-ultraviolet (EUV) radiance in several of the AIA bandpasses. We explain this EUV emission by considering the evolution of the cometary atmosphere as it interacts with the ambient solar atmosphere. Molecules in the comet rapidly sublimate as it approaches the Sun. They are then photodissociated by the solar radiation field to create atomic species. Subsequent ionization of these atoms produces a higher abundance of ions than normally present in the corona and results in EUV emission in the wavelength ranges of the AIA telescope passbands. |
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D</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>THE EXTREME-ULTRAVIOLET EMISSION FROM SUN-GRAZING COMETS</atitle><jtitle>The Astrophysical journal</jtitle><date>2012-11-20</date><risdate>2012</risdate><volume>760</volume><issue>1</issue><spage>1</spage><epage>8</epage><pages>1-8</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory has observed two Sun-grazing comets as they passed through the solar atmosphere. Both passages resulted in a measurable enhancement of extreme-ultraviolet (EUV) radiance in several of the AIA bandpasses. We explain this EUV emission by considering the evolution of the cometary atmosphere as it interacts with the ambient solar atmosphere. Molecules in the comet rapidly sublimate as it approaches the Sun. They are then photodissociated by the solar radiation field to create atomic species. Subsequent ionization of these atoms produces a higher abundance of ions than normally present in the corona and results in EUV emission in the wavelength ranges of the AIA telescope passbands.</abstract><cop>Bristol</cop><pub>IOP</pub><doi>10.1088/0004-637x/760/1/18</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
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subjects | ASTRONOMY ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Atmospherics ATOMS COMETS Earth, ocean, space ELEMENT ABUNDANCE Emission EVOLUTION Exact sciences and technology EXTREME ULTRAVIOLET RADIATION Imaging IONIZATION IONS MOLECULES PHOTON EMISSION Radiance SOLAR ATMOSPHERE Solar observatories SOLAR RADIATION SUN TELESCOPES |
title | THE EXTREME-ULTRAVIOLET EMISSION FROM SUN-GRAZING COMETS |
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