Conduction-driven chromospheric evaporation in a solar flare
Observations of gentle chromospheric evaporation during the cooling phase of a solar flare are presented. Line profiles of the low-temperature (T of about 6 x 10 to the 6th K) coronal Mg XI line, observed with the X-Ray Polychromator on the Solar Maximum Mission, show a blueshift that persisted for...
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| Veröffentlicht in: | Astrophys. J.; (United States) 1988-06, Vol.329 |
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| container_title | Astrophys. J.; (United States) |
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| creator | Zarro, Dominic M. Lemen, James R. |
| description | Observations of gentle chromospheric evaporation during the cooling phase of a solar flare are presented. Line profiles of the low-temperature (T of about 6 x 10 to the 6th K) coronal Mg XI line, observed with the X-Ray Polychromator on the Solar Maximum Mission, show a blueshift that persisted for several minutes after the impulsive heating phase. This result represents the first detection of an evaporation signature in a soft X-ray line formed at this low temperature. By combining the Mg XI blueshift velocity data with simultaneous measurements of the flare temperature derived from Ca XIX observations, it is demonstrated that the upward flux of enthalpy transported by this gently evaporating plasma varies linearly with the downward flux of thermal energy conducted from the corona. This relationship is consistent with models of solar flares in which thermal conduction drives chromospheric evaporation during the early part of the cooling phase. |
| doi_str_mv | 10.1086/166391 |
| format | Article |
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Goddard Space Flight Center ; Applied Research Corp., Greenbelt, MD (USA) ; University College, London (England)</creatorcontrib><description>Observations of gentle chromospheric evaporation during the cooling phase of a solar flare are presented. Line profiles of the low-temperature (T of about 6 x 10 to the 6th K) coronal Mg XI line, observed with the X-Ray Polychromator on the Solar Maximum Mission, show a blueshift that persisted for several minutes after the impulsive heating phase. This result represents the first detection of an evaporation signature in a soft X-ray line formed at this low temperature. By combining the Mg XI blueshift velocity data with simultaneous measurements of the flare temperature derived from Ca XIX observations, it is demonstrated that the upward flux of enthalpy transported by this gently evaporating plasma varies linearly with the downward flux of thermal energy conducted from the corona. This relationship is consistent with models of solar flares in which thermal conduction drives chromospheric evaporation during the early part of the cooling phase.</description><identifier>ISSN: 0004-637X</identifier><identifier>DOI: 10.1086/166391</identifier><language>eng</language><publisher>Legacy CDMS</publisher><subject>640104 - Astrophysics & Cosmology- Solar Phenomena ; ALKALINE EARTH METALS ; ATMOSPHERES ; CALCIUM ; CHROMOSPHERE ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; COOLING ; DOPPLER EFFECT ; ELEMENTS ; ENERGY TRANSFER ; EVAPORATION ; HEAT TRANSFER ; MAGNESIUM ; METALS ; PHASE TRANSFORMATIONS ; SOLAR ACTIVITY ; SOLAR ATMOSPHERE ; SOLAR CORONA ; SOLAR FLARES ; Solar Physics ; STELLAR ATMOSPHERES ; STELLAR CORONAE</subject><ispartof>Astrophys. 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J.; (United States)</title><description>Observations of gentle chromospheric evaporation during the cooling phase of a solar flare are presented. Line profiles of the low-temperature (T of about 6 x 10 to the 6th K) coronal Mg XI line, observed with the X-Ray Polychromator on the Solar Maximum Mission, show a blueshift that persisted for several minutes after the impulsive heating phase. This result represents the first detection of an evaporation signature in a soft X-ray line formed at this low temperature. By combining the Mg XI blueshift velocity data with simultaneous measurements of the flare temperature derived from Ca XIX observations, it is demonstrated that the upward flux of enthalpy transported by this gently evaporating plasma varies linearly with the downward flux of thermal energy conducted from the corona. This relationship is consistent with models of solar flares in which thermal conduction drives chromospheric evaporation during the early part of the cooling phase.</description><subject>640104 - Astrophysics & Cosmology- Solar Phenomena</subject><subject>ALKALINE EARTH METALS</subject><subject>ATMOSPHERES</subject><subject>CALCIUM</subject><subject>CHROMOSPHERE</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>COOLING</subject><subject>DOPPLER EFFECT</subject><subject>ELEMENTS</subject><subject>ENERGY TRANSFER</subject><subject>EVAPORATION</subject><subject>HEAT TRANSFER</subject><subject>MAGNESIUM</subject><subject>METALS</subject><subject>PHASE TRANSFORMATIONS</subject><subject>SOLAR ACTIVITY</subject><subject>SOLAR ATMOSPHERE</subject><subject>SOLAR CORONA</subject><subject>SOLAR FLARES</subject><subject>Solar Physics</subject><subject>STELLAR ATMOSPHERES</subject><subject>STELLAR CORONAE</subject><issn>0004-637X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1988</creationdate><recordtype>article</recordtype><sourceid>CYI</sourceid><recordid>eNotjM1KAzEYRbNQsFZ9AhfB_WgyycQv4EYG_6DgRsHdkJ8vTKQmJYl9fqfUzT1cOBxCrji75QzUHVdKaH5CVowx2Slx_3VGzmv9Ptxe6xV5GHPyv67FnDpf4h4TdXPJP7nuZizRUdybXS7mINCYqKE1b02hYRm8IKfBbCte_nNNPp-fPsbXbvP-8jY-brrEhWjdYJhjAD54lMxy5q3oJUiBAYXVEKTFwWiJwNEi-KEPiFJyB4L7MCCKNbk5dnNtcaouNnSzyymha5PSSksFi3R9lJKpZkqt1IlrAMaGfoH4Azi1T-U</recordid><startdate>19880601</startdate><enddate>19880601</enddate><creator>Zarro, Dominic M.</creator><creator>Lemen, James R.</creator><scope>CYE</scope><scope>CYI</scope><scope>OTOTI</scope></search><sort><creationdate>19880601</creationdate><title>Conduction-driven chromospheric evaporation in a solar flare</title><author>Zarro, Dominic M. ; Lemen, James R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-n133t-5a0c088dfde40b10db324843efe3b98f4be5a94e81ebe8d52fee441c831df5ee3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1988</creationdate><topic>640104 - Astrophysics & Cosmology- Solar Phenomena</topic><topic>ALKALINE EARTH METALS</topic><topic>ATMOSPHERES</topic><topic>CALCIUM</topic><topic>CHROMOSPHERE</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>COOLING</topic><topic>DOPPLER EFFECT</topic><topic>ELEMENTS</topic><topic>ENERGY TRANSFER</topic><topic>EVAPORATION</topic><topic>HEAT TRANSFER</topic><topic>MAGNESIUM</topic><topic>METALS</topic><topic>PHASE TRANSFORMATIONS</topic><topic>SOLAR ACTIVITY</topic><topic>SOLAR ATMOSPHERE</topic><topic>SOLAR CORONA</topic><topic>SOLAR FLARES</topic><topic>Solar Physics</topic><topic>STELLAR ATMOSPHERES</topic><topic>STELLAR CORONAE</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zarro, Dominic M.</creatorcontrib><creatorcontrib>Lemen, James R.</creatorcontrib><creatorcontrib>National Aeronautics and Space Administration, Greenbelt, MD (USA). Goddard Space Flight Center</creatorcontrib><creatorcontrib>Applied Research Corp., Greenbelt, MD (USA)</creatorcontrib><creatorcontrib>University College, London (England)</creatorcontrib><collection>NASA Scientific and Technical Information</collection><collection>NASA Technical Reports Server</collection><collection>OSTI.GOV</collection><jtitle>Astrophys. J.; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zarro, Dominic M.</au><au>Lemen, James R.</au><aucorp>National Aeronautics and Space Administration, Greenbelt, MD (USA). Goddard Space Flight Center</aucorp><aucorp>Applied Research Corp., Greenbelt, MD (USA)</aucorp><aucorp>University College, London (England)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Conduction-driven chromospheric evaporation in a solar flare</atitle><jtitle>Astrophys. J.; (United States)</jtitle><date>1988-06-01</date><risdate>1988</risdate><volume>329</volume><issn>0004-637X</issn><abstract>Observations of gentle chromospheric evaporation during the cooling phase of a solar flare are presented. Line profiles of the low-temperature (T of about 6 x 10 to the 6th K) coronal Mg XI line, observed with the X-Ray Polychromator on the Solar Maximum Mission, show a blueshift that persisted for several minutes after the impulsive heating phase. This result represents the first detection of an evaporation signature in a soft X-ray line formed at this low temperature. By combining the Mg XI blueshift velocity data with simultaneous measurements of the flare temperature derived from Ca XIX observations, it is demonstrated that the upward flux of enthalpy transported by this gently evaporating plasma varies linearly with the downward flux of thermal energy conducted from the corona. This relationship is consistent with models of solar flares in which thermal conduction drives chromospheric evaporation during the early part of the cooling phase.</abstract><cop>Legacy CDMS</cop><doi>10.1086/166391</doi></addata></record> |
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| identifier | ISSN: 0004-637X |
| ispartof | Astrophys. J.; (United States), 1988-06, Vol.329 |
| issn | 0004-637X |
| language | eng |
| recordid | cdi_nasa_ntrs_19880052988 |
| source | NASA Technical Reports Server; Alma/SFX Local Collection |
| subjects | 640104 - Astrophysics & Cosmology- Solar Phenomena ALKALINE EARTH METALS ATMOSPHERES CALCIUM CHROMOSPHERE CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COOLING DOPPLER EFFECT ELEMENTS ENERGY TRANSFER EVAPORATION HEAT TRANSFER MAGNESIUM METALS PHASE TRANSFORMATIONS SOLAR ACTIVITY SOLAR ATMOSPHERE SOLAR CORONA SOLAR FLARES Solar Physics STELLAR ATMOSPHERES STELLAR CORONAE |
| title | Conduction-driven chromospheric evaporation in a solar flare |
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