A HELIOSEISMIC SURVEY OF NEAR-SURFACE FLOWS AROUND ACTIVE REGIONS AND THEIR ASSOCIATION WITH FLARES
ABSTRACT We use helioseismic holography to study the association of shallow flows with solar flare activity in about 250 large sunspot groups observed between 2010 and 2014 with the Helioseismic and Magnetic Imager on the Solar Dynamics Observatory. Four basic flow parameters: horizontal speed, hori...
Gespeichert in:
Veröffentlicht in: | The Astrophysical journal 2016-03, Vol.819 (2), p.106 |
---|---|
1. Verfasser: | |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext bestellen |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
container_end_page | |
---|---|
container_issue | 2 |
container_start_page | 106 |
container_title | The Astrophysical journal |
container_volume | 819 |
creator | Braun, D. C. |
description | ABSTRACT We use helioseismic holography to study the association of shallow flows with solar flare activity in about 250 large sunspot groups observed between 2010 and 2014 with the Helioseismic and Magnetic Imager on the Solar Dynamics Observatory. Four basic flow parameters: horizontal speed, horizontal component of divergence, vertical component of vorticity, and a vertical kinetic helicity proxy, are mapped for each active region (AR) during its passage across the solar disk. Flow indices are derived representing the mean and standard deviation of these parameters over magnetic masks and compared with contemporary measures of flare X-ray flux. A correlation exists for several of the flow indices, especially those based on the speed and the standard deviation of all flow parameters. However, their correlation with X-ray flux is similar to that observed with the mean unsigned magnetic flux density over the same masks. The temporal variation of the flow indices are studied, and a superposed epoch analysis with respect to the occurrence to 70 M and X-class flares is made. While flows evolve with the passage of the ARs across the disk, no discernible precursors or other temporal changes specifically associated with flares are detected. |
doi_str_mv | 10.3847/0004-637X/819/2/106 |
format | Article |
fullrecord | <record><control><sourceid>proquest_O3W</sourceid><recordid>TN_cdi_proquest_miscellaneous_1787986308</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>1787986308</sourcerecordid><originalsourceid>FETCH-LOGICAL-c478t-fa4fa9563de244ae3bf7a17c7c6ef3c8384aafb76f1445acafedba4e803e7e723</originalsourceid><addsrcrecordid>eNqFkc2K2zAURkVpoem0T9CNoJtuPNafLXkpXGUiyMRgOzPtSigaiXrIxKnlLPr2lUnpsrMS9-OcC7ofAJ8xuqWC8RwhxLKS8u-5wFVOcozKN2CFCyoyRgv-Fqz-Ee_Bhxifl5FU1Qo4CTdqq5tO6e5e17Dbtw_qB2zWcKdkm6VxLWsF19vmsYOybfa7b1DWvX5QsFV3utmlNEX9RukWyq5rai37FMNH3W-SJlvVfQTvgj1G_-nvewP2a9XXm2zb3OlabjPHuJizYFmwVVHSJ08Ys54eAreYO-5KH6gT6afWhgMvA2assM4G_3SwzAtEPfec0Bvw5bp3jPNgohtm73668XTybjaEFCR5IlFfr9R5Gn9dfJzNyxCdPx7tyY-XaLBAAmNKaPE6ygWvREnRspVeUTeNMU4-mPM0vNjpt8HILB2Z5eRmacCkjgxJeZms_GoN49k8j5fplO7zX-MPwPaJ8Q</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1787986308</pqid></control><display><type>article</type><title>A HELIOSEISMIC SURVEY OF NEAR-SURFACE FLOWS AROUND ACTIVE REGIONS AND THEIR ASSOCIATION WITH FLARES</title><source>IOP Publishing Free Content</source><creator>Braun, D. C.</creator><creatorcontrib>Braun, D. C.</creatorcontrib><description>ABSTRACT We use helioseismic holography to study the association of shallow flows with solar flare activity in about 250 large sunspot groups observed between 2010 and 2014 with the Helioseismic and Magnetic Imager on the Solar Dynamics Observatory. Four basic flow parameters: horizontal speed, horizontal component of divergence, vertical component of vorticity, and a vertical kinetic helicity proxy, are mapped for each active region (AR) during its passage across the solar disk. Flow indices are derived representing the mean and standard deviation of these parameters over magnetic masks and compared with contemporary measures of flare X-ray flux. A correlation exists for several of the flow indices, especially those based on the speed and the standard deviation of all flow parameters. However, their correlation with X-ray flux is similar to that observed with the mean unsigned magnetic flux density over the same masks. The temporal variation of the flow indices are studied, and a superposed epoch analysis with respect to the occurrence to 70 M and X-class flares is made. While flows evolve with the passage of the ARs across the disk, no discernible precursors or other temporal changes specifically associated with flares are detected.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/0004-637X/819/2/106</identifier><language>eng</language><publisher>United States: The American Astronomical Society</publisher><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; COMPARATIVE EVALUATIONS ; Correlation ; CORRELATIONS ; Disks ; Flares ; Flux ; FLUX DENSITY ; HELICITY ; Horizontal ; INDEXES ; MAGNETIC FIELDS ; MAGNETIC FLUX ; Masks ; PRECURSOR ; SOLAR FLARES ; Standard deviation ; SUN ; Sun: activity ; Sun: flares ; Sun: helioseismology ; Sun: magnetic fields ; SUNSPOTS ; SURFACES ; VARIATIONS ; VELOCITY ; X RADIATION</subject><ispartof>The Astrophysical journal, 2016-03, Vol.819 (2), p.106</ispartof><rights>2016. The American Astronomical Society. All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c478t-fa4fa9563de244ae3bf7a17c7c6ef3c8384aafb76f1445acafedba4e803e7e723</citedby><cites>FETCH-LOGICAL-c478t-fa4fa9563de244ae3bf7a17c7c6ef3c8384aafb76f1445acafedba4e803e7e723</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/0004-637X/819/2/106/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>230,314,776,780,881,27901,27902,38867,53842</link.rule.ids><linktorsrc>$$Uhttps://iopscience.iop.org/article/10.3847/0004-637X/819/2/106$$EView_record_in_IOP_Publishing$$FView_record_in_$$GIOP_Publishing</linktorsrc><backlink>$$Uhttps://www.osti.gov/biblio/22521448$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Braun, D. C.</creatorcontrib><title>A HELIOSEISMIC SURVEY OF NEAR-SURFACE FLOWS AROUND ACTIVE REGIONS AND THEIR ASSOCIATION WITH FLARES</title><title>The Astrophysical journal</title><addtitle>APJ</addtitle><addtitle>Astrophys. J</addtitle><description>ABSTRACT We use helioseismic holography to study the association of shallow flows with solar flare activity in about 250 large sunspot groups observed between 2010 and 2014 with the Helioseismic and Magnetic Imager on the Solar Dynamics Observatory. Four basic flow parameters: horizontal speed, horizontal component of divergence, vertical component of vorticity, and a vertical kinetic helicity proxy, are mapped for each active region (AR) during its passage across the solar disk. Flow indices are derived representing the mean and standard deviation of these parameters over magnetic masks and compared with contemporary measures of flare X-ray flux. A correlation exists for several of the flow indices, especially those based on the speed and the standard deviation of all flow parameters. However, their correlation with X-ray flux is similar to that observed with the mean unsigned magnetic flux density over the same masks. The temporal variation of the flow indices are studied, and a superposed epoch analysis with respect to the occurrence to 70 M and X-class flares is made. While flows evolve with the passage of the ARs across the disk, no discernible precursors or other temporal changes specifically associated with flares are detected.</description><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>COMPARATIVE EVALUATIONS</subject><subject>Correlation</subject><subject>CORRELATIONS</subject><subject>Disks</subject><subject>Flares</subject><subject>Flux</subject><subject>FLUX DENSITY</subject><subject>HELICITY</subject><subject>Horizontal</subject><subject>INDEXES</subject><subject>MAGNETIC FIELDS</subject><subject>MAGNETIC FLUX</subject><subject>Masks</subject><subject>PRECURSOR</subject><subject>SOLAR FLARES</subject><subject>Standard deviation</subject><subject>SUN</subject><subject>Sun: activity</subject><subject>Sun: flares</subject><subject>Sun: helioseismology</subject><subject>Sun: magnetic fields</subject><subject>SUNSPOTS</subject><subject>SURFACES</subject><subject>VARIATIONS</subject><subject>VELOCITY</subject><subject>X RADIATION</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqFkc2K2zAURkVpoem0T9CNoJtuPNafLXkpXGUiyMRgOzPtSigaiXrIxKnlLPr2lUnpsrMS9-OcC7ofAJ8xuqWC8RwhxLKS8u-5wFVOcozKN2CFCyoyRgv-Fqz-Ee_Bhxifl5FU1Qo4CTdqq5tO6e5e17Dbtw_qB2zWcKdkm6VxLWsF19vmsYOybfa7b1DWvX5QsFV3utmlNEX9RukWyq5rai37FMNH3W-SJlvVfQTvgj1G_-nvewP2a9XXm2zb3OlabjPHuJizYFmwVVHSJ08Ys54eAreYO-5KH6gT6afWhgMvA2assM4G_3SwzAtEPfec0Bvw5bp3jPNgohtm73668XTybjaEFCR5IlFfr9R5Gn9dfJzNyxCdPx7tyY-XaLBAAmNKaPE6ygWvREnRspVeUTeNMU4-mPM0vNjpt8HILB2Z5eRmacCkjgxJeZms_GoN49k8j5fplO7zX-MPwPaJ8Q</recordid><startdate>20160310</startdate><enddate>20160310</enddate><creator>Braun, D. C.</creator><general>The American Astronomical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20160310</creationdate><title>A HELIOSEISMIC SURVEY OF NEAR-SURFACE FLOWS AROUND ACTIVE REGIONS AND THEIR ASSOCIATION WITH FLARES</title><author>Braun, D. C.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c478t-fa4fa9563de244ae3bf7a17c7c6ef3c8384aafb76f1445acafedba4e803e7e723</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>COMPARATIVE EVALUATIONS</topic><topic>Correlation</topic><topic>CORRELATIONS</topic><topic>Disks</topic><topic>Flares</topic><topic>Flux</topic><topic>FLUX DENSITY</topic><topic>HELICITY</topic><topic>Horizontal</topic><topic>INDEXES</topic><topic>MAGNETIC FIELDS</topic><topic>MAGNETIC FLUX</topic><topic>Masks</topic><topic>PRECURSOR</topic><topic>SOLAR FLARES</topic><topic>Standard deviation</topic><topic>SUN</topic><topic>Sun: activity</topic><topic>Sun: flares</topic><topic>Sun: helioseismology</topic><topic>Sun: magnetic fields</topic><topic>SUNSPOTS</topic><topic>SURFACES</topic><topic>VARIATIONS</topic><topic>VELOCITY</topic><topic>X RADIATION</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Braun, D. C.</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Braun, D. C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A HELIOSEISMIC SURVEY OF NEAR-SURFACE FLOWS AROUND ACTIVE REGIONS AND THEIR ASSOCIATION WITH FLARES</atitle><jtitle>The Astrophysical journal</jtitle><stitle>APJ</stitle><addtitle>Astrophys. J</addtitle><date>2016-03-10</date><risdate>2016</risdate><volume>819</volume><issue>2</issue><spage>106</spage><pages>106-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>ABSTRACT We use helioseismic holography to study the association of shallow flows with solar flare activity in about 250 large sunspot groups observed between 2010 and 2014 with the Helioseismic and Magnetic Imager on the Solar Dynamics Observatory. Four basic flow parameters: horizontal speed, horizontal component of divergence, vertical component of vorticity, and a vertical kinetic helicity proxy, are mapped for each active region (AR) during its passage across the solar disk. Flow indices are derived representing the mean and standard deviation of these parameters over magnetic masks and compared with contemporary measures of flare X-ray flux. A correlation exists for several of the flow indices, especially those based on the speed and the standard deviation of all flow parameters. However, their correlation with X-ray flux is similar to that observed with the mean unsigned magnetic flux density over the same masks. The temporal variation of the flow indices are studied, and a superposed epoch analysis with respect to the occurrence to 70 M and X-class flares is made. While flows evolve with the passage of the ARs across the disk, no discernible precursors or other temporal changes specifically associated with flares are detected.</abstract><cop>United States</cop><pub>The American Astronomical Society</pub><doi>10.3847/0004-637X/819/2/106</doi><tpages>12</tpages><oa>free_for_read</oa></addata></record> |
fulltext | fulltext_linktorsrc |
identifier | ISSN: 0004-637X |
ispartof | The Astrophysical journal, 2016-03, Vol.819 (2), p.106 |
issn | 0004-637X 1538-4357 |
language | eng |
recordid | cdi_proquest_miscellaneous_1787986308 |
source | IOP Publishing Free Content |
subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COMPARATIVE EVALUATIONS Correlation CORRELATIONS Disks Flares Flux FLUX DENSITY HELICITY Horizontal INDEXES MAGNETIC FIELDS MAGNETIC FLUX Masks PRECURSOR SOLAR FLARES Standard deviation SUN Sun: activity Sun: flares Sun: helioseismology Sun: magnetic fields SUNSPOTS SURFACES VARIATIONS VELOCITY X RADIATION |
title | A HELIOSEISMIC SURVEY OF NEAR-SURFACE FLOWS AROUND ACTIVE REGIONS AND THEIR ASSOCIATION WITH FLARES |
url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-28T23%3A38%3A05IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_O3W&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=A%20HELIOSEISMIC%20SURVEY%20OF%20NEAR-SURFACE%20FLOWS%20AROUND%20ACTIVE%20REGIONS%20AND%20THEIR%20ASSOCIATION%20WITH%20FLARES&rft.jtitle=The%20Astrophysical%20journal&rft.au=Braun,%20D.%20C.&rft.date=2016-03-10&rft.volume=819&rft.issue=2&rft.spage=106&rft.pages=106-&rft.issn=0004-637X&rft.eissn=1538-4357&rft_id=info:doi/10.3847/0004-637X/819/2/106&rft_dat=%3Cproquest_O3W%3E1787986308%3C/proquest_O3W%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1787986308&rft_id=info:pmid/&rfr_iscdi=true |