Quasi-periodic Oscillations of Solar Active Regions in Connection with Their Flare Activity – NoRH Observations
The sunspot-associated sources at the frequency of 17 GHz give information on plasma parameters in the regions of magnetic field about B =2000 G at the level of the chromosphere-corona transition region. The observations of short period (from one to ten minutes) oscillations in sunspots reflect prop...
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Veröffentlicht in: | Solar physics 2011-11, Vol.273 (2), p.403-412 |
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creator | Abramov-Maximov, V. E. Gelfreikh, G. B. Shibasaki, K. |
description | The sunspot-associated sources at the frequency of 17 GHz give information on plasma parameters in the regions of magnetic field about
B
=2000 G at the level of the chromosphere-corona transition region. The observations of short period (from one to ten minutes) oscillations in sunspots reflect propagation of magnetohydrodynamic (MHD) waves in the magnetic flux tubes of the sunspots. We investigate the oscillation parameters in active regions in connection with their flare activity. We confirm the existence of a link between the oscillation spectrum and flare activity. We find differences in the oscillations between pre-flare and post-flare phases. In particular, we demonstrate a case of powerful three-minute oscillations that start just before the burst. This event is similar to the cases of the precursors investigated by Sych
et al.
(
Astron. Astrophys.
505
, 791,
2009
). We also found well-defined eight-minute oscillations of microwave emission from sunspot. We interpret our observations in terms of a relationship between MHD waves propagating from sunspots and flare processes. |
doi_str_mv | 10.1007/s11207-011-9822-6 |
format | Article |
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B
=2000 G at the level of the chromosphere-corona transition region. The observations of short period (from one to ten minutes) oscillations in sunspots reflect propagation of magnetohydrodynamic (MHD) waves in the magnetic flux tubes of the sunspots. We investigate the oscillation parameters in active regions in connection with their flare activity. We confirm the existence of a link between the oscillation spectrum and flare activity. We find differences in the oscillations between pre-flare and post-flare phases. In particular, we demonstrate a case of powerful three-minute oscillations that start just before the burst. This event is similar to the cases of the precursors investigated by Sych
et al.
(
Astron. Astrophys.
505
, 791,
2009
). We also found well-defined eight-minute oscillations of microwave emission from sunspot. We interpret our observations in terms of a relationship between MHD waves propagating from sunspots and flare processes.</description><identifier>ISSN: 0038-0938</identifier><identifier>EISSN: 1573-093X</identifier><identifier>DOI: 10.1007/s11207-011-9822-6</identifier><language>eng</language><publisher>Dordrecht: Springer Netherlands</publisher><subject>Astrophysics and Astroparticles ; Atmospheric Sciences ; Corona ; Energy storage ; Energy Storage and Release–Models Meet Radio Observations ; Flares ; Joints ; Magnetic fields ; Magnetohydrodynamics ; MHD ; Oscillations ; Physics ; Physics and Astronomy ; Radio astronomy ; Solar activity ; Solar flares ; Solar physics ; Space Exploration and Astronautics ; Space Sciences (including Extraterrestrial Physics ; Sunspots ; Wave propagation</subject><ispartof>Solar physics, 2011-11, Vol.273 (2), p.403-412</ispartof><rights>Springer Science+Business Media B.V. 2011</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c380t-7511273de42f730d3822a0a02cd13dcae6f0cb5e8231b828974396d398a84daa3</citedby><cites>FETCH-LOGICAL-c380t-7511273de42f730d3822a0a02cd13dcae6f0cb5e8231b828974396d398a84daa3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s11207-011-9822-6$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s11207-011-9822-6$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27901,27902,41464,42533,51294</link.rule.ids></links><search><creatorcontrib>Abramov-Maximov, V. E.</creatorcontrib><creatorcontrib>Gelfreikh, G. B.</creatorcontrib><creatorcontrib>Shibasaki, K.</creatorcontrib><title>Quasi-periodic Oscillations of Solar Active Regions in Connection with Their Flare Activity – NoRH Observations</title><title>Solar physics</title><addtitle>Sol Phys</addtitle><description>The sunspot-associated sources at the frequency of 17 GHz give information on plasma parameters in the regions of magnetic field about
B
=2000 G at the level of the chromosphere-corona transition region. The observations of short period (from one to ten minutes) oscillations in sunspots reflect propagation of magnetohydrodynamic (MHD) waves in the magnetic flux tubes of the sunspots. We investigate the oscillation parameters in active regions in connection with their flare activity. We confirm the existence of a link between the oscillation spectrum and flare activity. We find differences in the oscillations between pre-flare and post-flare phases. In particular, we demonstrate a case of powerful three-minute oscillations that start just before the burst. This event is similar to the cases of the precursors investigated by Sych
et al.
(
Astron. Astrophys.
505
, 791,
2009
). We also found well-defined eight-minute oscillations of microwave emission from sunspot. We interpret our observations in terms of a relationship between MHD waves propagating from sunspots and flare processes.</description><subject>Astrophysics and Astroparticles</subject><subject>Atmospheric Sciences</subject><subject>Corona</subject><subject>Energy storage</subject><subject>Energy Storage and Release–Models Meet Radio Observations</subject><subject>Flares</subject><subject>Joints</subject><subject>Magnetic fields</subject><subject>Magnetohydrodynamics</subject><subject>MHD</subject><subject>Oscillations</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>Radio astronomy</subject><subject>Solar activity</subject><subject>Solar flares</subject><subject>Solar physics</subject><subject>Space Exploration and Astronautics</subject><subject>Space Sciences (including Extraterrestrial Physics</subject><subject>Sunspots</subject><subject>Wave propagation</subject><issn>0038-0938</issn><issn>1573-093X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNp9kc1KAzEUhYMoWH8ewF1wo5vRm6QzkyxLsVYQi1XBXUgzGZvSTtpkWunOd_ANfRIzjiAIChdyCd85cO5B6ITABQHILwMhFPIECEkEpzTJdlCHpDlLQLDnXdQBYLzZ-T46CGEG0KjSDlrdr1WwydJ46wqr8ShoO5-r2roqYFfiBzdXHvd0bTcGj83L17-tcN9VldENhl9tPcWPU2M9HkTYtLStt_jj7R3fufEQjybB-E3reoT2SjUP5vj7PURPg6vH_jC5HV3f9Hu3iWYc6iRPY6KcFaZLy5xBwWIqBQqoLggrtDJZCXqSGk4ZmXDKRd5lIiuY4Ip3C6XYITprfZferdYm1HJhgzYxXGXcOkhBMwGcERbJ839JkuWREl2eRvT0Fzpza1_FHFIAi0NTHiHSQtq7ELwp5dLbhfJbSUA2d5dtWzK2JZu2ZBY1tNWEyFYvxv8Y_y36BHu_l48</recordid><startdate>20111101</startdate><enddate>20111101</enddate><creator>Abramov-Maximov, V. 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E. ; Gelfreikh, G. B. ; Shibasaki, K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c380t-7511273de42f730d3822a0a02cd13dcae6f0cb5e8231b828974396d398a84daa3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Astrophysics and Astroparticles</topic><topic>Atmospheric Sciences</topic><topic>Corona</topic><topic>Energy storage</topic><topic>Energy Storage and Release–Models Meet Radio Observations</topic><topic>Flares</topic><topic>Joints</topic><topic>Magnetic fields</topic><topic>Magnetohydrodynamics</topic><topic>MHD</topic><topic>Oscillations</topic><topic>Physics</topic><topic>Physics and Astronomy</topic><topic>Radio astronomy</topic><topic>Solar activity</topic><topic>Solar flares</topic><topic>Solar physics</topic><topic>Space Exploration and Astronautics</topic><topic>Space Sciences (including Extraterrestrial Physics</topic><topic>Sunspots</topic><topic>Wave propagation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Abramov-Maximov, V. E.</creatorcontrib><creatorcontrib>Gelfreikh, G. 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E.</au><au>Gelfreikh, G. B.</au><au>Shibasaki, K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Quasi-periodic Oscillations of Solar Active Regions in Connection with Their Flare Activity – NoRH Observations</atitle><jtitle>Solar physics</jtitle><stitle>Sol Phys</stitle><date>2011-11-01</date><risdate>2011</risdate><volume>273</volume><issue>2</issue><spage>403</spage><epage>412</epage><pages>403-412</pages><issn>0038-0938</issn><eissn>1573-093X</eissn><abstract>The sunspot-associated sources at the frequency of 17 GHz give information on plasma parameters in the regions of magnetic field about
B
=2000 G at the level of the chromosphere-corona transition region. The observations of short period (from one to ten minutes) oscillations in sunspots reflect propagation of magnetohydrodynamic (MHD) waves in the magnetic flux tubes of the sunspots. We investigate the oscillation parameters in active regions in connection with their flare activity. We confirm the existence of a link between the oscillation spectrum and flare activity. We find differences in the oscillations between pre-flare and post-flare phases. In particular, we demonstrate a case of powerful three-minute oscillations that start just before the burst. This event is similar to the cases of the precursors investigated by Sych
et al.
(
Astron. Astrophys.
505
, 791,
2009
). We also found well-defined eight-minute oscillations of microwave emission from sunspot. We interpret our observations in terms of a relationship between MHD waves propagating from sunspots and flare processes.</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><doi>10.1007/s11207-011-9822-6</doi><tpages>10</tpages></addata></record> |
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subjects | Astrophysics and Astroparticles Atmospheric Sciences Corona Energy storage Energy Storage and Release–Models Meet Radio Observations Flares Joints Magnetic fields Magnetohydrodynamics MHD Oscillations Physics Physics and Astronomy Radio astronomy Solar activity Solar flares Solar physics Space Exploration and Astronautics Space Sciences (including Extraterrestrial Physics Sunspots Wave propagation |
title | Quasi-periodic Oscillations of Solar Active Regions in Connection with Their Flare Activity – NoRH Observations |
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