Oscillations of Ellipsoidal Solar Active Regions
Four active regions (AR) of the sun are studied. Observational data were obtained from directly visible (line of sight) sharp_cea_720s SDO/HMI magnetograms. The data for each AR were processed by a least squares method in an ellipse. Using a sequence of images after processing the data in all the AR...
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| Veröffentlicht in: | Astrophysics 2020-02, Vol.63 (1), p.108-113 |
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| creator | Dumbadze, G. Shergelashvili, B. |
| description | Four active regions (AR) of the sun are studied. Observational data were obtained from directly visible (line of sight) sharp_cea_720s SDO/HMI magnetograms. The data for each AR were processed by a least squares method in an ellipse. Using a sequence of images after processing the data in all the AR, oscillations of the major and minor axes of the ellipse, as well as of the angles of inclination of the major axes to the equator, were detected as functions of time. These oscillations are analyzed by a fast Fourier transform method which reveals several periods with confidence levels exceeding 95%. It is found that the major axes oscillate with periods of 6-8 h and the minor axes, with periods of 6-8 h and 4-5 h. The angles of inclination of the major axes to the equator of three of the AR oscillate with a period of approximately 4 h. |
| doi_str_mv | 10.1007/s10511-020-09618-3 |
| format | Article |
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Observational data were obtained from directly visible (line of sight) sharp_cea_720s SDO/HMI magnetograms. The data for each AR were processed by a least squares method in an ellipse. Using a sequence of images after processing the data in all the AR, oscillations of the major and minor axes of the ellipse, as well as of the angles of inclination of the major axes to the equator, were detected as functions of time. These oscillations are analyzed by a fast Fourier transform method which reveals several periods with confidence levels exceeding 95%. It is found that the major axes oscillate with periods of 6-8 h and the minor axes, with periods of 6-8 h and 4-5 h. 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The angles of inclination of the major axes to the equator of three of the AR oscillate with a period of approximately 4 h.</description><subject>Analysis</subject><subject>Astronomy</subject><subject>Astrophysics</subject><subject>Astrophysics and Astroparticles</subject><subject>Astrophysics and Cosmology</subject><subject>Axes (reference lines)</subject><subject>Confidence intervals</subject><subject>Ellipsoid</subject><subject>Fast Fourier transformations</subject><subject>Fourier transforms</subject><subject>Inclination angle</subject><subject>Least squares method</subject><subject>Observations</subject><subject>Observations and Techniques</subject><subject>Oscillations</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>Solar activity</subject><subject>Solar activity regions</subject><subject>Solar magnetic field</subject><subject>Solar oscillations</subject><subject>Space Exploration and Astronautics</subject><subject>Space Sciences (including Extraterrestrial Physics</subject><issn>0571-7256</issn><issn>1573-8191</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kU1LxDAQhoMouK7-AU8FTx6qM0nbNMdF_AJBcPUc0jQpWbrNmnRF_71ZV1gWROYwMDzPDMNLyDnCFQLw64hQIuZAIQdRYZ2zAzLBkrO8RoGHZAIlx5zTsjomJzEuABImqgmB56hd36vR-SFm3ma3fe9W0btW9dnc9ypkMz26D5O9mG7DnJIjq_pozn77lLzd3b7ePORPz_ePN7OnXDOOY84ZLRtoK2Os0Ap12whua1tqCkxTQUVVWIEFNWgVZYBNqzU1bSuKSnMQDZuSi-3eVfDvaxNHufDrMKSTkjJRcl4IUe-oTvVGusH6MSi9dFHLWUWLuoaiwkRd_UGlas3SaT8Y69J8T7jcExIzms-xU-sY5eP8ZZ-lW1YHH2MwVq6CW6rwJRHkJhy5DUemcORPOJIliW2lmOChM2H33T_WN8w3jms</recordid><startdate>20200201</startdate><enddate>20200201</enddate><creator>Dumbadze, G.</creator><creator>Shergelashvili, B.</creator><general>Springer US</general><general>Springer</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>ISR</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>20200201</creationdate><title>Oscillations of Ellipsoidal Solar Active Regions</title><author>Dumbadze, G. ; Shergelashvili, B.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c371t-7325b0d6eef9ca1cdb97f8f5c203c292964f9142e1fa2301bdcc2edd946c709b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Analysis</topic><topic>Astronomy</topic><topic>Astrophysics</topic><topic>Astrophysics and Astroparticles</topic><topic>Astrophysics and Cosmology</topic><topic>Axes (reference lines)</topic><topic>Confidence intervals</topic><topic>Ellipsoid</topic><topic>Fast Fourier transformations</topic><topic>Fourier transforms</topic><topic>Inclination angle</topic><topic>Least squares method</topic><topic>Observations</topic><topic>Observations and Techniques</topic><topic>Oscillations</topic><topic>Physics</topic><topic>Physics and Astronomy</topic><topic>Solar activity</topic><topic>Solar activity regions</topic><topic>Solar magnetic field</topic><topic>Solar oscillations</topic><topic>Space Exploration and Astronautics</topic><topic>Space Sciences (including Extraterrestrial Physics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dumbadze, G.</creatorcontrib><creatorcontrib>Shergelashvili, B.</creatorcontrib><collection>CrossRef</collection><collection>Gale In Context: Science</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Astrophysics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dumbadze, G.</au><au>Shergelashvili, B.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Oscillations of Ellipsoidal Solar Active Regions</atitle><jtitle>Astrophysics</jtitle><stitle>Astrophysics</stitle><date>2020-02-01</date><risdate>2020</risdate><volume>63</volume><issue>1</issue><spage>108</spage><epage>113</epage><pages>108-113</pages><issn>0571-7256</issn><eissn>1573-8191</eissn><abstract>Four active regions (AR) of the sun are studied. 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| subjects | Analysis Astronomy Astrophysics Astrophysics and Astroparticles Astrophysics and Cosmology Axes (reference lines) Confidence intervals Ellipsoid Fast Fourier transformations Fourier transforms Inclination angle Least squares method Observations Observations and Techniques Oscillations Physics Physics and Astronomy Solar activity Solar activity regions Solar magnetic field Solar oscillations Space Exploration and Astronautics Space Sciences (including Extraterrestrial Physics |
| title | Oscillations of Ellipsoidal Solar Active Regions |
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