Active region helicity evolution and related coronal mass ejection activity
The computation of magnetic helicity has become increasingly important in the studies of solar activity. Observations of helical structures in the solar atmosphere, and their subsequent ejection into the interplanetary medium, have resulted in considerable interest to find the link between the amoun...
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2003
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v32_n10_p1959_Green http://hdl.handle.net/20.500.12110/paper_02731177_v32_n10_p1959_Green |
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paper:paper_02731177_v32_n10_p1959_Green |
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paper:paper_02731177_v32_n10_p1959_Green2023-06-08T15:25:32Z Active region helicity evolution and related coronal mass ejection activity Magnetic fields Sun Coronal mass ejections (CME) Magnetic helicity Space research corona The computation of magnetic helicity has become increasingly important in the studies of solar activity. Observations of helical structures in the solar atmosphere, and their subsequent ejection into the interplanetary medium, have resulted in considerable interest to find the link between the amount of helicity in the coronal magnetic field and the origin of coronal mass ejections (CMEs), which provide a natural method to remove helicity from the corona. Recent works have endeavored to find the source of helicity to explain the observed CME activity in specific cases. The main candidates being differential rotation, shear motions or a transfer of helicity from below the photosphere into the corona. We study and active region for several rotations during 1997 and 1998 to investigate the relative importance of these mechanisms. We find that photospheric differential rotation cannot provide the required magnetic helicity to the corona and the ejected CMEs. Localized photospheric motions can provide a larger helicity flux, though still not sufficient. © 2003 COSPAR. Published by Elsevier Ltd. All rights reserved. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v32_n10_p1959_Green http://hdl.handle.net/20.500.12110/paper_02731177_v32_n10_p1959_Green |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Magnetic fields Sun Coronal mass ejections (CME) Magnetic helicity Space research corona |
| spellingShingle |
Magnetic fields Sun Coronal mass ejections (CME) Magnetic helicity Space research corona Active region helicity evolution and related coronal mass ejection activity |
| topic_facet |
Magnetic fields Sun Coronal mass ejections (CME) Magnetic helicity Space research corona |
| description |
The computation of magnetic helicity has become increasingly important in the studies of solar activity. Observations of helical structures in the solar atmosphere, and their subsequent ejection into the interplanetary medium, have resulted in considerable interest to find the link between the amount of helicity in the coronal magnetic field and the origin of coronal mass ejections (CMEs), which provide a natural method to remove helicity from the corona. Recent works have endeavored to find the source of helicity to explain the observed CME activity in specific cases. The main candidates being differential rotation, shear motions or a transfer of helicity from below the photosphere into the corona. We study and active region for several rotations during 1997 and 1998 to investigate the relative importance of these mechanisms. We find that photospheric differential rotation cannot provide the required magnetic helicity to the corona and the ejected CMEs. Localized photospheric motions can provide a larger helicity flux, though still not sufficient. © 2003 COSPAR. Published by Elsevier Ltd. All rights reserved. |
| title |
Active region helicity evolution and related coronal mass ejection activity |
| title_short |
Active region helicity evolution and related coronal mass ejection activity |
| title_full |
Active region helicity evolution and related coronal mass ejection activity |
| title_fullStr |
Active region helicity evolution and related coronal mass ejection activity |
| title_full_unstemmed |
Active region helicity evolution and related coronal mass ejection activity |
| title_sort |
active region helicity evolution and related coronal mass ejection activity |
| publishDate |
2003 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v32_n10_p1959_Green http://hdl.handle.net/20.500.12110/paper_02731177_v32_n10_p1959_Green |
| _version_ |
1768545463897686016 |