Sub-surface plasma flows and the flare productivity of solar active regions
The extreme space weather conditions resulting from high energetic events likes solar flares and Coronal Mass Ejections demand for reliable space weather forecasting. The magnetic flux tubes while rising through the convection zone gets twisted by the turbulent plasma flows, energizing the system an...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2022-10-01
|
| Series: | Frontiers in Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fspas.2022.1020748/full |
| _version_ | 1828323673976602624 |
|---|---|
| author | B. Lekshmi B. Lekshmi Kiran Jain Rudolf W. Komm Dibyendu Nandy Dibyendu Nandy |
| author_facet | B. Lekshmi B. Lekshmi Kiran Jain Rudolf W. Komm Dibyendu Nandy Dibyendu Nandy |
| author_sort | B. Lekshmi |
| collection | DOAJ |
| description | The extreme space weather conditions resulting from high energetic events likes solar flares and Coronal Mass Ejections demand for reliable space weather forecasting. The magnetic flux tubes while rising through the convection zone gets twisted by the turbulent plasma flows, energizing the system and resulting in flares. We investigate the relationship between the subsurface plasma flows associated with flaring active regions and their surface magnetic flux and current helicity. The near-surface horizontal velocities derived from the ring-diagram analysis of active region patches using Global Oscillation Network Group Doppler velocity measurements are used to compute the fluid dynamics descriptors like vertical divergence, vorticity and kinetic helicity used in this work. The flaring active regions are observed to have large value of vertical vorticity and kinetic helicity. Also, the horizontal flow divergence, vorticity, flux, kinetic and current helicities are observed to be significantly correlated and evolve in phase with each other. We observe that the integrated values of the above flow and magnetic parameters observed 1 day prior to the flare are significantly correlated with the integrated flare intensity of the active region. Hence, we show that strong vorticity/kinetic helicities lead to larger active region twisting, presumably generating high-intensity flares. |
| first_indexed | 2024-04-13T18:55:47Z |
| format | Article |
| id | doaj.art-caa90185684942a8bb95362bf281ef55 |
| institution | Directory Open Access Journal |
| issn | 2296-987X |
| language | English |
| last_indexed | 2024-04-13T18:55:47Z |
| publishDate | 2022-10-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Astronomy and Space Sciences |
| spelling | doaj.art-caa90185684942a8bb95362bf281ef552022-12-22T02:34:15ZengFrontiers Media S.A.Frontiers in Astronomy and Space Sciences2296-987X2022-10-01910.3389/fspas.2022.10207481020748Sub-surface plasma flows and the flare productivity of solar active regionsB. Lekshmi0B. Lekshmi1Kiran Jain2Rudolf W. Komm3Dibyendu Nandy4Dibyendu Nandy5Max Planck Institute for Solar System Research, Göttingen, GermanyCenter of Excellence in Space Sciences India, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, IndiaNational Solar Observatory, Boulder, CO, United StatesNational Solar Observatory, Boulder, CO, United StatesCenter of Excellence in Space Sciences India, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, IndiaDepartment of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, IndiaThe extreme space weather conditions resulting from high energetic events likes solar flares and Coronal Mass Ejections demand for reliable space weather forecasting. The magnetic flux tubes while rising through the convection zone gets twisted by the turbulent plasma flows, energizing the system and resulting in flares. We investigate the relationship between the subsurface plasma flows associated with flaring active regions and their surface magnetic flux and current helicity. The near-surface horizontal velocities derived from the ring-diagram analysis of active region patches using Global Oscillation Network Group Doppler velocity measurements are used to compute the fluid dynamics descriptors like vertical divergence, vorticity and kinetic helicity used in this work. The flaring active regions are observed to have large value of vertical vorticity and kinetic helicity. Also, the horizontal flow divergence, vorticity, flux, kinetic and current helicities are observed to be significantly correlated and evolve in phase with each other. We observe that the integrated values of the above flow and magnetic parameters observed 1 day prior to the flare are significantly correlated with the integrated flare intensity of the active region. Hence, we show that strong vorticity/kinetic helicities lead to larger active region twisting, presumably generating high-intensity flares.https://www.frontiersin.org/articles/10.3389/fspas.2022.1020748/fullSunhelioseismologyactive regionsplasma flowshelicityflares |
| spellingShingle | B. Lekshmi B. Lekshmi Kiran Jain Rudolf W. Komm Dibyendu Nandy Dibyendu Nandy Sub-surface plasma flows and the flare productivity of solar active regions Frontiers in Astronomy and Space Sciences Sun helioseismology active regions plasma flows helicity flares |
| title | Sub-surface plasma flows and the flare productivity of solar active regions |
| title_full | Sub-surface plasma flows and the flare productivity of solar active regions |
| title_fullStr | Sub-surface plasma flows and the flare productivity of solar active regions |
| title_full_unstemmed | Sub-surface plasma flows and the flare productivity of solar active regions |
| title_short | Sub-surface plasma flows and the flare productivity of solar active regions |
| title_sort | sub surface plasma flows and the flare productivity of solar active regions |
| topic | Sun helioseismology active regions plasma flows helicity flares |
| url | https://www.frontiersin.org/articles/10.3389/fspas.2022.1020748/full |
| work_keys_str_mv | AT blekshmi subsurfaceplasmaflowsandtheflareproductivityofsolaractiveregions AT blekshmi subsurfaceplasmaflowsandtheflareproductivityofsolaractiveregions AT kiranjain subsurfaceplasmaflowsandtheflareproductivityofsolaractiveregions AT rudolfwkomm subsurfaceplasmaflowsandtheflareproductivityofsolaractiveregions AT dibyendunandy subsurfaceplasmaflowsandtheflareproductivityofsolaractiveregions AT dibyendunandy subsurfaceplasmaflowsandtheflareproductivityofsolaractiveregions |