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Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data
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| Zeitschriftentitel: | Astronomy & Astrophysics |
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| Personen und Körperschaften: | , , , |
| In: | Astronomy & Astrophysics, 625, 2019, S. A117 |
| Format: | E-Article |
| Sprache: | Unbestimmt |
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EDP Sciences
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| Schlagwörter: |
| author_facet |
Inceoglu, F. Simoniello, R. Arlt, R. Rempel, M. Inceoglu, F. Simoniello, R. Arlt, R. Rempel, M. |
|---|---|
| author |
Inceoglu, F. Simoniello, R. Arlt, R. Rempel, M. |
| spellingShingle |
Inceoglu, F. Simoniello, R. Arlt, R. Rempel, M. Astronomy & Astrophysics Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data Space and Planetary Science Astronomy and Astrophysics |
| author_sort |
inceoglu, f. |
| spelling |
Inceoglu, F. Simoniello, R. Arlt, R. Rempel, M. 0004-6361 1432-0746 EDP Sciences Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.1051/0004-6361/201935272 <jats:p><jats:italic>Context</jats:italic>. Solar magnetic activity exhibits variations with periods between 1.5 and 4 years, the so-called quasi-biennial oscillations (QBOs), in addition to the well-known 11-year Schwabe cycles. Solar dynamo is thought to be the mechanism responsible for the generation of QBOs.</jats:p> <jats:p><jats:italic>Aims</jats:italic>. In this work, we analyse sunspot areas to investigate the spatial and temporal behaviour of the QBO signal and study the physical mechanisms responsible using simulations from fully non-linear mean-field flux-transport dynamos.</jats:p> <jats:p><jats:italic>Methods</jats:italic>. We investigated the behaviour of the QBOs in the sunspot area data for the full disk, and the northern and southern hemispheres, using wavelet and Fourier analyses. We also ran solar dynamos with two different approaches to generating a poloidal field from an existing toroidal field, namely Babcock–Leighton and turbulent <jats:italic>α</jats:italic> mechanisms. We then studied the simulated magnetic field strengths as well as meridional circulation and differential rotation rates using the same methods.</jats:p> <jats:p><jats:italic>Results</jats:italic>. The results from the sunspot areas show that the QBOs are present in the full disk and hemispheric sunspot areas. These QBOs show slightly different spatial and temporal behaviours, indicating slightly decoupled solar hemispheres. The QBO signal is generally intermittent and in-phase with the sunspot area data, surfacing when the solar activity is at its maximum. The results from the BL-dynamos show that they are neither capable of generating the slightly decoupled behaviour of solar hemispheres nor can they generate QBO-like signals. The turbulent <jats:italic>α</jats:italic>-dynamos on the other hand generated decoupled hemispheres and some QBO-like shorter cycles.</jats:p> <jats:p><jats:italic>Conclusions</jats:italic>. In conclusion, our simulations show that the turbulent <jats:italic>α</jats:italic>-dynamos with the Lorentz force seem more efficient in generating the observed temporal and spatial behaviour of the QBO signal compared with the BL-dynamos.</jats:p> Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data Astronomy & Astrophysics |
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10.1051/0004-6361/201935272 |
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Online Free |
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Physik Technik |
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ElectronicArticle |
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EDP Sciences, 2019 |
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EDP Sciences, 2019 |
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0004-6361 1432-0746 |
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0004-6361 1432-0746 |
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EDP Sciences (CrossRef) |
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inceoglu2019constrainingnonlineardynamomodelsusingquasibiennialoscillationsfromsunspotareadata |
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2019 |
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EDP Sciences |
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ai |
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Astronomy & Astrophysics |
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49 |
| title |
Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_unstemmed |
Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_full |
Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_fullStr |
Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_full_unstemmed |
Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_short |
Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_sort |
constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| topic |
Space and Planetary Science Astronomy and Astrophysics |
| url |
http://dx.doi.org/10.1051/0004-6361/201935272 |
| publishDate |
2019 |
| physical |
A117 |
| description |
<jats:p><jats:italic>Context</jats:italic>. Solar magnetic activity exhibits variations with periods between 1.5 and 4 years, the so-called quasi-biennial oscillations (QBOs), in addition to the well-known 11-year Schwabe cycles. Solar dynamo is thought to be the mechanism responsible for the generation of QBOs.</jats:p>
<jats:p><jats:italic>Aims</jats:italic>. In this work, we analyse sunspot areas to investigate the spatial and temporal behaviour of the QBO signal and study the physical mechanisms responsible using simulations from fully non-linear mean-field flux-transport dynamos.</jats:p>
<jats:p><jats:italic>Methods</jats:italic>. We investigated the behaviour of the QBOs in the sunspot area data for the full disk, and the northern and southern hemispheres, using wavelet and Fourier analyses. We also ran solar dynamos with two different approaches to generating a poloidal field from an existing toroidal field, namely Babcock–Leighton and turbulent <jats:italic>α</jats:italic> mechanisms. We then studied the simulated magnetic field strengths as well as meridional circulation and differential rotation rates using the same methods.</jats:p>
<jats:p><jats:italic>Results</jats:italic>. The results from the sunspot areas show that the QBOs are present in the full disk and hemispheric sunspot areas. These QBOs show slightly different spatial and temporal behaviours, indicating slightly decoupled solar hemispheres. The QBO signal is generally intermittent and in-phase with the sunspot area data, surfacing when the solar activity is at its maximum. The results from the BL-dynamos show that they are neither capable of generating the slightly decoupled behaviour of solar hemispheres nor can they generate QBO-like signals. The turbulent <jats:italic>α</jats:italic>-dynamos on the other hand generated decoupled hemispheres and some QBO-like shorter cycles.</jats:p>
<jats:p><jats:italic>Conclusions</jats:italic>. In conclusion, our simulations show that the turbulent <jats:italic>α</jats:italic>-dynamos with the Lorentz force seem more efficient in generating the observed temporal and spatial behaviour of the QBO signal compared with the BL-dynamos.</jats:p> |
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| author | Inceoglu, F., Simoniello, R., Arlt, R., Rempel, M. |
| author_facet | Inceoglu, F., Simoniello, R., Arlt, R., Rempel, M., Inceoglu, F., Simoniello, R., Arlt, R., Rempel, M. |
| author_sort | inceoglu, f. |
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| container_title | Astronomy & Astrophysics |
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| description | <jats:p><jats:italic>Context</jats:italic>. Solar magnetic activity exhibits variations with periods between 1.5 and 4 years, the so-called quasi-biennial oscillations (QBOs), in addition to the well-known 11-year Schwabe cycles. Solar dynamo is thought to be the mechanism responsible for the generation of QBOs.</jats:p> <jats:p><jats:italic>Aims</jats:italic>. In this work, we analyse sunspot areas to investigate the spatial and temporal behaviour of the QBO signal and study the physical mechanisms responsible using simulations from fully non-linear mean-field flux-transport dynamos.</jats:p> <jats:p><jats:italic>Methods</jats:italic>. We investigated the behaviour of the QBOs in the sunspot area data for the full disk, and the northern and southern hemispheres, using wavelet and Fourier analyses. We also ran solar dynamos with two different approaches to generating a poloidal field from an existing toroidal field, namely Babcock–Leighton and turbulent <jats:italic>α</jats:italic> mechanisms. We then studied the simulated magnetic field strengths as well as meridional circulation and differential rotation rates using the same methods.</jats:p> <jats:p><jats:italic>Results</jats:italic>. The results from the sunspot areas show that the QBOs are present in the full disk and hemispheric sunspot areas. These QBOs show slightly different spatial and temporal behaviours, indicating slightly decoupled solar hemispheres. The QBO signal is generally intermittent and in-phase with the sunspot area data, surfacing when the solar activity is at its maximum. The results from the BL-dynamos show that they are neither capable of generating the slightly decoupled behaviour of solar hemispheres nor can they generate QBO-like signals. The turbulent <jats:italic>α</jats:italic>-dynamos on the other hand generated decoupled hemispheres and some QBO-like shorter cycles.</jats:p> <jats:p><jats:italic>Conclusions</jats:italic>. In conclusion, our simulations show that the turbulent <jats:italic>α</jats:italic>-dynamos with the Lorentz force seem more efficient in generating the observed temporal and spatial behaviour of the QBO signal compared with the BL-dynamos.</jats:p> |
| doi_str_mv | 10.1051/0004-6361/201935272 |
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| imprint | EDP Sciences, 2019 |
| imprint_str_mv | EDP Sciences, 2019 |
| institution | DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15 |
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| physical | A117 |
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| publisher | EDP Sciences |
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| recordtype | ai |
| series | Astronomy & Astrophysics |
| source_id | 49 |
| spelling | Inceoglu, F. Simoniello, R. Arlt, R. Rempel, M. 0004-6361 1432-0746 EDP Sciences Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.1051/0004-6361/201935272 <jats:p><jats:italic>Context</jats:italic>. Solar magnetic activity exhibits variations with periods between 1.5 and 4 years, the so-called quasi-biennial oscillations (QBOs), in addition to the well-known 11-year Schwabe cycles. Solar dynamo is thought to be the mechanism responsible for the generation of QBOs.</jats:p> <jats:p><jats:italic>Aims</jats:italic>. In this work, we analyse sunspot areas to investigate the spatial and temporal behaviour of the QBO signal and study the physical mechanisms responsible using simulations from fully non-linear mean-field flux-transport dynamos.</jats:p> <jats:p><jats:italic>Methods</jats:italic>. We investigated the behaviour of the QBOs in the sunspot area data for the full disk, and the northern and southern hemispheres, using wavelet and Fourier analyses. We also ran solar dynamos with two different approaches to generating a poloidal field from an existing toroidal field, namely Babcock–Leighton and turbulent <jats:italic>α</jats:italic> mechanisms. We then studied the simulated magnetic field strengths as well as meridional circulation and differential rotation rates using the same methods.</jats:p> <jats:p><jats:italic>Results</jats:italic>. The results from the sunspot areas show that the QBOs are present in the full disk and hemispheric sunspot areas. These QBOs show slightly different spatial and temporal behaviours, indicating slightly decoupled solar hemispheres. The QBO signal is generally intermittent and in-phase with the sunspot area data, surfacing when the solar activity is at its maximum. The results from the BL-dynamos show that they are neither capable of generating the slightly decoupled behaviour of solar hemispheres nor can they generate QBO-like signals. The turbulent <jats:italic>α</jats:italic>-dynamos on the other hand generated decoupled hemispheres and some QBO-like shorter cycles.</jats:p> <jats:p><jats:italic>Conclusions</jats:italic>. In conclusion, our simulations show that the turbulent <jats:italic>α</jats:italic>-dynamos with the Lorentz force seem more efficient in generating the observed temporal and spatial behaviour of the QBO signal compared with the BL-dynamos.</jats:p> Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data Astronomy & Astrophysics |
| spellingShingle | Inceoglu, F., Simoniello, R., Arlt, R., Rempel, M., Astronomy & Astrophysics, Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data, Space and Planetary Science, Astronomy and Astrophysics |
| title | Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_full | Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_fullStr | Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_full_unstemmed | Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_short | Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_sort | constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| title_unstemmed | Constraining non-linear dynamo models using quasi-biennial oscillations from sunspot area data |
| topic | Space and Planetary Science, Astronomy and Astrophysics |
| url | http://dx.doi.org/10.1051/0004-6361/201935272 |