The Link Between Non-Thermal Velocity and Free Magnetic Energy in Solar Flares
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911761736663040 |
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| author | McKevitt, James Jarolim, Robert Matthews, Sarah Baker, Deborah Temmer, Manuela Veronig, Astrid Reid, Hamish Green, Lucie |
| author_facet | McKevitt, James Jarolim, Robert Matthews, Sarah Baker, Deborah Temmer, Manuela Veronig, Astrid Reid, Hamish Green, Lucie |
| contents | The cause of excess spectral line broadening (non-thermal velocity) is not definitively known, but given its rise before and during flaring, the causal processes hold clues to understanding the triggers for the onset of reconnection and the release of free magnetic energy from the coronal magnetic field. A comparison of data during a 9-hour period from the extreme ultraviolet (EUV) Imaging Spectrometer (EIS) on the Hinode spacecraft - at a 3-minute cadence - and non-linear force-free field (NLFFF) extrapolations performed on Helioseismic and Magnetic Imager (HMI) magnetograms - at a 12-minute cadence - shows an inverse relationship between non-thermal velocity and free magnetic energy on short timescales during two X-class solar flares on 6 September 2017. Analysis of these results supports suggestions that unresolved Doppler flows do not solely cause non-thermal broadening and instead other mechanisms like Alfvén wave propagation and isotropic turbulence have a greater influence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_07982 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Link Between Non-Thermal Velocity and Free Magnetic Energy in Solar Flares McKevitt, James Jarolim, Robert Matthews, Sarah Baker, Deborah Temmer, Manuela Veronig, Astrid Reid, Hamish Green, Lucie Solar and Stellar Astrophysics The cause of excess spectral line broadening (non-thermal velocity) is not definitively known, but given its rise before and during flaring, the causal processes hold clues to understanding the triggers for the onset of reconnection and the release of free magnetic energy from the coronal magnetic field. A comparison of data during a 9-hour period from the extreme ultraviolet (EUV) Imaging Spectrometer (EIS) on the Hinode spacecraft - at a 3-minute cadence - and non-linear force-free field (NLFFF) extrapolations performed on Helioseismic and Magnetic Imager (HMI) magnetograms - at a 12-minute cadence - shows an inverse relationship between non-thermal velocity and free magnetic energy on short timescales during two X-class solar flares on 6 September 2017. Analysis of these results supports suggestions that unresolved Doppler flows do not solely cause non-thermal broadening and instead other mechanisms like Alfvén wave propagation and isotropic turbulence have a greater influence. |
| title | The Link Between Non-Thermal Velocity and Free Magnetic Energy in Solar Flares |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2401.07982 |