تقرير
Formation Of The Lyman Continuum During Solar Flares
| العنوان: | Formation Of The Lyman Continuum During Solar Flares |
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| المؤلفون: | McLaughlin, Shaun A., Milligan, Ryan O., Kerr, Graham S., Monson, Aaron J., Simões, Paulo J. A., Mathioudakis, Mihalis |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | The Lyman Continuum (LyC; $<911.12$\AA) forms at the top of the chromosphere in the quiet-Sun, making LyC a powerful tool for probing the chromospheric plasma during solar flares. To understand the effects of non-thermal energy deposition in the chromosphere during flares, we analysed LyC profiles from a grid of field-aligned radiative hydrodynamic models generated using the RADYN code as part of the F-CHROMA project. The spectral response of LyC, the temporal evolution of the departure coefficient of hydrogen, $b_1$, and the color temperature, $T_c$, in response to a range of non-thermal electron distribution functions, were investigated. The LyC intensity was seen to increase by 4-5.5 orders of magnitude during solar flares, responding most strongly to the non-thermal electron flux of the beam. Generally, $b_1$ decreased from $10^2$-$10^3$ to closer to unity during solar flares, indicating a stronger coupling to local conditions, while $T_c$ increased from $8$-$9$kK to $10$-$16$kK. $T_c$ was found to be approximately equal to the electron temperature of the plasma when $b_1$ was at a minimum. Both optically thick and optically thin components of LyC were found in agreement with the interpretation of recent observations. The optically thick layer forms deeper in the chromosphere during a flare compared to quiescent periods, whereas the optically thin layers form at higher altitudes due to chromospheric evaporation, in low-temperature, high-density regions propagating upwards. We put these results in the context of current and future missions. Comment: Accepted for publication in The Astrophysical Journal: 18 pages, 16 Figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/acaf66 |
| URL الوصول: | http://arxiv.org/abs/2301.01648 |
| رقم الأكسشن: | edsarx.2301.01648 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/acaf66 |
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