| | |
| | |
Stat |
Members: 3667 Articles: 2'599'751 Articles rated: 2609
08 February 2025 |
|
| | | |
|
Article overview
| |
|
Formation Of The Lyman Continuum During Solar Flares | Shaun A. McLaughlin
; Ryan O. Milligan
; Graham S. Kerr
; Aaron J. Monson
; Paulo J. A. Simões
; Mihalis Mathioudakis
; | Date: |
4 Jan 2023 | Abstract: | 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. | Source: | arXiv, 2301.01648 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
|
| |
|
|
|