Modeling the transport and anisotropy of energetic electrons in solar flares
Transport of energetic electrons in the flare loop is important to understanding nonthermal emissions in solar flares. In this work, we model the propagation of electrons by numerically solving the particle transport equation which includes the physics of magnetic mirroring and turbulent pitch-angle...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2025-01-01
|
| Series: | Frontiers in Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fspas.2024.1510579/full |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841540117995454464 |
|---|---|
| author | Xiangliang Kong Xiangliang Kong Xiangliang Kong Hao Ning Yao Chen Yao Chen |
| author_facet | Xiangliang Kong Xiangliang Kong Xiangliang Kong Hao Ning Yao Chen Yao Chen |
| author_sort | Xiangliang Kong |
| collection | DOAJ |
| description | Transport of energetic electrons in the flare loop is important to understanding nonthermal emissions in solar flares. In this work, we model the propagation of electrons by numerically solving the particle transport equation which includes the physics of magnetic mirroring and turbulent pitch-angle diffusion. We find that both the fractions of electrons trapped in the looptop and precipitating into the solar surface display a non-monotonic behavior with increasing scattering rate. In the moderate diffusion regime, the precipitation fraction is highest and we expect intense nonthermal HXR and microwave emissions at the footpoints. With no or weak pitch-angle scattering, the velocity space distribution can be highly anisotropic both in the looptop and loopleg regions. Different patterns of stripes with positive gradients in the perpendicular direction can drive the electron cyclotron maser instability with higher efficiency than the classical loss-cone distribution, facilitating the excitation of coherent solar radio bursts. Our simulation results highlight the effects of turbulent pitch-angle scattering on electron trap/precipitation and anisotropic distribution in solar flares, which may help us understand the precipitation of magnetospheric electrons accounting for the aurora as well. |
| format | Article |
| id | doaj-art-68cb130a5e7b4a10863b83e6862f0b38 |
| institution | Kabale University |
| issn | 2296-987X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Astronomy and Space Sciences |
| spelling | doaj-art-68cb130a5e7b4a10863b83e6862f0b382025-01-14T06:10:39ZengFrontiers Media S.A.Frontiers in Astronomy and Space Sciences2296-987X2025-01-011110.3389/fspas.2024.15105791510579Modeling the transport and anisotropy of energetic electrons in solar flaresXiangliang Kong0Xiangliang Kong1Xiangliang Kong2Hao Ning3Yao Chen4Yao Chen5School of Space Science and Physics, Institute of Space Sciences, Shandong University, Weihai, Shandong, ChinaInstitute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, Shandong, ChinaYunnan Key Laboratory of Solar Physics and Space Science, Kunming, ChinaInstitute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, Shandong, ChinaSchool of Space Science and Physics, Institute of Space Sciences, Shandong University, Weihai, Shandong, ChinaInstitute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, Shandong, ChinaTransport of energetic electrons in the flare loop is important to understanding nonthermal emissions in solar flares. In this work, we model the propagation of electrons by numerically solving the particle transport equation which includes the physics of magnetic mirroring and turbulent pitch-angle diffusion. We find that both the fractions of electrons trapped in the looptop and precipitating into the solar surface display a non-monotonic behavior with increasing scattering rate. In the moderate diffusion regime, the precipitation fraction is highest and we expect intense nonthermal HXR and microwave emissions at the footpoints. With no or weak pitch-angle scattering, the velocity space distribution can be highly anisotropic both in the looptop and loopleg regions. Different patterns of stripes with positive gradients in the perpendicular direction can drive the electron cyclotron maser instability with higher efficiency than the classical loss-cone distribution, facilitating the excitation of coherent solar radio bursts. Our simulation results highlight the effects of turbulent pitch-angle scattering on electron trap/precipitation and anisotropic distribution in solar flares, which may help us understand the precipitation of magnetospheric electrons accounting for the aurora as well.https://www.frontiersin.org/articles/10.3389/fspas.2024.1510579/fullsolar flaresenergetic electronsparticle transportsolar X-ray emissionsolar radio emission |
| spellingShingle | Xiangliang Kong Xiangliang Kong Xiangliang Kong Hao Ning Yao Chen Yao Chen Modeling the transport and anisotropy of energetic electrons in solar flares Frontiers in Astronomy and Space Sciences solar flares energetic electrons particle transport solar X-ray emission solar radio emission |
| title | Modeling the transport and anisotropy of energetic electrons in solar flares |
| title_full | Modeling the transport and anisotropy of energetic electrons in solar flares |
| title_fullStr | Modeling the transport and anisotropy of energetic electrons in solar flares |
| title_full_unstemmed | Modeling the transport and anisotropy of energetic electrons in solar flares |
| title_short | Modeling the transport and anisotropy of energetic electrons in solar flares |
| title_sort | modeling the transport and anisotropy of energetic electrons in solar flares |
| topic | solar flares energetic electrons particle transport solar X-ray emission solar radio emission |
| url | https://www.frontiersin.org/articles/10.3389/fspas.2024.1510579/full |
| work_keys_str_mv | AT xiangliangkong modelingthetransportandanisotropyofenergeticelectronsinsolarflares AT xiangliangkong modelingthetransportandanisotropyofenergeticelectronsinsolarflares AT xiangliangkong modelingthetransportandanisotropyofenergeticelectronsinsolarflares AT haoning modelingthetransportandanisotropyofenergeticelectronsinsolarflares AT yaochen modelingthetransportandanisotropyofenergeticelectronsinsolarflares AT yaochen modelingthetransportandanisotropyofenergeticelectronsinsolarflares |