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Revealing evolution of nonthermal electrons in solar flares using 3D modeling

This study presents a 3D modeling approach to investigate the evolution of nonthermal electrons in solar flares. The study utilizes an open-source IDL implementation, GX Simulator, which allows for the import of chromospheric and coronal models, as well as the generation of data-driven models and maps. The study also highlights the development of a fast gyrosynchrotron code that enables realistic 3D modeling and practical forward fitting. The findings provide insights into the resonance stochastic acceleration of nonthermal electrons by whistler turbulence in flaring loops. These results have implications for understanding the source parameters and emission mechanisms of flares.

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Revealing evolution of nonthermal electrons in solar flares using 3D modeling

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  1. Revealing evolution of nonthermal electrons in solar flares using 3D modeling Gregory D. Fleishman1, Gelu M. Nita1*, Natsuha Kuroda1, Sabina Jia2, Kevin Tong2, Richard R. Wen2, Zhou Zhizhuo2 1New Jersey Institute of Technology 2Union County Magnet High School

  2. GX Simulator 3D Modeling PackageNita, Fleishman, Kuznetsov, Kontar, & Gary 2015, ApJ 799, 236 Nita, Viall, Klimchuk, Loukitcheva, Gary, Kuznetsov, & Fleishman, 2018 ApJ 853, 66  • Open-source IDL implementation running on Windows, Unix and Mac platforms distributed through SolarSoftWare (SSW) repository • Ability to import numerically defined chromospheric and coronal models • Integrated tools for generating data-driven chromospheric and coronal models • Integrated tools for building and populating magnetic field loops • Generation of Microwave, EUV, and X-ray maps based on the combined chromospheric and coronal models

  3. Fast Gyrosynchrotron Codes • Fleishman & Kuznetsov (2010) developed a new, efficient, and precise algorithm and implemented it into publicly available libraries for fast calculation of gyrosynchrotron spectra—enabling realistic, bulk 3D modeling and practical forward fitting. • This algorithm consists of extending the approximations by Petrosian (1981) and Klein (1987) and making them far more accurate and more widely applicable, e.g., for the anisotropic case. • The calculations were made more accurate and applicable by finding an accurate Gaussian approximation of the integrand over the pitch angle. • The calculations were also made more accurate and widely applicable by melding exact calculations at low harmonics with approximate calculations at high harmonics. • The gain is several orders of magnitude in computation speed.

  4. High-School Summer Internship ProgramGregory Fleishman & Gelu Nita2016-2017-2018 2017 Mid-Atlantic Section American Physics Society Meeting

  5. Integration Research with Education A high school students, Richard Wen, summarized his summer experience as follows: “…the research program I attended under your guidance was one of the largest projects I have ever done. It was the first time I felt that I really contributed to something much greater than myself. I also found it to be an invaluable learning experience. … This internship provided me with a rare and unique opportunity to practice both independence and cooperation to a scale that I had never even imagined myself to experience until well after high school. Sincerely, Richard Wen.” A high school student, Sabina Jia, is presenting her summer project at 2017 MAS APS meeting on Nov 4 2017, at NJIT.

  6. SOL2002-04-12T17:42

  7. Electron Acceleration in a Coronal Thick-target FlareFleishman, G. D.; Nita, G.M.; Kuroda, N.; Jia, S.; Tong, K.; Wen, R. R.; Zhizhuo, Z. 2018, ApJ 859,17

  8. 3D Nonthermal Electrons Evolution Emin

  9. Fleishman et al. 2018 Conclusions SOL2002-04-12T17:42 Dense Flare The resonant stochastic acceleration of the nonthermal electrons by whistler turbulence in the dense flaring loop offers a consistent interpretation of the source parameter evolution recovered from the 3D modeling

  10. Fleishman et al. 2018 Conclusions SOL2002-04-12T17:42 Dense Flare The co-spatial decimetric component is interpreted as being produced by the RTR emission mechanism due to interaction between non-thermal electrons and small-scale density fluctuations, likely generated by the same whistler turbulence.

  11. Fleishman et al. 2018 Conclusions SOL2002-04-12T17:42 Dense Flare • The resonant stochastic acceleration of the nonthermal electrons by whistler turbulence in the dense flaring loop offers a consistent interpretation of the source parameter evolution recovered from the 3D modeling • The co-spatial decimetric component is interpreted as being produced by the RTR emission mechanism due to interaction between non-thermal electrons and small-scale density fluctuations, likely generated by the same whistler turbulence.

  12. “Three-dimensional Forward-fit Modeling of the Hard X-Ray and Microwave Emissions of the 2015 June 22 M6.5 Flare” Kuroda t a. 2018, ApJ, 852 (1), 3 MW emission required the two distinct loops contributing in different frequency ranges

  13. Nonthermal e evolution in 3D

  14. Recovered evolution of nonthermal electron in the SOL2015-06-22T17:50

  15. Fleishman et al. 2018 Conclusions SOL2015-06-22T17:50 Large Tenuous Flux Tube Strong diffusion due wave-particle interaction

  16. Thank You!

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