FARWEST: Efficient Computation of Wave-Particle Interactions for a Dynamic Description of the Electron Radiation Belt Diffusion

0562738 - ÚFA 2023 RIV US eng J - Journal Article
Dahmen, N. - Sicard, A. - Brunet, A. - Santolík, Ondřej - Pierrard, V. - Botek, E. - Darrouzet, F. - Katsavrias, C.
FARWEST: Efficient Computation of Wave-Particle Interactions for a Dynamic Description of the Electron Radiation Belt Diffusion.
Journal of Geophysical Research-Space Physics. Roč. 127, č. 10 (2022), č. článku e2022JA030518. ISSN 2169-9380. E-ISSN 2169-9402
EU Projects: European Commission(XE) 870437 - SafeSpace
Institutional support: RVO:68378289
Keywords : radiation belts * wave particle interaction * diffusion equation * data assimilation * cold plasma density * magnetospheric VLF waves
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.8, year: 2022
Method of publishing: Open access
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JA030518

In this paper, we present a new method to compute rapidly, wave particle interaction induced pitch angle and momentum diffusion coefficients. Those terms are normally obtained by the numerical solving of equations based on the quasi-linear theory. However, this bulk resolution leads to a high computational cost, preventing the integration of plasma density and VLF waves nowcasts and forecasts. Therefore, and in the context of the SAFESPACE project (H2020), we implemented a new wave particle interaction code called FARWEST (FAst Radiation diffusion with Waves ESTimator), with an efficient interpolation based method. The proposed implementation was validated against reference results obtained by WAPI, ONERA's wave particle interaction legacy code, with a substantial reduction of the computing time while conserving the physical accuracy of the generated coefficients. The FARWEST code is later used to measure the impact of a time-dependent plasma density distribution (numerically computed by BIRA's plasmaspheric model SPM) on the coefficients and on the representation of the electron flux map by Salammbo, ONERA's radiation belt code.
Permanent Link: https://hdl.handle.net/11104/0335035