The AGU Chapman Conference 2023 international conference aims to bring together scientists to review and discuss the current status of research on Alfvén waves in space plasmas, including the solar atmosphere, the solar wind, planetary magnetospheres and ionospheres, and laboratory plasmas (if relevant to space plasmas). Participants had the opportunity to interact and exchange knowledge and ideas with scientists from various communities in a collegial setting.
The overarching themes of Alfvén wave research, regardless of what system they occur in, are:
- Alfvén wave generation mechanisms
- Alfvén wave propagation and coupling
- Alfvén wave interactions with plasma and energetic particles
- Alfvén wave applications in solar system plasmas
See also our conference paper (Macek & Wójcik, 2023)!
References
2023
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Markov Analysis of Magnetic Turbulence on Kinetic Scales Based on MMS Data
AGU Chapman Conference, May 2023
Based on the THEMIS mission in the Earth’s magnetosheath, we have verified that turbulence at shocks is well described by inward- and outward-propagating Alfvén waves. Recently, we have also presented results of statistical analysis of magnetic field fluctuations in the magnetosheath using the data from the Magnetospheric Multiscale (MMS) mission on extremely small kinetic scales. We have shown that magnetic turbulence exhibits features characteristic for Markov processes. It is interesting to note that on kinetic scales the turbulence cascade is consistent with a generalized Ornstein-Uhlenbeck process. The solutions of the Fokker-Planck equation agree with experimental probability density functions, from the kappa distributions to the normal Gaussian distribution for large inertial scales, which exhibit a universal global scale invariance of the collapsing PDFs through the kinetic domain. Here we compare the characteristics of turbulence at various regions in Earth’s space environment: behind the bow shock, inside the magnetosheath, and near the magnetopause. The obtained results especially on kinetic scales may be important for a better understanding of the physical mechanism governing turbulent systems in laboratory and space plasmas.