EGU25-11571, updated on 15 Mar 2025
https://doi.org/10.5194/egusphere-egu25-11571
EGU General Assembly 2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Solar wind turbulent fluctuations within the kinetic range of scales
Olga Alexandrova1, Dusan Jovanovic2, Petr Hellinger3, Pascal Demoulin1, Milan Maksimovic1, Stuart Bale4, and Andre Mangeney1
Olga Alexandrova et al.
  • 1LIRA, Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CY Cergy Paris Université, CNRS, 92190 Meudon, France
  • 2Institute of Physics, University Belgrade, Pregrevica 118, 11080 Belgrade, Serbia
  • 3Astronomical Institute, Boční II 1401, Prague CZ-141 00, Czech Republic
  • 4Space Science Laboratory, University of California, Berkeley, CA, USA

Electromagnetic fluctuations in the solar wind cover a wide range of scales, from sun-rotation period to sub-electron scales. We study Cluster Guest Investigator data when 2 satellites were at 7 km distance, that corresponds to few electron Larmor radius. We find a typical spectral shape within the kinetic range and signatures of intermittency up to electron scales. Local analysis of magnetic fluctuations at electron scales indicates presence of vortex-like coherent structures, which can be interpreted in terms of electron scale Alfven vortices. We discuss a possible connection of these small-scale vortices with coherent structures at ion scales. The results at 1 au will be compared with spectral properties and coherent structures at kinetic scales observed by Parker Solar Probe closer to the Sun.

How to cite: Alexandrova, O., Jovanovic, D., Hellinger, P., Demoulin, P., Maksimovic, M., Bale, S., and Mangeney, A.: Solar wind turbulent fluctuations within the kinetic range of scales, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-11571, https://doi.org/10.5194/egusphere-egu25-11571, 2025.