Würzburg 2018 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 1: Near Earth Space
EP 1.2: Vortrag
Montag, 19. März 2018, 17:00–17:15, BSZ - Pabel HS
The Evolution of Turbulence behind the Terrestrial Bow Shock — •Gerrit Meinhardt, Joachim Saur, and Anne Schreiner — Institut für Geophysik und Meteorologie, Universität zu Köln
Using measurements from the Cluster spacecraft which investigate the Earth’s magnetic environment and its interaction with the solar wind plasma, we study turbulence of magnetic fluctuations inside the Earth’s magnetosheath. In the solar wind, power spectral densities of magnetic fluctuations follow a Kolmogorov scaling of f−5/3 at MHD scales. Power spectral densities inside the magnetosheath were found to scale differently (close to f−1) in most observations. We analyze 32 magnetosheath crossings of Cluster in different regions of the Earth’s environment. We observe spectral slopes close to -1 as well as close to -5/3 which change with distance from the magnetosheath boundaries. We investigate the processes that lead to the evolution of turbulence in the inertial range of the turbulent cascade and the transition from a scaling with f−1 to a Kolmogorov scaling.