S. Schäfer
Braunschweig University of Technology
8 Papers
78 Citations
S. Schäfer is an academic researcher from Braunschweig University of Technology. The author has contributed to research in topics: Field line & Alfvén wave. The author has an hindex of 8, co-authored 8 publications.
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Papers
Spatial and temporal characteristics of poloidal waves in the terrestrial plasmasphere : a CLUSTER case study
S. Schäfer,Karl-Heinz Glassmeier,P. T. I. Eriksson,Viviane Pierrard,Karl-Heinz Fornacon,Lars Blomberg +5 more
TL;DR: In this paper, a large scale configuration formed by the four CLUSTER spacecraft is used to detect a poloidal Ultra-Low-Frequency (ULF) pulsation of the magnetic and electric field in order to analyze its temporal and spatial structures.
Spatio-temporal structure of a poloidal Alfvén wave detected by Cluster adjacent to the dayside plasmapause
S. Schäfer,Karl-Heinz Glassmeier,P. T. I. Eriksson,Pavel N. Mager,Viviane Pierrard,Karl-Heinz Fornacon,Lars Blomberg +6 more
TL;DR: In this article, a case study of a poloidal ULF pulsation near the dayside plasmapause is presented based on cluster observations of magnetic and electric fields, where the pulsation is detected close to the magnetic equatorial plane at L shells L =[4.4, 4.6] and oscillates with a frequency of f =23 mHz.
Field-aligned structure of poloidal Alfvén waves in a finite pressure plasma
TL;DR: In this article, the parallel structure of poloidal Alfven waves in a finite pressure plasma is studied and the effects of finite-beta plasma are especially essential near the magnetospheric equator, where an opaque (non-transparent) region for Alfven wave can be formed.
Field line distribution of density at L =4.8 inferred from observations by CLUSTER
Richard E. Denton,P. Décréau,Mark J. Engebretson,Fabien Darrouzet,J. L. Posch,C. G. Mouikis,L. M. Kistler,Cynthia A Cattell,Kazue Takahashi,S. Schäfer,Jerry Goldstein +10 more
TL;DR: In this article, the field line distribution of mass density ρ was inferred from Alfven wave harmonic frequencies and compared to the electron density ne from plasma wave data and the oxygen density nO+ from the ion composition experiment.
Statistical phase propagation and dispersion analysis of low frequency waves in the magnetosheath
S. Schäfer,Karl-Heinz Glassmeier,Yasuhito Narita,Karl-Heinz Fornacon,Iannis Dandouras,Markus Fränz +5 more
TL;DR: In this paper, the results of a statistical analysis of low-frequency fluctuations in the high latitude regions of the dayside magnetosheath using CLUSTER as a wave telescope are presented.