Strong hydromagnetic fluctuations in the Comet P/Halley magnetosphere observed by the Giotto magnetic field experimentStrong hydromagnetic fluctuations were observed in the induced magnetosphere of comet Halley. Several regions were identified showing either strong turbulence, characterized by the absence of strong fluctuations, or showing isolated, quasi-coherent wave trains above a turbulent background. Visual inspection of the wave trains shows no preferred sense of polarization, i.e., they may be of transverse, compressional, or mixed polarization. Spectral analysis shows peak power at various frequencies, corresponding, for example, to water group or hydrogen ion cyclotron resonances. Analysis of a peculiar type of oscillation with 25 sec period suggests strong contributions from off-angle propagating waves.
Document ID
19870017314
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Glassmeier, K. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Neubauer, F. M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Acuna, M. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Marian, F. (Rome Univ. Italy)
Date Acquired
September 5, 2013
Publication Date
December 1, 1986
Publication Information
Publication: ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters