A magnetic boundary signature within flux transfer events

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Geomagnetism, Magnetic Flux, Magnetic Signatures, Magnetopause, Magnetospheric Electron Density, Satellite Observation, Ampte (Satellites), Canonical Forms, Transfer Functions

Scientific paper

High-resolution AMPTE-UKS data are presented for a FTE signature in the magnetosphere. When the observations are confronted with the canonical model for such events, it is found that the existence of the two field regions (draping vs twisting) predicted from the model can be clearly substantiated. In addition to these regions there is a separate, distinct region close to the expected boundary between open and closed field lines which is estimated to be of order ten ion gyroradii thick. This region is distinguished by a distinctive field and particle signature. The magnetic signature has not been reported before, but the electron signature bears a close resemblance to the electron heat flow layer reported in the ISEE data by Scudder et al. (1984). Other observations reported are the occurrence of large flow burst and, in the central region of the FTE signature, the presence of magnetic field oscillations of period about 3 s.

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