Physics – Plasma Physics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10326495s&link_type=abstract
Journal of Geophysical Research, Volume 103, Issue A11, p. 26495-26506
Physics
Plasma Physics
7
Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Mhd Waves And Instabilities, Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Nonlinear Phenomena
Scientific paper
We undertake a comprehensive study of the extremely low frequency emissions within the magnetopause current layer using measurements obtained with ISEE 1 spacecraft. Since the emissions vary greatly, both spatially and temporally, to derive meaningful and robust statistical results is challenging. We design an averaging procedure and choose the normalized wave amplitudes for a correlation analysis. Also, we separate the parameters for the correlation with local or global properties. We found that most of the wave power in the current layer is carried by the magnetic field fluctuations, while the electric field carries relatively little energy. These emissions are best correlated with the local magnetic field shear and electron plasma beta. The power increases as the shear and beta increase. The wave is correlated with the global interplanetary magnetic field (IMF) clock angle, although it is weaker than with the local shear. The wave is weakly correlated with the IMF Bz and is not correlated with the electron temperature anisotropy. The correlation of the electric wave field with our chosen parameters is weaker than and varying from that of the magnetic wave field. These ELF emissions have the characteristics of the whistler mode dispersion with an increasing phase velocity above the lower hybrid frequency and with a cutoff at the electron cyclotron frequency. The wavelength is ~20 to 100 km. In a case study, the electric field is polarized nearly perpendicular to the background magnetic field.
Anderson Rachel
Gurnett Donald A.
Ogilvie Keith. W.
Russell Christopher T.
Song Paul
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