Spatio-Temporal Variability and Propagation of Equatorial Emissions Below the Local Lower Hybrid Frequency

Details Spatio-Temporal Variability and Propagation of Equatorial Emissions Below the Local Lower Hybrid Frequency Spatio-Temporal Variability and Propagation of Equatorial Emissions Below the Local Lower Hybrid Frequency

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22a0828s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM22A-0828

Physics

2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities

Scientific paper

We report a study of electromagnetic emissions occurring in the vicinity of the geomagnetic equator at frequencies from a few hertz to several hundreds of hertz. High-resolution data were obtained by the Cluster satellites near the perigee of their orbit. The satellites passed nearly perpendicularly through the equator allowing multipoint observations of the waves. We demonstrate a narrow latitudinal extent of the emissions with a typical width of 2 degrees, centered near the minimum-B equator. Power spectra recorded by the different satellites show a complex structure of emission lines whose relative intensities and positions vary at time scales of 1-2 min and/or at spatial scales of tens of wavelengths. We bring observational evidence that the waves propagate with a significant radial component and thus can propagate from a distant generation region located at different radial distances where ion cyclotron frequencies match the observed fine structure.

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