Widespread Electrostatic ion Cyclotron/ ion Acoustic Turbulence Above Auroral Acceleration Region; CLUSTER Observations

Details Widespread Electrostatic ion Cyclotron/ ion Acoustic Turbulence Above Auroral Acceleration Region; CLUSTER Observations Widespread Electrostatic ion Cyclotron/ ion Acoustic Turbulence Above Auroral Acceleration Region; CLUSTER Observations

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41b0567b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM41B-0567

Physics

2471 Plasma Waves And Instabilities, 2483 Wave/Particle Interactions, 2487 Wave Propagation (6934), 2704 Auroral Phenomena (2407), 2772 Plasma Waves And Instabilities

Scientific paper

We present CLUSTER observations based on a study of broadband ELF emissions above the auroral oval at altitudes around ˜ 4.5 RE. The study focuses on the parallel electric field with the aim to identify the different emissions involved. We have found different emissions sorted by the ratio δ E∥ /δ Eperpendicular to . No associated magnetic field component has been detected indicating electrostatic emissions. The numerical package WHAMP, solving the dispersion relation, shows that all emissions exist on the so-called ion acoustic dispersion surface, but with different wave vectors. For the event presented here, we have also identified dispersive Alfvén waves at lower frequencies with a period well correlated with the most intensive emissions in the broadband region, which indicate that dispersive Alfvén waves can trigger the electrostatic emissions at frequencies above the proton gyrofrequency.

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