Cluster observations of reflected EMIC‐triggered emission

On 19 March 2001, the Cluster fleet recorded an electromagnetic rising tone on the nightside of the plasmasphere. The emission was found to propagate toward the Earth and toward the magnetic equator at a group velocity of about 200 km/s. The Poynting vector is mainly oblique to the background magnet...

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Bibliographic Details
Published in:Geophysical research letters 2016-05, Vol.43 (9), p.4164-4171
Main Authors: Grison, B., Darrouzet, F., Santolík, O., Cornilleau‐Wehrlin, N., Masson, A.
Format: Article
Language:English
Subjects:
Astrophysics
Clusters
Cyclotrons
Earth
Electromagnetics
EMIC
Emission
Emission analysis
Emissions
Equator
Geophysics
Group velocity
Ion cyclotron waves
Magnetic equator
Magnetic field
Magnetic fields
Physics
Plasma Physics
Plasmapause
Plasmasphere
Ray tracing
Reflection
Sciences of the Universe
Slopes
triggered emission
Wave reflection
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Summary:On 19 March 2001, the Cluster fleet recorded an electromagnetic rising tone on the nightside of the plasmasphere. The emission was found to propagate toward the Earth and toward the magnetic equator at a group velocity of about 200 km/s. The Poynting vector is mainly oblique to the background magnetic field and directed toward the Earth. The propagation angle θk,B0 becomes more oblique with increasing magnetic latitude. Inside each rising tone θk,B0 is more field aligned for higher frequencies. Comparing our results to previous ray tracing analysis we conclude that this emission is a triggered electromagnetic ion cyclotron (EMIC) wave generated at the nightside plasmapause. We detect the wave just after its reflection in the plasmasphere. The reflection makes the tone slope shallower. This process can contribute to the formation of pearl pulsations. Key Points Multispacecraft observations of a reflected EMIC‐triggered emission The reflection makes the rising tone slope shallower High abundance of O+ ions is required to match the group velocity observations
ISSN:0094-8276
1944-8007
DOI:10.1002/2016GL069096