Is the Source of Chorus Emissions Located at the Local Geomagnetic Field Minimum?

Details Is the Source of Chorus Emissions Located at the Local Geomagnetic Field Minimum? Is the Source of Chorus Emissions Located at the Local Geomagnetic Field Minimum?

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1704a&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1704

Physics

[2774] Magnetospheric Physics / Radiation Belts, [6984] Radio Science / Waves In Plasma

Scientific paper

Discrete ELF/VLF chorus emissions are the most intense electromagnetic plasma waves that are observed in the Earth's radiation belts and outer magnetosphere. These waves are supposed to propagate roughly along magnetic field lines from a localized source region near the magnetic equator towards the magnetic poles. It is known that the local minimum of the geomagnetic field (on the given L-shell) is situated near the geomagnetic equator but can move away from it during periods of strong geomagnetic perturbations. This displacement can be as large as ± 10° in geomagnetic latitude. Under quiet conditions, this position can be estimated by making use of magnetic field models. During periods of intense geomagnetic activity, however, the magnetic field minimum can be substantially displaced from its quiet position and also can have rather complicated fine structure, with, for instance, more than one local minimum. From the analysis of the Poynting vector directivity for chorus waves (based on Cluster data), we show that there are sources associated with different local minima. Multi-point magnetic field measurements strongly suggest that the velocity of these minima is close to that of fast magnetosonic waves. The evaluation of the position of the sources of chorus waves suggests that these are colocated with the minima in the magnetic field. This study was financially supported by CNES.

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