Simultaneous Observation of Chorus Waves Going Back and Forth in the Magnetosphere by the CLUSTER Satellites

Details Simultaneous Observation of Chorus Waves Going Back and Forth in the Magnetosphere by the CLUSTER Satellites Simultaneous Observation of Chorus Waves Going Back and Forth in the Magnetosphere by the CLUSTER Satellites

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72a0597p&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM72A-0597

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2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities

Scientific paper

This paper is related to the propagation characteristics of a chorus emission recorded simultaneously by the 4 satellites of the CLUSTER mission on October 29, 2001 between 0100 and 0500 UT. During this day, the spacecraft (SC) 1, 2, and 4 are relatively close to each other but SC3 has been delayed by half an hour. We use the data recorded aboard CLUSTER by the STAFF spectrum analyser. This instrument provides the cross spectral matrix of three magnetic and two electric field components. This spectral matrix is processed by a dedicated software in order to determine the wave normal directions relatively to the Earth's magnetic field. This calculation is done for the 4 satellites at different times and different frequencies and allows us to check the directions of these waves. It is shown that the parallel component of the Poynting vector changes its direction when the satellites cross the magnetic equator which indicates that the chorus waves propagate away from the equator. This is valid for the most intense waves observed on the magnetic and electric power spectrograms. But it is also observed on SC1, SC2, and SC4 that lower intensity waves propagate toward the equator simultaneously with the SC3 intense chorus waves propagating away from the equator. Both waves are at the same frequency. Using the wave normal directions of these waves, a ray tracing study shows that the waves observed by SC1, SC2, and SC4 are the same waves which are observed by SC3. Their origin in the equatorial plane is similar. SC3 which is 30 minutes late observes the waves which originate first from the equator, meanwhile SC1, SC2, and SC4 observe the same waves which have suffered a Lower Hybrid Resonance (LHR) reflection at low altitudes and now return to the equator at a different location with a lower intensity. Similar phenomenon is observed when the SCs are on the other side of the perigee. The intensity ratio between magnetic waves coming directly from the equator and waves returning to the equator is between 0.005 and 0.01 which is in agreement with previously published theoretical calculation of the growth rates with the particle distribution seen by GEOS.

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