Determination of dispersion relations in quasi-stationary plasma turbulence using dual satellite data

International audienceThe joint frequency-wavenumber spectrum is one of day 304 of 1984. This data set has already been discussed in the basic quantities for analyzing plasma turbulence. It is shown how the full spectrum can be recovered from wavefields measured by two or more satellites via spectral methods based on wavelet transforms. Compared to standard cross-correlation techniques, different branches in the dispersion relation can be resolved and quasi-stationary wavefields can be accessed. Using this new approach, low frequency magnetic field data from the [Schwartz et al., 1992; Mann et al., 1994]. The turbulence in the foreshock region reveals a great variety of wave phenomena, among which solitary structures termed Short Large Amplitude Magnetic Structures (SLAMS) [Schwartz et al., 1992] have received much attention. The SLAMS, which are a subset of more general pulsations [Thomson et al., 1990] and which are related to kinetic magnetosonic waves [Omidi et al., 1990] and to AMPTE-UKS and AMPTE-IRM spacecraft are investigated and soliton Alfv6n waves [Hada et al., 1989], try to propagate the impact of nonlinear processes on wave propagation at the Earth's foreshock is revealed