Statistical phase propagation and dispersion analysis of low frequency waves in the magnetosheath

We present the results of a statistical analysis of low-frequency fluctuations in the high latitude regions of the dayside magnetosheath using CLUSTER as a wave telescope. Magnetic field observations are used to determine wave propagation directions and wave numbers for selected frequencies. Using observations of the plasma flow velocity we correct for the Doppler shift, in order to calculate frequencies and phase velocities in the plasma rest frame. This provides us with the possibility to perform a statistical dispersion analysis and to investigate various wave properties, such as the phase velocity and the propagation angle between k and B . The analysis of dispersion distributions and Friedrichs diagrams results in the identification of different wave populations. We find a multiplicity of standing structures (mirror modes) convected with the plasma flow and a large number of Alfvenic waves. The results confirm previous magnetosheath wave studies, such as ISSE or AMPTE spacecraft observations, but we also find a small number of mirror mode-like waves that have propagation speeds up to the local Alfven velocity, quasi-perpendicular to the magnetic field.

[1]  K. Stasiewicz.  Nonlinear Alfven, magnetosonic, sound, and electron inertial waves in fluid formalism , 2005 .

[2]  K. Stasiewicz.  Reinterpretation of mirror modes as trains of slow magnetosonic solitons , 2004 .

[3]  K. Stasiewicz,et al.  Theory and observations of slow-mode solitons in space plasmas. , 2004, Physical review letters.

[4]  K. Glassmeier,et al.  Alfvén waves in the foreshock propagating upstream in the plasma rest frame: statistics from Cluster observations , 2004 .

[5]  P. Canu,et al.  ULF wave identification in the magnetosheath: The k-filtering technique applied to Cluster II data , 2003 .

[6]  C. Russell,et al.  Long‐wavelength mirror modes in multispecies plasmas with arbitrary distributions , 2002 .

[7]  M. Dunlop,et al.  Dual‐spacecraft observations of standing waves in the magnetosheath , 2001 .

[8]  I. Papamastorakis,et al.  First multispacecraft ion measurements in and near the Earth's magnetosphere with the identical Cluster ion spectrometry (CIS) experiment , 2001 .

[9]  M. Dunlop,et al.  Cluster as a wave telescope - first results from the fluxgate magnetometer , 2001 .

[10]  M. Balikhin,et al.  Drift mirror instability revisited, 1, Cold electron temperature limit , 2001 .

[11]  M. Dunlop,et al.  AMPTE observations of mirror mode waves in the magnetosheath: Wavevector determination , 1999 .

[12]  C. Russell,et al.  Nature, properties, and origin of low‐frequency waves from an oblique shock to the inner magnetosheath , 1998 .

[13]  Mario H. Acuna,et al.  THE CLUSTER MAGNETIC FIELD INVESTIGATION , 1997 .

[14]  Chio Cheng,et al.  Global structure of mirror modes in the magnetosheath , 1996 .

[15]  S. Schwartz,et al.  Low-frequency waves in the Earth’s magnetosheath: present status , 1996 .

[16]  K. Glassmeier,et al.  Wavelength and direction filtering by magnetic measurements at satellite arrays: Generalized minimum variance analysis , 1996 .

[17]  B. Anderson,et al.  Low-frequency fluctuations in the magnetosheath near the magnetopause , 1995 .

[18]  K. Glassmeier,et al.  Mode recognition of MHD wave fields at incomplete dispersion measurements. , 1995 .

[19]  E. Kobel,et al.  A model of the steady state magnetic field in the magnetosheath , 1994 .

[20]  N. Omidi,et al.  Mode properties of low‐frequency waves: Kinetic theory versus Hall‐MHD , 1994 .

[21]  C. Russell,et al.  Identification of low‐frequency fluctuations in the terrestrial magnetosheath , 1994 .

[22]  Brian J. Anderson,et al.  Magnetic spectral signatures in the Earth's magnetosheath and plasma depletion layer , 1994 .

[23]  C. Russell,et al.  Mirror and Alfvénic waves observed by ISEE 1-2 during crossings of the Earth's bow shock , 1992 .

[24]  S. Peter Gary,et al.  The mirror and ion cyclotron anisotropy instabilities , 1992 .

[25]  F. Lefeuvre,et al.  Local characterization of homogeneous turbulence in a space plasma from simultaneous measurements of field components at several points in space , 1991 .

[26]  K. Glassmeier,et al.  Use of an array of satellites as a wave telescope , 1990 .

[27]  H. Lühr,et al.  Ion thermalization in quasi-perpendicular shocks involving reflected ions , 1990 .

[28]  G. Siscoe,et al.  A mechanism for pressure anisotropy and mirror instability in the dayside magnetosheath , 1977 .

[29]  C. Russell,et al.  Fluctuating magnetic fields in the magnetosphere , 1972 .

[30]  A. Hasegawa.  Drift Mirror Instability in the Magnetosphere , 1969 .

[31]  A. Summers,et al.  Hydromagnetic flow around the magnetosphere , 1966 .