On the multispacecraft determination of periodic surface wave phase speeds and wavelengths

Details On the multispacecraft determination of periodic surface wave phase speeds and wavelengths On the multispacecraft determination of periodic surface wave phase speeds and wavelengths

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11509203f&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A9, CiteID A09203

Physics

Plasma Physics

2

Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Space Plasma Physics: Transport Processes

Scientific paper

Observations of surface waves on the magnetopause indicate a wide range of phase velocities and wavelengths. Their multispacecraft analysis allows a more precise determination of wave characteristics than ever before and reveal shortcomings of approximations to the phase speed that take a predetermined fraction of the magnetosheath speed or the average flow velocity in the boundary layer. We show that time lags between two or more spacecraft can give a qualitative upper estimate, and we confirm the unreliability of flow approximations often used by analyzing a few cases. Using two-point distant magnetic field observations and spectral analysis of the tailward magnetic field component, we propose an alternative method to estimate the wavelength and phase speed at a single spacecraft from a statistical fit to the data at the other site.

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