Artículos de revistas
On the multispacecraft determination of periodic surface wave phase speeds and wavelengths
Fecha
2010-09Registro en:
Foullon, C.; Farrugia, C. J.; Fazakerley, A. N.; Owen, C. J.; Gratton, Fausto Tulio Livio; et al.; On the multispacecraft determination of periodic surface wave phase speeds and wavelengths; Blackwell Publishing Ltd; Journal of Geophysical Research: Space Physics; 115; 9; 9-2010; 1-8
2169-9402
CONICET Digital
CONICET
Autor
Foullon, C.
Farrugia, C. J.
Fazakerley, A. N.
Owen, C. J.
Gratton, Fausto Tulio Livio
Torbert, R.
Resumen
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. Copyright 2010 by the American Geophysical Union.