  To investigate the internal structure of the magnetopause with spacecraft
data, it is crucial to be able to determine its normal direction and to convert
the measured time series into spatial profiles. We propose here a new
single-spacecraft method, called the BV method, to reach these two objectives.
Its name indicates that the method uses a combination of the magnetic field (B)
and velocity (V) data. The method is tested on simulation and Cluster data, and
a short overview of the possible products is given. We discuss its assumptions
and show that it can bring a valuable improvement with respect to previous
methods.
