IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
A new method to determine the boundary of magnetic clouds
Autor/es:
DASSO S.; DEMOULIN P.; MANDRINI C.H.; LUONI, M.L.
Lugar:
Beijing, China.
Reunión:
Conferencia; 36th COSPAR Scientific Assembly. Held 16 - 23 July 2006, in Beijing, China.,; 2006
Institución organizadora:
COSPAR
Resumen:
Magnetic clouds MCs are transient structures formed by magnetic flux
ropes with low proton temperature and strongly enhanced magnetic field
intensity with respect to ambient values The identification of the MC
boundaries is an open question for some clouds mainly because different
proxies can provide different positions In this paper we analyze the
magnetic cloud observed by the spacecraft Wind on October 18-20 1995 a
cloud previously studied by several authors The front of this cloud
seems to be relatively well determined from plasma and magnetic data
However different authors set the rear boundary at different times We
present a new method that determines the centre and the rear boundary of
a flux rope when the front boundary is well known It is based on the
azimuthal magnetic flux conservation We deduce that the leading flux of
the analyzed magnetic cloud had reconnected with the overtaken
solar-wind magnetic field Then we estimate the magnetic flux associated
with the full cloud before it reconnects with the solar wind Finally we
evaluate the sensitivity of our results using different models methods
and magnetic-cloud boundaries applied to the same magnetic cloud data