Direct measurements of the Poynting flux associated with convection electric fields in the magnetosphere

Details Direct measurements of the Poynting flux associated with convection electric fields in the magnetosphere Direct measurements of the Poynting flux associated with convection electric fields in the magnetosphere

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11512212n&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A12, CiteID A12212

Physics

2

Magnetospheric Physics: Electric Fields (2411), Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Magnetosphere: Outer

Scientific paper

Observations of Poynting fluxes associated with onset of convection electric fields are essential for understanding of electromagnetic energy transport from the solar wind toward the magnetosphere leading to changes in the convection electric field, which is one of the most fundamental parameters in the magnetosphere-ionosphere coupled system. We present Cluster multispacecraft observations of Poynting fluxes associated with abrupt changes in large-scale electric fields during sudden commencements and southward turning of the interplanetary magnetic field (IMF). The Cluster spacecraft detected Poynting fluxes dominated by the field-aligned upward component during the preliminary impulse of sudden commencements and in the initial period after southward turning of the IMF. The upward Poynting flux indicates existence of Alfvén waves transporting electromagnetic energy from the ionosphere toward the magnetosphere leading to magnetospheric convection changes. The waveguide model and global magnetohydrodynamic (MHD) simulation calculating evolution of the Poynting flux following solar wind pressure enhancements also show upward Poynting fluxes propagating from the ionosphere toward the magnetosphere faster than the propagation of compressional waves. We conclude that the ionosphere acts as a channel to transmit electromagnetic energy supplied as field-aligned currents toward a wide region in the magnetosphere-ionosphere system instantaneously, leading to changes in magnetospheric convection electric fields.

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