Response of the quiet auroral arc motion to ionospheric convection variations

Details Response of the quiet auroral arc motion to ionospheric convection variations Response of the quiet auroral arc motion to ionospheric convection variations

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10621463k&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A10, p. 21463-21474

Physics

1

Ionosphere, Ionosphere: Electric Fields, Ionosphere: Plasma Convection, Magnetospheric Physics: Auroral Phenomena

Scientific paper

Equatorward motion of quiet auroral arcs was studied together with the F region ionospheric plasma drift observed by the European Incoherent Scatter radar in Tromsø. Variations in the arc velocity lagged behind corresponding variations in the ionospheric convection velocity by 5-9 min. The same result was obtained from comparison of the arc velocity with variations in the eastward component of ground magnetic field. The variations in the arc and plasma drift velocities followed interplanetary magnetic field Bz variations. The observations indicate that the dawn-dusk electric potential difference arises at the open polar cap magnetic field lines due to the solar wind-magnetosphere interaction and then propagates to the closed magnetotail field lines through the ionosphere.

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