Pulsations observed during high-speed flow in the ionosphere

Details Pulsations observed during high-speed flow in the ionosphere Pulsations observed during high-speed flow in the ionosphere

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9312883w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Nov. 1, 1988, p. 12883-12891.

Physics

7

Auroral Zones, Convective Flow, E Region, Flow Velocity, Ionospheric Disturbances, Current Density, Polarization (Waves), Pulse Amplitude, Radar Measurement, Wave Propagation

Scientific paper

Pulsation signals detected in the E region ionospheric convection flow with the Sweden and Britain auroral radar experiment radar are described. Large amplitude oscillatory signals were detected, localized to a region of approximate dimension 300 km in the north-south direction and 100 km in the east-west direction. The spectral characteristics of the signals show the presence of linearly polarized waves propagating westward with an apparent horizontal phase speed of 8 km/s. The pulsations occur at a time when the background flow is changing and, in particular, are located next to a region where a sheet of high vertical vorticity develops. The oscillatory signal contains field-aligned current colocated with the vorticity in the background flow. Vertical current density is of order 10 to the -6th A/sq m. It is proposed that the pulsations are system transients excited in response to flow reconfiguration in the magnetosphere. Spacecraft data are shown indicating that magnetopause flux transfer event activity was occurring in the same local time sector at the time of the events reported here.

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