Dayside High Latitude Ground Magnetic Pulsations Produced by Kelvin-Helmholtz Waves at the Convection Shear Boundary: Conjugate Northern and Southern Observations

Abstract:

A very strong convection shear reversal boundary can be observed at high latitudes on the dayside particularly during periods of strong IMF By. This shear boundary can create the Kelvin-Helmholtz instability and produce a series of continuous ionospheric travelling convection vortices. We present here observations of continuous traveling convection vortices observed simultaneously by the Greenland west coast magnetometer chain and a conjugate chain deployed in the Antarctic. We also analyze the geomagnetic pulsations related to the continuous ionospheric travelling convection with wavelet filters. The characteristic parameters of the events, such as spectrum, amplitude, phase difference, and others, are discussed with the solar wind diving conditions associated with them, as well as the asymmetry between the two hemisphere.