Motions of the Convection Reversal Boundary and Local Plasma in the High-Latitude Ionosphere



Journal Title

Journal ISSN

Volume Title


Amer Geophysical Union


We present results from a systematic study of multisatellite samplings from the Defense Meteorological Satellite Program F13, F15, F16, F17, and F18 satellites over the period from 2007 to 2015 that describe the motion of the convection reversal boundary (CRB) and the local plasma flow across it. Focusing on the cases with continuous poleward and equatorward CRB motion sampled by three consecutive satellites within 50 min, 45% of the time the CRB motion may deviate from the local plasma motion near dawn and dusk where the reconnection process is unlikely to be present. Differences in the inferred CRB motion and the local plasma motion may arise from apparent motion induced by the local time displacement of consecutive samples across the CRB that is tilted with respect to a line of constant latitude. The presence of a viscous- like interaction across the CRB can also contribute to the difference in the CRB and plasma motion. Accounting for these processes, the CRB motion and the motion of the plasma at the CRB are consistent only if a back and forth motion over a timescale of a few minutes is superimposed on a monotonic migration of the CRB over longer time periods.



Interplanetary magnetic fields, Solar wind, Magnetosphere, Ionosphere

This work is supported by NASA grant NNX14AF33G and by AFOSR MURI grant FA9559-16-1-0364


©2018 American Geophysical Union. All Rights Reserved.