The correspondence between dayside long-period geomagnetic pulsations and the open-closed field line boundary,
Pilipenko, V. A., O. V. Kozyreva, D. A. Lorentzen, L. J. Baddeley (2018),
J. Atmospheric Solar-Terrestrial Physics, 170 p. 64–74,
10.1016/j.jastp.2018.02.012.