Dynamics of the polar F-region during a magnetic storm Original Research Article

F-region dynamics in the central polar cap region are being routinely monitored from an observatory at Eureka, Canada (89° CGL) using photometric and imaging devices and a Fabry-Perot Interferometer measuring neutral winds from OI 6300 Å emissions. A case study is presented of a magnetic storm on December 30, 1997 during which winds increased to 500 m/s then rapidly decreased to 100 m/s when IMF Bz switched northward and a sustained polar aurora was triggered.