title: Analyses of Equatorward Auroral Extensions during the Extreme Geomagnetic Storm on 15 July 1959
abstract: Abstract Intense solar eruptions occasionally trigger extreme geomagnetic storms, expand the boundaries of the auroral oval, and facilitate equatorward extensions of the auroral visibility. It is important to analyse such events, to better understand the extremity of space weather and its impact on the technological infrastructure of the modern civilization. However, unlike other extreme geomagnetic storms, little is known about the auroral activity associated with the extreme geomagnetic storm 
journal: Monthly Notices of the Royal Astronomical Society