G. E. Bower. Statistical analysis of northward IMF phenomena, transpolar arcs and horse collar aurora. April, University of Leicester  2023 .

G. E. Bower, S. E. Milan, L. J. Paxton, E. Spanswick, and M. R. Hairston. Formation and Motion of Horse Collar Aurora Events. Journal of Geophysical Research: Space Physics, volume 128, issue 5, April  2023 .