Two mechanisms for dayside polar cap auroral emissions under northward IMF
Jennifer Alyson Carter, University of Leicester, Leicester, LE1, United Kingdom, Steve E Milan, University of Bergen, Birkeland Centre for Space Science, Bergen, Norway, Larry J Paxton, Applied Physics Laboratory Johns Hopkins, Laurel, MD, United States and Alexandra Ruth Fogg, University of Leicester, Department of Physics and Astronomy, Leicester, United Kingdom