Smith-Johnsen, C., Marsh, D.R., Orsolini, Y., Nesse Tyssøy, H., Hendrickx, K., Sandanger, M.I., Ødegaard, L-K., G., Stordal, F., Nitric oxide response to the April 2010 electron precipitation event, HEPPA-SOLARIS, Virginia, US, June, 2018 (Invited talk)