No nitrate spikes detectable in several polar ice cores following the largest known solar events

Mekhaldi, F., McConnell, J. R., Adolphi, F., Arienzo, M. M., Chellman, N. J., Maselli, O. J., Sigl, M., Muscheler, R. (2017). No nitrate spikes detectable in several polar ice cores following the largest known solar events, Geophysical Research Abstracts, 19