Scientific journal publication Observation of 27 day solar cycles in the production and mesospheric descent of EPP-produced NO. Hendrickx, K.; Megner, L.; Gumbel, J.; Siskind, D.E.; Orsolini, Y.J.; Nesse Tyssøy, H.; Hervig, M. Publication details Journal: J. Geophys. Res. Space Phys., 120, 8978–8988, 2015 DOI: 10.1002/2015JA021441