Rietveld, Michael T.; Nesse, H.; Heinrich, D.; Williams, B.; Hoppe, Ulf-Peter; Stadsnes, J.; Singer, W.; Blum, U.; Sandanger, M. I.; Trondsen, E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2008-05-28)
Several possible mechanisms for the production of
sporadic sodium layers have been discussed in the literature,
but none of them seem to explain all the accumulated observations.
The hypotheses range from direct meteoric input,
to energetic electron bombardment on meteoric smoke particles,
to ion neutralization, to temperature dependent chemistry.
The varied instrumentation located on Andøya ...