Showing papers by "National Waste & Recycling Association published in 2006"

TL;DR: Based on simultaneous observations of Na density, polar mesosphere summer echoes (PMSE) and noctilucent cloud (NLC) at ALOMAR, Norway (69°N) during the summers of 2001 and 2002, the authors report the strong anti-correlation of sodium atoms with NLC, suggesting that in the presence of large ice particles Na is always absent, and a weaker anti-relation of Na atoms with PMSE, suggest that a population of sub-visible particles also deplete Na to a varied degree.