ARLA/CLUSTER: O problema dos francesas em relação aos radioamadores está descoberto: "O Céu Cai-lhe em Cima da Cabeça"

[João Costa > CT1FBF]

Anomalous noctilucent clouds over Paris

On the first night of northern summer, many Parisians were stunned
when the midnight sky over the Eiffel Tower turned electric blue.

It was the glow of noctilucent clouds (NLCs). The same clouds appeared
in the USA a few nights later near Las Vegas, Salt Lake City, and Los
Angeles.

New data from NASA's satellite-based Microwave Limb Sounder explain
these anomalous sightings: As June comes to an end, the mesosphere
remains unusually wet at middle latitudes, creating rare conditions
for the formation of NLCs.

Visit Spaceweather.com for data and observing tips.