Just ready for the New Year. Seen in Norway. The other kind of fireworks.
Post Scriptum. It turned around we were lucky to see a green ribbon dancing in the sky on our first day in Norway. In the following days we barely saw some green lights in the sky with a naked eye. Only our cameras were able to detect the green particles. We realised presence of a green ribbon only after having seen final photographs. Forecasts we followed turned around far fetched even with the sky clear.
For most days we saw communiques like ‘go’ and ‘try’ but there was absolutely nothing green in the sky even if checked with a professional photo camera. After many hours ride on one day we only lost time and in aftermath the whole day. Why? Because my fellows trusted a web page, an unreliable one. With my patience lost, I finally compared the web pages as I would do it doing a regular academic search of sources. Most of those pages are in fact run by private people, who do not gather any original data. They rely on an US governmental service. So I visited the original source and compared the content. Even with good weather we were not supposed to see anything. According to Americans, the indices (KP) were that low that at our latitude (corresponding to KP 2) nothing should be seen in the skies and even if something was there for a moment only very sensitive camera on long exposure would see something green in the skies. With an naked eye even in the dark it would not be possible. So, a short advice: if in Northern Norway under KP 2 – if you want to see a dancing green ribbon – do not assume you would see it below KP=4-5. With a naked eye you will sea something green in the sky on KP=3-4.