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AURORAS LOVE EQUINOXES: At this time of year, even a gentle gust of solar wind can spark auroras. NOAA forecasters say that such a gust is coming on Sept. 25th when a stream of solar wind flowing from a minor coronal hole is expected to reach Earth. High-latitude sky watchers should be alert for Northern Lights. Free: Space Weather Alerts

A BEAUTIFUL COINCIDENCE: What are the odds? Catching a lunar rainbow beneath a ribbon of green auroras is rare. Yet it happened twice this week in Iceland. Here is the first time. And here is the second:

"Big rain clouds had been rolling over the whole day with good gaps in between," says photographer Sigurdur William Brynjarsson, who took the picture on Sept. 20th from Reykjanes, Iceland. "The Moon was almost full and aurora activity was picking up. I knew conditions were perfect to capture a lunar rainbow with the Northern Lights together."

"I've never witnessed a lunar rainbow and lady Aurora dancing hand in hand before," he adds. "What a night... =) "

Now that autumn has arrived, rainclouds are mixing with auroras around the Arctic Circle on a regular basis. Those raindrops will turn into snowflakes as winter approaches. Until then, keep an eye on the photo gallery for more moonbows in the Arctic night.

http://spaceweather.com/