Summer Solstice: Northern summer and southern winter begin today, June 20th, at precisely 23:59 UT (7:59 pm EDT) when the sun ascends to its highest latitude on the celestial sphere: +23.5o. In the Northern Hemisphere, we have the longest day and shortest night of the year, and the reverse in the Southern Hemisphere. The seasons are changing--Happy Solstice!

Intense NLCs: Summer is the season for noctilucent clouds and this morning, right on cue, a wave of bright NLCs rolled over the British Isles. "The display appeared quite suddenly ... probably the brightest I've ever seen," reports Paul Evans of Larne, Northern Ireland. Nearby Maghaberry resident John C McConnell snapped this picture of the clouds at daybreak:

noctilucent clouds
©John C McConnell


"The clouds were so bright, they would have been spotted by members of the public with even a casual glance," adds Martin McKenna who watched the show from Maghera, Northern Ireland. "Glowing tendrils seemed to change size and shape by the minute with subtle colours such as electric blue, orange, and even green. I couldn't take my eyes away from it."

As regular readers know, these glow-in-the-dark clouds are a 100+ year old mystery under investigation by NASA's AIM spacecraft. Once confined to arctic latitudes, noctilucent clouds have been spreading with recent sightings in the USA as far south as Utah, Colorado and possibly even Virginia. Check the photo gallery for observing tips and be alert for noctilucent clouds!