High-latitude sky watchers should remain alert for auroras in the hours ahead. Solar wind conditions continue to favor geomagnetic activity.
POSSIBLE EARTH-DIRECTED CME: When the current spate of geomagnetic storms is over, another could follow close on its heels. A coronal mass ejection (CME) which occurred during the early hours of June 28th, when magnetic filaments around sunspot AR1777 erupted, is expected to deliver a glancing blow to Earth's magnetic field late on June 30th or early on July 31st. . The explosion registered approximately C4 on the Richter Scale of Solar Flares. Because the CME is not heading squarely toward Earth, there is still a chance that it will miss.
2013 is shaping up to be a good year for NLCs. The clouds surprised researchers by appearing early this year, and many bright displays have already been recorded. Once confined to the Arctic, NLCs have been sighted in recent years as far south as Utah, Colorado, and Nebraska. They might spread even farther south in 2013.
Observing tips: Look west 30 to 60 minutes after sunset when the sun has dipped 6o to 16o below the horizon. If you see luminous blue-white tendrils spreading across the sky, you've probably spotted a noctilucent cloud.