SOLAR FLARE AND CME: Big sunspot AR2473 erupted on Dec.
28th, producing an M1.9-class solar flare, a minor radio blackout in
the southern hemisphere, and a coronal mass ejection (CME) that appears
to be heading directly for Earth. This explosion sets the stage for
possible geomagnetic storms later this week when the CME reaches our
planet. Visit Spaceweather.com for more information.
POLAR STRATOSPHERIC CLOUDS: For the second time this
month, Arctic sky watchers are reporting a rare outbreak of
super-colorful polar stratospheric clouds (PSCs). Photos and observing
tips are featured on today's edition of Spaceweather.com