Just got back from looking at some pretty weird northern lights. A bright teardrop-shaped patch glowed alone low in the northwestern sky around 10:30-11 p.m. 10 minutes later, another oval patch mysteriously appeared in the north. The two swelled in size and length and almost appeared to join … but didn’t . Instead, the teardrop faded away while the oval brightened. Then it slowly disappeared. When I last looked, the oval had returned but was fainter.
To look at the aurora indicators we’ve tapped into the past few nights — the Kp index and auroral oval — you’d think there’d be no reason to don hat and coat and go aurora-hunting on cold, windy night. Both indicators are nearly flat, having dropped from minor storm level during the late afternoon (CDT). Yet Earth magnetic bubble keeps on jiggling, shaking out some peculiar forms of aurora.
One hint that solar excitement still lingers in Earth’s vicinity comes from the live information sent to us by the Advanced Composition Explorer (ACE) satellite, which taps into the Sun’s wind a million miles upstream of our planet. Around 10:30 p.m. (CDT), ACE recorded a southward dip in the magnetic field embedded in the solar wind – perfect for linking into Earth’s field and firing up auroras.
As always, it’s hard to know how long these “glows” may last, but if you’re out, don’t be surprised if you see them. We’re now at five nights in a row and counting for northern lights displays this week. Looks like we’re in for more. The forecast calls for yet another G1 geomagnetic storm Saturday evening (March 21) from about 7-10 p.m. CDT.