Note for skywatchers in northern latitudes:

The gse-aa listserv, based at the University of Alaska, sent out the following alert today:

Passage of Earth through the solar wind neutral sheet on the 16th
produced some auroral activity seen in the northern tier of states in
the US and in Northern Europe now (1900 UT). There should be
continued activity tonight (9/17), and on the 18th, tapering off by
the weekend.

If you're in a northern clime and happen to be outdoors tonight or tomorrow night, Keep Looking Up. (Insert deedily-deedily-deedily Jack Horkheimer theme music here.)