Bt is on its way down (thats the strength of the magnetic field, not Bz) as solar wind speeds continue to increase to around 700 km/s. That will put bounds on how low Bz can be. As we enter the fastest part of the high speed solar stream (I THINK were there now because Bt is now dropping), we can still expect some auroras, but since Bz will likely be closer to zero than it was last night and today, the auroral oval is not likely to make much of a southward excursion, so auroras will probably be close to the northern horizon if youre viewing from Great Lakes latitudes. What Ive typically seen in these situations is the occasional appearance of tall columns of auroras with their bases near the horizon. The moon will be bright until it sets around 2:00 AM, but the skies will be clear.
Posted on: Tue, 30 Dec 2014 01:22:10 +0000
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