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LONG RANGE AURORA FORECAST: On Oct. 7th and 8th, a high-speed stream of solar wind hit Earth’s magnetic field, sparking strong geomagnetic storms and auroras. On Nov. 2nd – 5th, it could happen again. The same solar wind stream that caused the October storms is set to return during the first week of November. It is flowing from a coronal hole in the sun’s atmosphere: http://spaceweather.com/images2015/28oct15/ch.jpg?PHPSESSID=7pbhuu26eahj5ctv5bvodfarv3
The last time this particular coronal hole turned toward Earth, in early October, it lashed our planet’s magnetic field with an 800 km/s solar wind stream. Now it is turning toward Earth again. Aurora fans, mark your calendar for the first week of November.
SOLAR SECTOR BOUNDARY CROSSING: High-latitude auroras are possible on Oct. 29th when Earth crosses through a fold in the heliospheric current sheet. https://en.wikipedia.org/wiki/Heliospheric_current_sheet
This is called a “solar sector boundary crossing,” and NOAA forecasters estimate a 30% chance of polar geomagnetic storms when it occurs. http://spaceweather.com/
These images were taken by the Helioviewer.org and SDO solar spacecraft. http://helioviewer.org/
Image credit: NASA