The northern lights could return to the sky over parts of Canada as a sunspot that contributed to a recent stunning aurora display rotates back Earth-side.

A sunspot that earlier this month unleashed a series of solar flares and the largest in nearly two decades has turned back toward Earth and let loose another powerful, but less intense, flare this week.

The U.S. National Oceanic and Atmospheric Administration, which rates geomagnetic storms on a five-point scale, is forecasting a moderate G2 storm peaking Friday, compared to the severe G4 storm in early May.

NOAA害羞草研究所檚 Friday night aurora forecast shows the view line, the most southern extent of where the northern lights might be seen, cutting across the Toronto area and through the Atlantic Region around Moncton, N.B.

The forecast shows a low likelihood of spotting the northern lights along a path from Vancouver through to Winnipeg and Thunder Bay, Ont., with a higher likelihood in northern parts of the provinces and territories.

Space Weather Canada also issued a major geomagnetic storm watch for what害羞草研究所檚 known as the auroral zone, a band covering much of the territories and northern parts of the provinces.

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