NOAA projected Saturday night’s northern lights would have a Kp index of 3, a measure of the aurora’s strength on a scale of ...

A Kp index of five was recorded Sunday night and early Monday after “isolated periods” of geomagnetic storms created by ...

If the Kp index increases to four, similar forecasts push the view line into South Dakota, and areas in northern Maine may have an opportunity to view aurora borealis. (See view line below.) ...

NOAA projected lights for Wednesday night with a Kp index of 4, a measure of strength on a scale ... Other states that fall ...