What is the Kp index?
The Kp index measures auroral activity on a scale of nine. A higher Kp index indicates the aurora will be visible farther from the poles.
Science / Space
The aurora borealis, or Northern Lights, may be visible in several states along the Canadian border. Increased solar activity makes this a prime viewing opportunity, though some radio blackouts are possible.
The National Oceanic and Atmospheric Administration (NOAA) has updated its forecasts, indicating that the Northern Lights may be visible in parts of northeastern Washington, northern Idaho, northern Montana, North Dakota, South Dakota, northern Minnesota, northern Wisconsin, Upper Michigan, and Maine.
The best viewing times are typically between 10 p.m. and 2 a.m. local time. To maximize visibility, it's recommended to find a north-facing, high vantage point away from city lights and light pollution.
The increased visibility is attributed to the sun reaching a solar maximum, a peak in its 11-year cycle. This has led to more frequent and intense displays of the aurora borealis. NASA and NOAA scientists expect this peak to persist into early 2026.
Historically, the strongest geomagnetic storm in two decades occurred in May 2024, bringing the aurora as far south as Texas and northern Florida. These events are caused by electrons from solar flares and coronal mass ejections interacting with oxygen and nitrogen in Earth’s atmosphere.
The Kp index measures auroral activity on a scale of nine. A higher Kp index indicates the aurora will be visible farther from the poles.
Strong solar flares can disrupt high-frequency radio communications, leading to radio blackouts.
Use a wide-angle lens, an F-stop of four or less, and focus set to the furthest possible setting. For smartphones, use night mode, disable flash, and lower the shutter speed.
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