Northern Lights Visible in 9 States Tonight Due to Solar Flare

The Northern Lights are forecast to be visible in parts of nine U.S. states on June 29 and 30, following a solar flare event. The National Oceanic and Atmospheric Administration's (NOAA) Space Weather Prediction Center predicts a K-index of 5 for Thursday and Friday, indicating that the aurora will be bright and observable. The K-index, or KP, measures the magnitude of geomagnetic storms and serves as an indicator of disturbances to Earth's magnetic field.

Viewing of the aurora is typically best between 10 pm and 2 am local time. NOAA advises observers to head towards the magnetic poles for the most visible displays. The states where the Northern Lights are likely to appear include Washington, Idaho, Montana, North Dakota, and South Dakota. In the Midwest, visibility is expected in northern Minnesota, Wisconsin, and Michigan, with Alaska also being a potential viewing location.

The current aurora event is attributed to a coronal mass ejection (CME) associated with a solar flare that occurred on June 30. A CME is an expulsion of solar material and magnetic fields from the sun, capable of generating geomagnetic storms that lead to auroras. NOAA describes a CME as approximately one billion tons of plasma ejected from the sun at speeds of one million miles per hour. When such an event reaches Earth, it can trigger significant geomagnetic storms, resulting in vivid auroral activity. Interested individuals can monitor the NOAA's website for the latest updates on the aurora forecast.