Canadians may witness a stunning northern lights show tonight as the sun released fast-moving particles towards Earth. Lately, the sun has been active, emitting magnetic energy and three coronal mass ejections (CMEs). These CMEs are rapidly traveling through the solar wind towards our planet and might combine to form a “cannibal” CME.
When these particles interact with Earth’s magnetic field, they create the mesmerizing phenomenon known as the northern lights or aurora borealis. While these lights are typically visible in northern regions, a strong CME could extend their reach further south. An example of this was the prominent northern lights display on May 10, 2024, visible as far south as the Caribbean due to a cannibal CME.
The Space Weather Prediction Center (SWPC) of the National Oceanic and Atmospheric Administration anticipates a potent geomagnetic storm tonight and into Friday. These storms are categorized on a scale from G1 to G5, with the SWPC forecasting potential G3 storm levels following the combined CME arrival around mid-afternoon EDT on June 4.
Predicting the northern lights occurrence is challenging, but the SWPC expresses reasonable confidence in their arrival while remaining uncertain about their intensity. The SWPC suggests that G3 storm levels are most likely, with a chance of G4, whereas the intense displays in May and October 2024 resulted from G5 storm levels.
To catch a glimpse of the northern lights, certain conditions must align, including the southern dip of the auroral hole where the CME particles travel and darkness during the storm. Seeking darker skies away from city lights enhances visibility, and using a phone to capture photographs is recommended. Looking toward the north is advised, especially for those in southern regions like southern Ontario, although during past powerful storms, the lights were visible even in the southern sky.
For real-time updates on aurora visibility, apps like Aurora Now can provide location-specific information. Additionally, after sunset, a spectacular conjunction of Jupiter and Venus can be observed by looking to the west.