Unlocking the Secrets of Equinox Auroras: Why the Changing Seasons Spark the Most Spectacular Northern Lights

The sun is getting ready to move into the Northern Hemisphere, which means we might soon see some amazing auroras. This will happen around 9:01 UTC (or 5:01 a.m. EDT) on March 20, when the spring equinox takes place.

During the equinox, Earth’s tilt makes the daylight spread more evenly across the planet. From now until the summer solstice in June, the Northern Hemisphere will enjoy longer days. However, this also marks the end of the aurora-watching season for many places north of the equator. Regions close to the Arctic Circle will experience sunrises and sunsets much earlier and later until summer, leaving less time for darkness.

Yet, the spring equinox can offer an exciting chance to witness auroras due to a phenomenon known as the “equinox effect.” Around this time, the way Earth’s axis tilts allows for a better alignment between the solar wind—charged particles from the sun—and Earth’s magnetic field. This can increase the chances of auroral activity, particularly during the equinoxes.

The northern lights form when these charged particles interact with Earth’s magnetic field. During equinoxes, Earth’s magnetic poles align more favorably with the solar wind. This alignment makes it easier for solar particles to enter our atmosphere and create stunning displays of light, according to experts.

Tom Kerss, an aurora researcher, explains that during equinoxes, the relationship between Earth’s magnetic field and the sun’s field becomes more efficient. This means there are more chances for geomagnetic disturbances, which are nearly double in spring and fall compared to other seasons. These disturbances can lead to brighter and more frequent auroras, although visibility also depends on the activity of the sun, which is currently high.

As the equinox approaches, many in northern regions should keep their eyes peeled. The rare beauty of the auroras could create a spectacular visual treat in the twilight skies.