Why the Northern Lights Connect the Sun and Earth

What an aurora tells you

An aurora is not weather lightning: it is light produced high in Earth's atmosphere. The Sun supplies energy and charged particles, while Earth's magnetic field guides some of them toward polar regions. There, they excite gases that later release light.

How to plan a viewing

1. Choose a dark, preferably clear night and a spot away from bright city lights.
2. Check a current aurora forecast and local cloud cover before travelling.
3. At high northern latitudes, watch the sky toward the north.

A report of strong solar wind does not guarantee that an aurora will be visible from your location. Clouds, daylight, location, and actual activity all matter too.

Why the colours appear

The incoming particles transfer energy to oxygen and nitrogen in the upper atmosphere. As those gases return to a lower-energy state, they emit light. The colour depends partly on which gas is involved and how high the interaction occurs. That is the useful connection: the glow makes activity between the Sun, Earth's magnetic field, and the atmosphere visible.

Keep expectations realistic

Auroras are most often seen at high latitudes and during strong solar activity, but a clear night alone is not enough. NASA Space Place explains the mechanism; to decide whether to go out tonight, also use a current forecast. Outside polar regions, visible displays are less likely.