what causes northern lights to appear

The northern lights appear when charged particles from the Sun slam into gases in Earth’s upper atmosphere along the planet’s magnetic field lines, causing those gases to glow as shimmering curtains of light. In other words, they are a giant natural neon sign powered by the solar wind and guided by Earth’s magnetic field.

Quick Scoop

• Main cause: Streams of charged particles (mostly electrons and protons) flow out from the Sun as the solar wind and from stronger events like solar flares or coronal mass ejections. When these flows are intense and pointed toward Earth, auroras become brighter and can be seen farther from the poles.

• Magnetic funnel: Earth’s magnetic field acts like an invisible funnel, steering many of these particles toward the polar regions rather than letting them hit everywhere evenly. This is why the northern lights cluster in an “auroral oval” around the Arctic, with a southern twin around Antarctica.

• Atmosphere lighting up: High above Earth, typically from about 80 to over 200 kilometers up, the incoming particles collide with atoms and molecules of oxygen and nitrogen, exciting them so that they release energy as visible light. Different gases and altitudes produce different colors, with green common from oxygen and red or purplish tones linked to both oxygen and nitrogen.

In simple terms: the Sun sends charged particles, Earth’s magnetic field herds them toward the poles, and our atmosphere glows when those particles crash into it.

Information gathered from public forums or data available on the internet and portrayed here.