One natural phenomenon I often explain using electromagnetism is the aurora borealis, or northern lights. The aurora is a beautiful natural light display predominantly seen in high-latitude regions around the Arctic and Antarctic. This phenomenon occurs due to interactions between the Earth's magnetic field and charged particles from the solar wind-a stream of charged particles (mostly electrons and protons) emitted by the sun. When these particles reach Earth, they are directed by the planet's magnetic field towards the polar regions, where they collide with atoms in the atmosphere, mainly oxygen and nitrogen. These collisions excite the atoms, causing them to emit light-similar to how a neon sign works. The different colors of the aurora depend on which gases are involved: oxygen emits green and red light, while nitrogen gives off blue and purple hues. Electromagnetism is crucial in this context because it explains both the solar wind's charged particles and the Earth's magnetic field's role in directing them towards the poles. Without the Earth's magnetic field, these charged particles would hit the surface more uniformly, leading to less concentrated displays like the auroras, and exposing us to more harmful solar radiation. The interaction of the magnetic field and solar particles is a perfect example of electromagnetism's influence on natural phenomena. Moreover, the Earth's magnetic field itself is a product of electromagnetism, generated by the movement of molten iron within Earth's outer core. This movement, known as the geodynamo, creates electric currents that produce the magnetic field, which extends into space and forms the magnetosphere-the protective shield that deflects most of the solar wind. When charged particles from the solar wind encounter the magnetosphere, they are guided along the field lines toward the magnetic poles. This interaction between the solar wind and the Earth's magnetic field results in energy being transferred into the atmosphere, leading to the formation of the auroras. Another interesting aspect is the influence of solar activity. During times of increased solar activity, like solar flares or coronal mass ejections (CMEs), the number of charged particles released by the sun increases significantly, leading to more intense auroral displays. This connection between solar activity and auroras again highlights the key role of electromagnetism in this spectacular natural phenomenon.
I wouldn't exactly classify these as natural phenomena, as some electrical involvement was necessary. During an industrial training session at a power plant, we were walking around and noticed strong buzzing noises coming from overhead high-voltage power lines. I theorized that the intense currents were ionizing the surrounding air particles, creating the buzzing sound. Later, we learned that this phenomenon is known as the Corona Effect. The funniest experience, however, was when I found myself "ghost-busting" at a friend's brother's house. They had spotted light orbs on their security cameras at night. Despite being motion-sensitive, the cameras wouldn't record anything, which only heightened their fear of these mysterious orbs. Being my geeky self, I tried explaining that it was a light diffraction phenomenon caused by tiny dust particles picked up by the camera. The breakthrough moment came when someone rubbed their hand on a newly painted wall and noticed dust particles falling off-revealing that this was the source of the "orbs." The relief and laughter that followed were unforgettable. That moment of realization turned fear into hilarity, and the memory of that joyous laugh still lingers.