Aurora is the optical manifestation of energetic particles that penetrate a planet's atmosphere from the space above the atmosphere. Aurora occurs on both hemispheres on Earth at high latitudes, but is also found on other planets.
Sites on science, observation, and images of aurora and similar topics are suitable for this category.
Sun-Earth interaction is manifested in solar radiation interacting with Earth's upper atmosphere, and solar wind which interacts with the Earth's magnetic field and Earth's plasma environment. Sun-Earth interaction leads to space weather. It includes studies of the sun, the solar atmosphere, the solar wind, the geospace environment, and the upper atmosphere. A spectacular example of Sun-Earth interaction is the aurora.
Sites on solar physics, solar wind, magnetosphere, ionosphere, upper atmosphere, space plasma, space weather, and similar topics are suitable for this category. Particularly suitable are sites that combine several of the listed topics.