Aurora vs Luleå

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An aurora (plural: auroras or aurorae), sometimes referred to as polar lights (aurora polaris), northern lights (aurora borealis), or southern lights (aurora australis), is a natural light display in the Earth's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic). Auroras are the result of disturbances in the magnetosphere caused by solar wind. These disturbances are sometimes strong enough to alter the trajectories of charged particles in both solar wind and magnetospheric plasma. These particles, mainly electrons and protons, precipitate into the upper atmosphere (thermosphere/exosphere).

The resulting ionization and excitation of atmospheric constituents emit light of varying color and complexity. The form of the aurora, occurring within bands around both polar regions, is also dependent on the amount of acceleration imparted to the precipitating particles. Precipitating protons generally produce optical emissions as incident hydrogen atoms after gaining electrons from the atmosphere. Proton auroras are usually observed at lower latitudes.

Source: Wikipedia

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Luleå ( LOO-lay-oh, Swedish: [ˈlʉ̌ːlɛɔ] (listen), locally [ˈlʉ̌ːlɛ] (listen); Westrobothnian: Lul, Leul, or Leol [²lʉːɽ], locally [²lewɽ]; Lule Sami: Luleju) is a city on the coast of northern Sweden, and the capital of Norrbotten County, the northernmost county in Sweden. Luleå has 48,728 inhabitants in its urban core (2018) and is the seat of Luleå Municipality (with a total population of 77,832). Luleå is Sweden's 25th largest city and Norbotten County's largest city.

Luleå has the seventh biggest harbour in Sweden for shipping goods. It has a large steel industry and is a centre for extensive research. Luleå University of Technology is one of Sweden's three technology universities (the other two are KTH and Chalmers) and the northernmost university in Sweden. The university has approximately 15,000 students.

Source: Wikipedia