Aurora vs Călărași

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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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Călărași (Romanian pronunciation: [kələˈraʃʲ] (listen), Bulgarian: Кълъраш), the capital of Călărași County in the Muntenia region, is situated in south-east Romania, on the bank of Danube's Borcea branch, at about 12 kilometres (7 miles) from the Bulgarian border and 125 kilometres (78 miles) from Bucharest.

The city is an industrial centre for lumber and paper, food processing, glass manufacturing, textiles, medical equipment production and heavy industry, the last represented by the Călărași steel works. The city is known colloquially as "Capșa provinciei" (the Capșa from the provinces).

Source: Wikipedia