Aurora vs Grad Rijeka

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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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Corpus separatum, a Latin term meaning "separated body", refers to the status of the City of Fiume (modern Rijeka, Croatia) while given a special legal and political status different from its environment under the rule of the Kingdom of Hungary. Formally known as City of Fiume and its District (Hungarian: Fiume város és kerülete), it was instituted by Empress Maria Theresa in 1779, determining the semi-autonomous status of Fiume within the Habsburg monarchy until the fall of the Austro-Hungarian Empire in 1918.

Source: Wikipedia