Sieradz vs Aurora

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Sieradz [ˈɕerat͡s] (listen) (Latin: Syradia, German: 1941-45 Schieratz) is a town on the Warta river in central Poland with 42,762 inhabitants (2016). It is situated in the Łódź Voivodeship (since 1999), but was previously the eponymous capital of the Sieradz Voivodeship (1975–1998), and historically one of the minor duchies in Greater Poland.

It is one of the oldest towns in Poland, thrice being a location for the coronation of the Polish monarchs. The town was attacked by the Tartars, Bohemians and Teutonic Knights. Polish Kings chaired six assemblies from here.

Source: Wikipedia

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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