Aurora vs Teresina

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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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Teresina is the capital and most populous municipality in the Brazilian state of Piauí. Being located in north-central Piauí 366 km from the coast, it is the only capital in the Brazilian Northeast that is not located on the shores of the Atlantic Ocean. With 861,442 inhabitants, Teresina is the 21st largest city in Brazil, and the 15th largest state capital in the country. Together with Timon in the nearby state of Maranhão, it forms a conurbation with a population of about 953,172 inhabitants; the entire metropolitan region of Teresina has over 1,135,920 inhabitants. The only natural barrier that separates Teresina from Timon is the Parnaíba river, one of the largest in the Northeast.

Teresina is the capital with the second best quality of life in the North-Northeast according to FIRJAN. According to IPEA, Teresina is the third safest capital of Brazil (only after Natal and Palmas). It is also among the 50 cities in the world with the highest murder rates, with 315 homicides in 2017.Its motto is the Latin phrase Omnia in Charitatis, which means, in English, "All for charity". The city is the birthplace of, among others, Torquato Neto, who belonged to the Tropicalismo movement. Its Cathedral Catedral Metropolitana Nossa Senhora das Dores, dedicated to Our Lady of Sorrows, is the archiepiscopal see of the Roman Catholic Archdiocese of Teresina.

Source: Wikipedia