However, most pilots require 60â70 hours of flight time to complete training. The minimum age for a private pilot certificate is 16 for balloons and gliders, and 17 for powered flight (airplanes, helicopters, and gyroplanes). Pilots can begin training at any age and can solo balloons and gliders at age 14, powered aircraft at age 16.
A corona (Latin, ' crown ') is an aura of plasma that surrounds the sun and other celestial bodies. The Sun's corona extends millions of kilometres into space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph.The word corona is a Latin word meaning crown, from the Ancient Greek ÎºÎ¿ÏÏÎ½Î· (korÅnÄ, âgarland, wreathâ).The high temperature of the Sun's corona gives it unusual spectral features, which led some in the 19th century to suggest that it contained a previously unknown element,  coronium .he Coulomb logarithm is roughly 20 in the corona, with a mean temperature of 1 MK and a density of 10 15 particles/m 3, and about 10 in the chromosphere, where the temperature is approximately 10kK and the particle density is of the order of 10 18 particles/m 3, and in practice it can be assumed constant.
In Mexico, Nena is used as a nickname for Elena and Magdalena, as well as for girls who have the same name as their mother. Meanings and history of the name Nena: | Edit. Nena comes from the Hebrew Magdalena. The meaning is of Magdela. In Aztec mythology it is the name of one of the first two humans: Nata and Nena. It also means girl in Spanish (not to be confused with Nina which means baby) and is an endearing name for a daughter.