Page 8: Research news on aurora

Aurora is a geomagnetic and atmospheric optical phenomenon arising from the interaction of charged particles, primarily electrons and protons from the solar wind and magnetospheric plasma, with atoms and molecules in a planet’s upper atmosphere. Guided by magnetic field lines into high-latitude auroral ovals, these particles precipitate and undergo collisional excitation and ionization of atmospheric species such as oxygen and nitrogen. Subsequent radiative de-excitation produces characteristic emissions, notably green and red lines of atomic oxygen and molecular nitrogen bands, forming dynamic structures including arcs, curtains, and patches whose morphology and intensity are modulated by magnetospheric dynamics and space weather conditions.