Two clouds in contrast against a background sky, illuminated by the near infrared emission induced by OH molecules in the upperatmosphere... This nightglow is due to OH molecule radiation in the upperatmosphere (at an altitude of around 84 km)... This radiation interests upperatmosphere specialists to the extent that, once identified, it indicates an atmospheric layer that can change with atmospheric conditions: gravity waves, temperature variations, etc
Onera? s accelerometers also made it possible to learn more about the upperatmosphere, up to the end... This data, transmitted to the ground station, will allow a better knowledge of the air density distribution in the upperatmosphere, up to an altitude of 154 km, where the instrument was turned off due to saturated measurements