Data collected on the behavior of the planet has given scientist the strong belief that contained within the ice of the planet lays a deep flowing ocean. The atmosphere at Europa in the present analysis is atomic oxygen at a density two orders of magnitude below the previous O 2 dominated model. Callisto is about 1.8 times farther from Jupiter than Ganymede, 2.8 times farther than Europa and 4.5 times farther than Io, Jupiter’s closest large moon. Europa does have an atmosphere, although tenuous. Europa is tidally locked, so the same side faces Jupiter at all times. The presence of a Europa atmosphere was first reported by Hall et al. Europa's ionosphere has a maximum density of 10,000 electrons per cubic centimeter, which is significantly lower than the average density of 20,000 to 250,000 electrons per cubic centimeter found in Jupiter's ionosphere.

The Galileo mission discovered something amazing! Size: Europa is 1,900 miles (3,100 km) in diameter, making it smaller than Earth's moon, but larger than Pluto. Io was the first Jupiter satellite to be suspected of having an atmosphere. This atmosphere is created when fast moving molecules in Jupiter's magnetosphere hit the surface of Europa and knock out a water molecule. The observation when no ionosphere was detected—E6a exit (Fig. Located 490 million miles (780 million kilometers) from the Sun, Europa's surface is too cold, measured at -230 degrees Fahrenheit (-145 degrees Celsius), to support life as we know it. Proposals have been made to send a robotic submarine to Europa to see if there might be life there. Europa's ionosphere has a maximum density of 10,000 electrons per cubic centimeter, which is significantly lower than the average density of 20,000 to 250,000 electrons per cubic centimeter found in Jupiter's ionosphere.

Europa has a thin atmosphere which is primarily made from oxygen. Europa’s average surface temperature is -160 °C (or −260 °F) which keeps the moon’s icy surface frozen and as hard as granite. Unlike Earth, where organisms generate and maintain a 21% oxygen atmosphere, Europa's oxygen atmosphere is produced by purely non-biological processes. that the Europa atmosphere is composed of H 2O products (Ip 1996;Ipetal.1998; Smyth & Marconi 2006). Expeditions to Europa Facts. With a mean density of 3.013 ± 0.005 g/cm 3, Europa is significantly less dense than any of the other Galilean Moons. 1) Pioneer 10 measured an ionosphere (Kliore et al 1974) with a peak density of about 60000 e - /cm 3 . Europa has its own atmosphere, although it is very, very thin. The authors’ conclusion also highlights how much we do not know about the environment at Europa, while pointing to a helpful tool for planning purposes on future missions: Large uncertainties remain in the properties (density profile, 3D structure, temporal variability…) of Europa’s tenuous atmosphere and plumes (Plainaki et al., 2018). Unlike our atmosphere, the oxygen in Europa's atmosphere is likely not produced biologically. Previous investigations proved the existence of local density enhancements in Europa’s atmosphere, advancing the idea of a possible origination from … The surface pressure of Europa's atmosphere is 0.1 micro Pascals, or 10-12 times that of the Earth. This atmosphere is composed solely of oxygen. (1995) with detection of atomic oxygen through the Oi 3P–3s 3S o and P–3s 5S o multiplet transitions at ∼1304 and ∼1356Å. The electron density profiles show the presence of ionization in the Europa atmosphere in five of the six measurements. Europa, a satellite of Jupiter, appears to have an ocean beneath its icy surface. These molecules may float around Europa for awhile, but because of Europa's weak gravity, the "atmosphere" rapidly drifts away. The heterogeneous hot component of the magnetospheric plasma deposits most of the energy required to maintain the Io plasma torus.