Saturn & Jupiter's Northern Lights

güttsfükk · #1 ● 04-24-2010, 09:28 PM

Both Jupiter and Saturn have magnetic fields much stronger than Earth's (Jupiter's equatorial field strength is 4.3 gauss, compared to 0.3 gauss for Earth), and both have large radiation belts. Aurora has been observed on both, most clearly with the Hubble Space Telescope. Uranus and Neptune have also been observed to have auroras.

The auroras on the gas giants seem, like Earth's, to be powered by the solar wind. In addition, however, Jupiter's moons, especially Io, are powerful sources of auroras on Jupiter. These arise from electric currents along field lines ("field aligned currents"), generated by a dynamo mechanism due to the relative motion between the rotating planet and the moving moon. Io, which has active volcanism and an ionosphere, is a particularly strong source, and its currents also generate radio emissions, studied since 1955. Auroras have also been observed on Io, Europa, and Ganymede themselves, e.g., using the Hubble Space Telescope. These are generated when Jupiter's magnetospheric plasma impact their very thin atmospheres.

Auroras have also been observed on Venus and Mars. Because Venus has no intrinsic (planetary) magnetic field, Venusian auroras appear as bright and diffuse patches of varying shape and intensity, sometimes distributed across the full planetary disc. Venusian auroras are produced by the impact of electrons originating from the solar wind and precipitating in the night-side atmosphere. An aurora was also detected on Mars, on August 14, 2004, by the SPICAM instrument aboard Mars Express. The aurora was located at Terra Cimmeria, in the region of 177° East, 52° South. The total size of the emission region was about 30 km across, and possibly about 8 km high. By analyzing a map of crustal magnetic anomalies compiled with data from Mars Global Surveyor, scientists observed that the region of the emissions corresponded to an area where the strongest magnetic field is localized. This correlation indicates that the origin of the light emission actually was a flux of electrons moving along the crust magnetic lines and exciting the upper atmosphere of Mars.

Screen saver with jupiter's northern lights (i've not tested it) : http://www.bestfreewaredownload.com/...-lifackzr.html

Jupiter Northern lights Pix :

güttsfükk · #2 ● 04-24-2010, 09:29 PM

Saturn Northern Lights Pix :

güttsfükk · #3 ● 04-24-2010, 09:29 PM

Psychonautical · #4 ● 04-24-2010, 09:31 PM

Ah Gutts, why you gotta be blowing my mind with planetary northern lights. I wish we had high res photos.

güttsfükk · #5 ● 04-24-2010, 09:34 PM

just stumbled across them while reading and found it rather interesting, also saw some vids of the north lights on earth filmed from space stations but nothing in very high quality though...