reformation after, eclipse with Jupiter. High-resolution images of Io acquired when Io is experiencing an eclipse reveal an aurora-like glow. As on Earth, this is due to particle radiation hitting the atmosphere, though in this case the charged particles come from Jupiter's magnetic field rather than the solar wind. Aurorae usually occur near the magnetic poles of planets, but Io's are brightest near its equator. Io lacks an intrinsic magnetic field of its own; therefore, electrons traveling along Jupiter's magnetic field near Io directly impact Io's atmosphere. More electrons collide with its atmosphere, producing the brightest aurora, where the field lines are tangent to Io (i.e. near the equator), because the column of gas they pass through is longest there. Aurorae associated with these tangent points on Io are observed to rock with the changing orientation of Jupiter's tilted magnetic dipole. Fainter aurora from oxygen atoms along the limb of Io (the red glows in the image at right), and sodium atoms on Io's night-side (the green glows in the same image) have also been observed. See also Exploration of Io Jupiter Jupiter's moons in fiction List of natural satellites Planetary geology References External links General information Io profile at NASA's Solar System Exploration site Bill Arnett's Io webpage from The Nine Planets website Io overview from the University of Michigan's Windows to the Universe Calvin Hamilton's Io page from the Views of the Solar System website Movies Paul Schenk's 3D images and flyover videos of Io and other outer solar system satellites High resolution video simulation of rotating Io by Seán Doran Images Catalog of NASA images of Io Galileo images of Io New Horizons images of Io New Horizons LORRI Raw Images, includes numerous Io images Io through Different New Horizons Imagers Maps Io global basemaps at the USGS Astrogeology Science Center based on Galileo and Voyager images Io nomenclature and map with feature names from the USGS planetary nomenclature page Interactive map of Io by Google Maps Additional references Io dynamo from educational website The Exploration of the Earth's Magnetosphere NASA's Stunning Discoveries on Jupiter's Largest Moons | Our Solar System's Moons The Conundrum Posed by Io's Minimum Surface Temperatures Io Mountain Database Cassini Observations of Io's Visible Aurorae at the USGS Astrogeology Science Center The Gish Bar Times, Jason Perry's Io-related blog Articles containing video clips 16100107 Discoveries by Galileo Galilei Moons of Jupiter Moons with