FIGURE 1. Chandra X-ray Observatory image of Jupiter on 18 December 2000.

False colour brightnesses are indicated in rayleighs (R). The observation lasted 10 h (10–20 UT) and each X-ray photon has been smeared by double the 0.4-arcsecond full-width half-maximum point-spread-function of the high-resolution camera. A jovicentric graticule with 30° intervals is overplotted, along with the maximum equatorward extent of the L = 5.9 (orange lines) and L = 30 (green lines) footprints of the VIP4 model¹⁶ magnetosphere. The auroral emissions are located at much higher latitudes than we expected on the basis of previous X-ray observations and indicate a connection with Jupiter's outer magnetosphere. An animation showing the time dependence of these observations may be viewed at http://pluto.space.swri.edu/yosemite/jupiter/chandra_hrc.html.