  We present the results of two XMM-Newton observations of Jupiter carried out
in 2003 for 100 and 250 ks (or 3 and 7 planet rotations) respectively. X-ray
images from the EPIC CCD cameras show prominent emission from the auroral
regions in the 0.2 - 2.0 keV band: the spectra are well modelled by a
combination of emission lines, including most prominently those of highly
ionised oxygen (OVII and OVIII). In addition, and for the first time,
XMM-Newton reveals the presence in both aurorae of a higher energy component (3
- 7 keV) which is well described by an electron bremsstrahlung spectrum. This
component is found to be variable in flux and spectral shape during the Nov.
2003 observation, which corresponded to an extended period of intense solar
activity. Emission from the equatorial regions of Jupiter's disk is also
observed, with a spectrum consistent with that of solar X-rays scattered in the
planet's upper atmosphere. Jupiter's X-rays are spectrally resolved with the
RGS which clearly separates the prominent OVII contribution of the aurorae from
the OVIII, FeXVII and MgXI lines, originating in the low-latitude disk regions
of the planet.
