MAD at Jupiter: Study of Jupiter's upper atmosphere with the Multi-Conjugate Adaptive Optics Demonstrator at the VLT/YEPUN F. Marchis (UC Berkeley) Jupiter was imaged during the Science Demonstration of the MCAO Demonstrator (MAD) at the European Southern Observatory's Very Large Telescope. A brief review of the system and its characteristics will be discussed. This is the first time an image of an extended object was obtained with this prototype. Io and Europa were used as natural guide stars on either side of Jupiter, separated from each other by about 1.6 arcmin from 23:41 to 01:32 UT (2008 Aug 16/17). The corrected angular resolution was 90 milli-arcsec across the entire field of view, as measured on background stars. The observations in K, Kc, and BrG filters were sensitive to portions of the Jovian spectrum with strong methane and hydrogen absorption. The data probe the upper troposphere, which is populated with a fine (~0.5 micrometer) haze. The upper tropospheric haze is enhanced over Jupiter's equatorial region. Haze reflectivity peaked in the northern equatorial region in HST/NICMOS data from 2005 and Keck/NIRC2 data from 2006, but the 2008 MAD images show a peak in the southern equatorial region. Comparison between this southward shift and dramatic changes in the underlying cloud cover (part of the 2006/2007 global upheaval) provide insights into the dominant source mechanism controlling the haze distribution.