  We present a technique for creating a longitude-resolved image of Jupiter's
thermal radio emission. The technique has been applied to VLA data taken on 25
January 1996 at a wavelength of 2 cm. A comparison with infrared data shows a
good correlation between radio hot spots and the 5 micron hot spots seen on
IRTF images. The brightest spot on the radio image is most likely the hot spot
through which the Galileo probe entered Jupiter's atmosphere. We derived the
ammonia abundance (= volume mixing ratio) in the hot spot, which is ~ 3 x
10^{-5}, about half that seen in longitude-averaged images of the NEB, or less
than 1/3 of the longitude-averaged ammonia abundance in the EZ. This low
ammonia abundance probably extends down to at least the 4 bar level.

Astrophysics