Juno Magnetic Field Investigation
JOI: 4 July 2016 (day-of-year 186)
Juno launch: 5 August 2011 (day-of-year 217)
FGM Turn on: 23 August 2011 (day-of-year 235)
ASC Turn on: 25 August 2011 (day-of-year 237)
Juno spacecraft during launch preparations in Florida.
The two Magnetic Field Experiment (MAG) sensor suites can be seen on
the 4-meter-long dedicated magnetometer boom in the foreground.
The MAG boom is deployed in flight at the outer end of one of the
spacecraft's three solar arrays.
The outboard sensor suite consists of a Fluxgate Magnetometer (FGM)
visible just above the 2 Advanced Stellar Compass (ASC) light baffles
that look outward at a slight angle.
The inboard MAG sensor suit is identical, but rotated 180 degrees and
located 2 meters away.
When deployed, the two sensor suites will be about 10 and 12 meters
from the center of the spacecraft.
The spacecraft is shown in launch configuration with solar arrays and
MAG boom stowed.
Image credit: NASA/JPL-Caltech/LMSS
The Kennedy Media Gallery
has pictures of the pre-launch and launch activities at the Astrotech payload
processing facility in Titusville, Florida and the Cape Canaveral Air Force Station in
Florida. Juno launched on the 5th of August 2011 (doy of year 217) at 12:25 p.m. EDT.
The Juno magnetic fields investigation will provide measurements
of the Jovian magnetic field over a wide dynamic range. The
fundamental objectives of this investigation are to
- map the magnetic field,
- determine the dynamics of Jupiter's interior, and
- determine the three-dimensional structure of the polar
magnetosphere and its auroras.
The magnetic field experiment's sensors are
An Advanced Stellar Compass (ASC) will provide accurate
information about the Juno spacecraft pointing for precise mapping.
Juno ASC Earth Fly By movie
For more information about Juno, please visit