Juno magnetometer observations constrain Jupiter’s dynamo, interior state, deep zonal flow, and planetary rotation rate. 

<p>The Juno spacecraft, in orbit about Jupiter since 2016, continues to map Jupiter&#8217;s magnetic field<strong> </strong>with ever increasing resolution in space and time.<strong> </strong>The &#8220;JRM33&#8221; spherical harmonic model of the field, based on the first 32 orbits of the Prime Mission, is well fit by a Lowes' spectrum with a dynamo core radius of 0.807 +/- 0.006 Rj, identified with the outer radius of the convective metallic hydrogen region that exists beneath a layer stably stratified by the precipitation of &#8220;helium rain&#8221;. Observations near the equatorial magnetic anomaly known as the Great Blue Spot (GBS) are consistent with the (few cm/s) eastward drift of the GBS and provide evidence of advection of the magnetic field by deep (few 1000 km) zonal winds. Magnetic field observations during Juno&#8217;s 6 years in orbit, as well as those acquired in past decades by Voyager and Ulysses spacecrafts, evidence a secular westward drift of the main dipole in longitude (of 0.11 degrees/yr from Juno observations, 0.09 degrees/year estimated from earlier flybys) suggesting a more accurate rotation period for the deep interior</p>