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SUMMARY:Saturn’s Internal Magnetic Field Revealed by Cassini Grand Final
 e - Hao Cao (Harvard University)
DTSTART:20180305T140000Z
DTEND:20180305T150000Z
UID:TALK100069@talks.cam.ac.uk
CONTACT:Dr. Yufeng Lin
DESCRIPTION:Saturn’s intrinsic magnetic field continues to offer surpris
 es since the first in-situ measurements during the Pioneer 11 Saturn flyby
 . The Cassini spacecraft\nentered the Grand Finale phase in April 2017\, d
 uring which time the spacecraft dived through the gap between Saturn’s a
 tmosphere and the inner edge of the D-ring 22 times before descending into
  the deep atmosphere of\nSaturn on Sep. 15 th 2017. The unprecedented prox
 imity to Saturn (reaching ~2550 +/- 1290 km above the cloud deck) and the 
 highly inclined nature of the Grand Finale orbits provided an ideal opport
 unity to decode Saturn’s internal magnetic field. The fluxgate magnetome
 ter onboard Cassini made precise in-situ vector magnetic field measurement
 s during the Grand Finale phase. Magnetic signals from the interior of the
  planet and various magnetospheric currents were observed during the Grand
  Finale phase. Here we will report new features of Saturn’s internal mag
 netic field revealed by measurements\nfrom the Cassini Grand Finale phase.
  We will show the directly determined\nnorthward offset of Saturn’s magn
 etic equator and it variations. Small-scale\nyet highly consistent magneti
 c structures were detected along every Grand\nFinale orbits. When expresse
 d in spectral space\, intrinsic magnetic moments\nup to at least degree 9 
 are needed to describe these magnetic structures.\nImplications for the de
 ep interior of Saturn will be discussed.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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