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SUMMARY:Magnetic Perspective on the Interior of Saturn (Invited speaker) -
  Michele Dougherty (Imperial College London)
DTSTART:20220913T101500Z
DTEND:20220913T110000Z
UID:TALK177485@talks.cam.ac.uk
DESCRIPTION:Co-Author\, Hao Cao\nMagnetic fields are windows into planetar
 y interiors and Saturn&rsquo\;s internal magnetic field following the Cass
 ini Grand Finale orbital phase continues to surprise us.&nbsp\; The unique
  geometry of these orbits provided an opportunity to measure the internal 
 magnetic field at closer distances to the planet than ever encountered bef
 ore. The surprising close alignment of Saturn&rsquo\;s magnetic axis with 
 its spin axis (known about since the early Pioneer 11 observations) has be
 en confirmed\, however external effects\, observed even around closest app
 roach are masking some of the magnetic field signals from the interior. Th
 e varying northern and southern magnetospheric planetary period oscillatio
 ns and field aligned currents at both high and low latitudes are contribut
 ing to the magnetic signals observed. We show the directly determined nort
 hward offset of Saturn&rsquo\;s magnetic equator and its &ldquo\;longitudi
 nal&rdquo\; variations\, small-scale yet highly consistent magnetic struct
 ures along the latitudinal direction detected along every Grand Finale orb
 it. Observational constraints on the electromagnetic induction response fr
 om the semi-conducting region and time variation of Saturn&rsquo\;s intern
 al magnetic field will also be presented. We will discuss how these latest
  measurements provide a new perspective on answering some key questions co
 ncerning Saturn&rsquo\;s interior: level of differential rotation\, the ex
 istence and extent of stable stratification\, and the size and nature of t
 he central core.
LOCATION:Seminar Room 1\, Newton Institute
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