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Related Concept Videos

The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
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Dynamics of Circular Motion01:30

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Preparation and 3D Tracking of Catalytic Swimming Devices
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A dynamic, rotating ring current around Saturn.

S M Krimigis1, N Sergis, D G Mitchell

  • 1The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland 20723, USA. tom.krimigis@jhuapl.edu

Nature
|December 14, 2007
PubMed
Summary
This summary is machine-generated.

Scientists imaged Saturn's ring current, revealing its variability and asymmetries. This differs from Earth's ring current, showing unique planetary space weather dynamics.

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Area of Science:

  • Planetary Science
  • Space Physics
  • Magnetospheric Physics

Background:

  • Earth's ring current, a high-altitude electrical current, was proposed in 1917 to explain magnetic field depressions during geomagnetic storms.
  • Previous studies confirmed Earth's ring current and observed/inferred similar currents at Jupiter and Saturn.

Purpose of the Study:

  • To image and characterize the ring current at Saturn.
  • To investigate the day-night pressure asymmetry and plasma sheet tilt of Saturn's magnetosphere.

Main Methods:

  • Utilized the magnetospheric imaging instrument (MIMI) aboard the Cassini spacecraft.
  • Analyzed in situ measurements and obtained images of Saturn's ring current.

Main Results:

  • Successfully imaged Saturn's ring current, revealing significant variability.
  • Observed strong longitudinal asymmetries in the ring current that corotate with Saturn.
  • Detected a day-night pressure asymmetry and a tilt in Saturn's plasma sheet.

Conclusions:

  • Saturn's ring current exhibits distinct characteristics, including rigid corotation and strong asymmetries, differing from Earth's.
  • These findings provide new insights into the dynamics of planetary magnetospheres and space weather.