The Post-Cassini View of the Io Plasma Torus Andrew Steffl, Adam Shinn (Southwest Research Institute – Boulder) With thanks to Fran Bagenal, Peter Delamere,

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Presentation transcript:

The Post-Cassini View of the Io Plasma Torus Andrew Steffl, Adam Shinn (Southwest Research Institute – Boulder) With thanks to Fran Bagenal, Peter Delamere, Nick Schneider and the UVIS team MOP 2011, Boston

Introduction The Io Plasma Torus in 2 Minutes The Role of Hot electrons Longitudinal Variations IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations 1. Io’s Volcanoes

IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations 2. Atmospheric Losses

IPT in 2 minutesIntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations 3. Torus emitting in the FUV

Bagenal & Delamere (2010) Mass & Energy Flow Through the Torus IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

UVIS EUV Spectrum of the Dusk Ansa IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

Sinusoidal Variations of the Torus Dusk Ansa IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

Phase of Azimuthal Variations with Time Slope yields a hour period; System III period is hours IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

Lomb-Scargle Periodogram Periodogram peak at hours IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

Note about System IV Brown (1995)Thomas et al. (2001) System IV is not caused by the local plasma rotation speed IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

Sinusoidal Variations of the Torus Dusk Ansa IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

29 Days = 1/f System III - 1/f “System IV” IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

Dual Hot Electron Model Two variations of hot electrons –One drifting relative to System III –One fixed in System III  IV = 50%  III = 40%  III = 290º  IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

Conclusions Frank & Patterson 2000 IPT in 2 minutesHot ElectronsLongitudinal VariationsIntroduction Hess et al., 2011 (submitted) Mechanism for producing a System III-fixed variation in hot electrons

Conclusions Most of the neutral material picked up into the Io plasma torus comes from the extended neutral clouds Hot electrons are required to supply the Io plasma torus with energy Cassini UVIS observed significant longitudinal variations in the Io torus composition –The variations drift at the System IV period –The amplitude varies on the beat period of System IV and System III Models with 2 longitudinal variations of hot electrons can qualitatively match the torus behavior –Hess et al propose a mechanism for producing hot electrons with a peak at 290º System III –What produces the System IV component? IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations

IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations System III System IV – System III System IV System III System IV – System III System IV + System III

IntroductionIPT in 2 minutesHot ElectronsLongitudinal Variations