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Dawn-Dusk Oscillation of the Io Plasma Torus and the Vasyliunas E-V Theorem
A. J. DesslerDept. of Atmospheric Science
Texas A&M UniversityCollege Station, Texas
and
B. R. SandelLunar and Planetary Laboratory
University of ArizonaTucson, Arizona
Boston MOP Meeting 15 July 2011
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IO TORUS DAWN-DUSK OFFSET
Approaching Ansa
Dawn Ansa Dusk Ansa
Receding Ansa
Viewed from Voyager
Viewed from Earth
Torus w/ Ribbon on inner (i.e., Jupiter) side
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OSCILLATION OF IO TORUS
A
Voyager Earth
A is Magnetic Anomaly at λIII ~110°
Approaching
Dawn A
Approaching
Dawn
Dusk Ansa
Receding Ansa
Dusk Ansa
Receding Ansa
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Magnetic Anomaly – Announced (John Clarke et al. 2002 Birmingham DPS meeting).Quantitatively defined (Denis Grodent et al. 2008 JGR and Hess et al. 2011 JGR).
Weak B
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Dessler & Sandel, 1979 data from Voyager Schneider & Trauger, 1991 data from Earth 12 years apart
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Areas A and B are equalAnomaly magnetic field
maps to equator
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No Anomaly change in B-field at Equator
Flux tube Big-Foot resistant to interchange
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EFFECT OF MAGNETIC ANOMALY
A Dusk
Magnetic-Anomaly flux tubes map to equator to form impoundment region
LimitedOutflow
LimitedOutflowDawn A
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Central Meridian Longitude (System III)CML provides snapshots of Ribbon Distances
Dawn minus Dusk Distance
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Anomaly between Dawn and NoonMaximum outflow – Max Offset
Anomaly between Dusk and MidnightMinimum outflow – Minimum Offset
Dawn
min
us D
usk
Ribb
on D
istan
ce
Outflow from torus toward tail causes Torus Offset
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Maximum Outflowfrom torus toward Tail
Max Offset
Dawn Dusk
Noon
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Local-Time range of Anomalyat given CML viewed from Earth
Anomaly out of the way. Maximum
Outflow – Max Offset
Noon to Dawn
Anomaly ~110°
Dawn
min
us D
usk
Ribb
on D
istan
ce
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Minimum Outflowfrom torus toward Tail
Dawn Dusk
Noon
Midnight
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Midnight to Dusk
Local-Time positions of Anomalyat given CML viewed from Earth
Anomaly Impedes Outflow
Anomaly out of the way. Maximum
Outflow
Noon to Dawn
Dawn
min
us D
usk
Ribb
on D
istan
ce
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CONCLUDING THOUGHTS• The Improved Magnetic-Anomaly Model explains the torus
oscillation.• Other Jovian spin-periodic phenomena can be explained by
this Magnetic-Anomaly Model.
• The Vasyliunas E-V Theorem is important. E is a result of V, E cannot cause V.
Please contact me for more information, wild ideas, or discussion.
e-mail: [email protected]
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• Extra slides follow
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TIME-VARYING ELECTRIC-FIELD HYPOTHESISThis idea suffers two flaws:
(a) Where is the E-field created so it knows Jupiter’s rotational phase?
Problem: As plasma flows down tail, a varyingV X B field is created at different distances — all longitude phases are mapped back to torus. Therefore, E-field will not work.
(b) Inconsistent with the Vasyliunas E-V Theorem. GRL 2001.
Problem: V X B can create E, but E cannot cause magnetospheric plasma to move. No E-fieldwill work.
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CONCLUSIONS1. The Magnetic Anomaly vital to the Magnetic-Anomaly Model
has been discovered, and the Vasyliunas E-V Theorem provided needed guidance.
2. The torus oscillation is explained by an improved Magnetic-Anomaly Model.
The Magnetic-Anomaly Model is open for exploitation. Examples of Jovian spin-periodic phenomena that could be
explained by the Magnetic-Anomaly Model: a. How Active Sector works. It contains many Jovian spin-
periodic phenomena. See Sect. 10.7 in "PJM". b. The 10-hour Plasmoid "bubbles" travelling down the Jovian tail reported by McComas et al. Science 2007. c. The Simpson Clock – highest energy and flux of relativistic
electrons released from Jupiter when Magnetic Anomaly faces sunward.
d. The Lyman-alpha bulge. e. Extension to Saturn spin-periodic phenomena?
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Longitudinal Extent of AnomalyA A
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A No
on
A Da
wn
A M
idni
te
A Du
sk
A Mid
nite
A Du
sk
A No
on
A Dawn
Position of Anomaly for given CML Observed from Earth
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