Coordinated Investigation Program Reference Heliosphere IBEX Joins at the Right Time

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Coordinated Investigation ProgramReference
HeliosphereIBEX Joins at the Right Time!

• Eberhard MöbiusJoe Davila, Giannina Poletto,
  Steve Suess

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A Great and Timely Opportunity!

• Voyager 1 Crossed the Termination Shock Now
  Roams the Heliosheath!Voyager 2 Will Follow at
  a Different Location
• IBEX Launch is Planned June 2008

Remember 1957/58!The International Geophysical
Year (IGY)
We Stuck Our Head Above the Atmosphere
Look Forward to 2007/08! The International
Heliophysical Year (IHY)
NASA Keep Voyager, Ulysses, ACE, SOHO,.. Our
S3C Great Observatory Alive!!!
We are About to Stick Our Head Out of the
Heliosphere
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What Is the Configuration of Our Fleet?

• Voyager 1 2 at Termination Shock and in
  Heliosheath
• Ulysses on its last Fast Latitude Scan During A-
  HeliosphereTwo Extended Quadratures with
  Earth-Sun Line 06-07 07-08
• ACE, SOHO, WIND provide Particle and Solar Image
  Observations from an Earth Vantage Point
• STEREO Joins Inner Heliosphere Fleet Summer/Fall
  2006Providing Stereoscopic Views of Solar
  Transients
• IBEX Joins Fleet June 2008Providing a Global
  View of the TS and LIC O Observations

• Solar Wind takes 1 Year from the Sun to the TS
  (90 AU)
• ENAs take 0.5 Years (4 keV/nuc) to 2 Years
  (0.25 keV/nuc) from the TS to IBEX IBEX
  Observes Response to 2006 - 08 Output During
  its Primary Mission Phase

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Voyagers at TS
TS Distance modeled by Wang Richardson
TSP at V2 observed at 77 AU If TSPs occur 7 AU
upstream TS at V2 is at 84 AUSept 2007 If
TSPs occur 4 AUTS at V2 is at 81 AUOct
2006(stationary shock)
Voyager 2
Voyager 1
Adapted fromRichardson, Stone
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Focus Areas of the CIP

• Benchmark Set of LIC Parameters Outer Boundary
  Condition for the HeliosphereIncludes He (LIC
  Proper) H, O (Interface H, O) Composition
  (Constraints for Ionization Radiation)
• Global Structure Size of the HeliosphereTopolog
  y, Structure Distance of Termination Shock and
  Heliopause LIC Magnetic FieldTransport of
  Cosmic Rays A- vs. A Heliosphere
• Evolution of CIRs Isolated CMEs Follow
  Structures from the Sun Throughout the Heliosphere

Observation Period 2006 - 2008 (-2010 for
IBEX)Constitutes Solar Minimum Well Organized
Heliosphere Isolated Transients
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Benchmark Set of LIC ParametersReference
Heliosphere

• LIC He Parameters (NHe, THe, vHe) at Solar
  Minimum Neutrals, UV, PU Ions (Ulysses, ACE,
  SOHO, Wind)Found that Ionization Plays Important
  Role
• NH at TS (Ulysses, Voyager, ACE, SOHO) Pickup
  Ions Solar Wind Slow Down
• NH in LIC Voyager at TSModeling of Filtering
  yields NH in LIC
• LIC O Parameters (TO, vO,NO at TS), Slowdown,
  Heating Deflection of Secondary O (IBEX,
  Ulysses)Modeling of Filtering yields NO in LIC
• Composition (Ulysses, ACE)Modeling yields
  Ionization Radiation Environment

Voyager at TS
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Global Structure Size of the Heliosphere

• During this Solar Minimum we are Lucky to Muster
  Simultaneously- Spacecraft from Inside 1 AU
  (Messenger) up to the Heliosheath (Voyagers)- 3D
  Capability in the Inner Heliosphere (Ulysses
  Coronagraphs)- Global Imaging of the
  Heliospheric Boundary (IBEX)- Comprehensive
  Particle, Fields Solar Observations from 1 AU
  (ACE, SOHO, WIND STEREO)

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• Ulysses Orbit in 2006-2008
• S. T. Suess1 and the Ulysses Project
• 1. National Space Science Technology Center,
  NASA Marshall Space Flight Center, MS XD12,
  Huntsville, AL 35801 USA

Quadratures, a unique Vantage Point of Ulysses
in 2006-2008 relative to the Earth, ACE, SOHO,
STEREO, Solar-B, etc. Voyager
Coronagraphs provide view of Coronain Plane of
Ulysses Orbit
S. T. Suess
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Ulysses-SWICS Overview

• Ulysses SWEPAM SWICS Provide Unambiguos
  Information about Fast and Slow Solar Wind

von Steiger Fröhlich, ISSI SR-3, 2005
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Earth-Sun Ulysses Quadratures 2001-2009

• Configuration in Fall 2001 was never quite a
  quadrature Ulysses at high heliographic latitude,
  but much less than 900 All periods were very
  short!
• Quadratures in winters 2007 2008 feature times
  when the SOHO-Sun-Ulysses angle remains near 900
  for 5 months. Ulysses is at heliographic latitude
  near 900 Allows Monitoring of 3D SW Output

S. T. Suess
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Ulysses Orbit and Solar Cycle
Launch Dates of New Missions
IBEX Launch
S. T. Suess
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Evolution of CIRs Isolated CMEs

• Solar Minimum is the Time of Isolated
  Transients- Co-Rotating Interaction Regions-
  Few Isolated CMEs
• Spacecraft Constellation Allows 3D Tracking
• Modeling of Transient Evolution - During Solar
  Minimum Allows a More Orderly Start- Spacecraft
  Constellation Allows Tracking Throughout the
  Heliosphere

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Ulysses in Fixed SOHO/Earth - Sun Coordinates

• Ulysses moves S - N (Dec 19, 2006, - May 28,
  2008)
• Fuchsia Portion Dec 19 2006 - May 28
  2007Ulysses within 5o of the Suns Limb
• Green Portion Dec 2 2007 - May 28 2008Ulysses
  within 10o of the Suns Limb

Long quadratures - Allow 3D accumulation over
Solar Rotation - Provide long time to
catch activity towards Ulysses
S. T. Suess
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STEREO to be Launched Summer 2006

• STEREO Positions During Ulysses Fast Latitude
  Scan
• Ulysses Passes behind Earth (ACE, SOHO, Cluster
  etc)
• Ulysses STEREO See 3D Evolution of Transients

S. T. Suess
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CIP Reference Heliosphere

• We have an almost ideal Once in a Lifetime
  Opportunity to unravel the Heliospheric
  Structure and Temporal Evolution
• Are there other Investigation Aspects that I
  missed?
• Which Detailed Observations should be Performed
  on these Spacecraft to Provide Maximum Synergy?
• Which Modeling Efforts should be Undertaken?
• Any Additional- Targeted Observations-
  Monitors- Modeling Efforts?

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Ulysses-SWICS Overview
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Ulysses-SWICS Overview