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Solar Orbiter

Solar Orbiter. Contents. The mission The orbit The instruments VIM: Visible-light Imager and Magnetograph Helioseismology with VIM. Solar Orbiter: the mission. Mission: Assessment phase Instruments: Concept phase

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Solar Orbiter

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  1. Solar Orbiter

  2. Contents • The mission • The orbit • The instruments • VIM: Visible-light Imager and Magnetograph • Helioseismology with VIM

  3. Solar Orbiter: the mission • Mission: Assessment phase • Instruments: Concept phase • Objective: Produce images of the Sun at an unprecedented resolution and perform closest in-situ measurements • Launch: May 2015 • End: January 2024 • Cruise phase(3y), nominal phase(3y), extended phase(2y). • Solar Electric Propulsion  Chemical Propulsion

  4. Solar Orbiter http://www.esa.int/esaSC/120384_index_0_m.html

  5. Solar Orbiter: the orbit • Elliptical orbit around the Sun • Proximity to the Sun  up to 0.27 A.U • Inclination of up to 35º • Cruise phase of approx. 3.4 year using gravity assists from Venus and Earth.  150-day-long science orbit. • Close encounters with the Sun. • Venus gravity assist maneuvers to increase inclination.

  6. Solar Orbiter: the orbit Assisted by a series of Venus swing-bys, the spacecraft’s 150-day orbit will evolve gradually over the mission lifetime from an inclination of about 12 to 35 degrees to the solar equator. http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=33489

  7. Solar Orbiter: the orbit

  8. Solar Orbiter: the instruments • Field Package: • Radio and Plasma Wave Analyzer • Coronal Radio Sounding and Magnetometer • Particle Package: • Energetic Particle detector • Dust detector • Neutron and Gamma-Ray Detector • Solar Wind Plasma Analyzer • Solar remote sensing instrumentation: • Visible-light Imager and Magnetograph (VIM) • EUV Imager and Spectrometer • Coronagraph • Spectometer/Telescope for Imaging X-rays • Radiometer ???

  9. Visible-Light Imager and Magnetograph (VIM) • Vector magnetic field capabilities (priority). • Line-of-sight velocity maps by observing 4-5 points on either side of a spectral line. Mention the possible lines HMI, IMaX, GONG. • Two functions: • High resolution Telescope (HRT) • Full Disc Telescope (FDT) Using two telescopes that share filtergraph optics and detector. • Magnetic field and velocities calculated on board • Telemetry restricted and only approx. ¼ of total VIM telemetry will be assigned to velocity data.

  10. Local Helioseismology with VIM Advantages • Observation of high latitudes and the poles • Some very high resolution data • Proximity to the sun. Not really needed for helioseismology • Co-rotation (not clear what it means) • Maybe continuous 256x256 full disk data Disadvantages • Short series of data (~10 days every 50 days) • Variable resolution in a 512x512 grid (or less)

  11. Local Helioseismology with VIM • Dynamic/Magnetic description of the solar subsurface at high latitudes and the poles. • Rings: • Differential rotation close to the poles. • Meridional circulation: Solve the multi-cell circulation mystery… • Time Distance: • Dynamics down to the tacholine at the poles. • Combined VIM-HMI/GONG for deep interior research. • Holography • Farside calibration/mapping the near side • Mapping the poles.

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