V isible light I mager and M agnetograph T.Appourchaux on behalf of the VIM team IAS
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Transcript of V isible light I mager and M agnetograph T.Appourchaux on behalf of the VIM team IAS
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HELAS, Nice 27 September 2006
Visible light Imager and Magnetograph
T.Appourchaux on behalf of the VIM teamIAS
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Contents
• Scientific objectives• Instrument design• Instrument challenges• What now ?
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Scientific objectives
• Probe the Solar Dynamo:– High-latitude fields, flows and seismic waves
• Explore at all latitudes:– Energetics, dynamics and fine-scale structure of the
Sun’s magnetized atmosphere
• Investigate links:– Between the solar surface, corona and inner heliosphere
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Stereoscopic helioseismology
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What are the observables?
• High and low resolution imaging• Vector magnetic field• Solar radial velocities
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How can we do that?
• High and low resolution imaging– Full Disk Telescope (FDT), Field of view >2.5 deg, 2.5 cm dia.– High Resolution Telescope (HRT), 150 km resolution at 0.22 AU (1”), Field of view >15, 16 cm dia;
• Vector magnetic field– Stokes polarimetry in FeI 6173 Angström
• Solar radial velocities– 5 to 6 positions on the line profile
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VIM: Subsystems• FDT:
– Off-pointing mechanism: wedge prism (2.5 deg)
• HRT:– Image Stabilization System (0.02” overs 10 s)– Filtergraph (passband of 75 mAngström)– Polarization modulation package (PMP based on Liquid
Crystal Variable Retarder)
• Camera: 2k x 2k Active Pixel Sensor• Electronic box
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The VIM team• Germany:
– PI ship, management, HRT, Structure:MPS– Pointing: KIS
• Spain:– FDT, PMP: INTA– E-box: IAA– Structural and thermal analysis: IDR
• France:– Filtergraph: IAS
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Filtergraph concept• Telecentric
– No velocity change– Passband shifted and widened– All defects imaged on the solar image– Aperture apodization
• Baseline solution: Lithium Niobate Fabry-Pérot, 6 cm dia.
• Back-up: Fabry-Pérot with piezoelectric spacers
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Tunability requirement(TN-VIM-2005-02 and 03)
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Response (TN-VIM-2005-01)
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Challenges
• Space qual. of LCVR
• Space qual. Of LiNb03 etalons
• High solar flux 25 solar constant…
• Reduced telemetry: 20 kbits/s
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What now ?
• Call for Letter of Intent (ESA, 11 July 06)
• MPS response as of 15 September 06
• Heat Shield study till end 2007
• AO hopefully in 2008
• Launch in 2017
• Observation till 2023-2028…