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METIS.Coronal.Imaging.and.Polarimetry.for.Solar.Wind.and.Coronal.Mass.Ejections

METIS is a coronal imaging and polarimetry instrument that provides unique observations for studying the solar wind and coronal mass ejections. It addresses the four fundamental science objectives of Solar Orbiter in an irreplaceable way.

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METIS.Coronal.Imaging.and.Polarimetry.for.Solar.Wind.and.Coronal.Mass.Ejections

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  1. METIS Science Performance OATs OAC OACt Daniele Spadaro INAF-Osservatorio Astrofisico di Catania Italy METIS Calibration Workshop Florence, September 28th-29th, 2017

  2. Metis coronal imaging Polarized VL 580 - 640 nm UV HI Ly α imaging @ 121.6 ± 10 nm FoV (1.5° - 2.9° annular, 1.6 – 3.0 R◉ @ 0.28 AU) Spatial sampling element ≤ 4000 km (20”) @ 0.28 AU Time resolution ≥ 1 sec

  3. OAC OACt OATs UV and VL coronal images UVCS/SOHO Supersynoptic during Whole Sun Month 1996, 19th August – 1st September LASCO-C2/SOHO pB image on 1996, 20th August at 20:05 UT

  4. - METIS - • Off-limb and near-Sun coronagraphy • For the first time: • simultaneous imaging of the full corona in polarized visible • light (580-640 nm) and narrow-band ultraviolet • H I Ly α (121.6 nm) - Global maps of coronal emission - • Complete characterization of the most important plasma • components of the corona and the solar wind, i.e., • electrons and protons: ==> density (polarized VL), • outflow velocity (Doppler dimming of Ly α), … OATs OAC OACt

  5. OAC OACt OATs Full inversion output Source surface radius

  6. METIS Science Unique new observations for the investigation of the solar wind and the solar corona: OATs OAC OACt METIS indeed addresses the four fundamental science objectives of Solar Orbiter in a unique, irreplaceable way.

  7. METIS • Scientific Objectives – • (see the doc METIS-OACT-RPT-001 – METIS Scientific Performances Report) • - Origins and acceleration of the solar windstreams • 2. - Sources of the solar energeticparticles (SEP) • 3. - Origin and earlypropagation of coronal mass ejections • (CME) • 4. - Study of Sun-grazing comets (in addition) OATs OAC OACt * Crucialquestions in the field of coronal and solar windphysics *

  8. METIS • The scientificobjectivesdefine the observationalrequirementsthatwill be satisfied by the performances of the instrument OATs OAC OACt

  9. METIS VL Imaging Performances vs Field-of-View VL Imaging Performances  well within requirements OATs OAC OACt

  10. METIS UV-analog Imaging Performances vs Field-of-View • UV angular resolution • is worse: • FWHMX ≤: 90 [arcsec] • (≅60) • FWHMY ≤: 180 [arcsec] • (≅150) OATs OAC OACt

  11. METIS Instrument response OATs OAC OACt The effective areas are obtained from the overall instrument throughput, inclusive of the vignetting, times the geometrical area of the entrance aperture (∅ 40 mm).

  12. Expected countrates (i.e., CR, counts-of-detected photons/s/pixel) in the two wavelength bands of Metis from typical coronal radiances at minimum solar activity(IC, photons/s/cm2/sr) – see METIS-OACT-TNO-004 S/C @ 0.28 AU perihelion S/C @ 0.5 AU S/C @ 0.65 AU

  13. METIS Signal-to-noise (S/N) ratio and required exposure times OATs OAC OACt Note: In the case of maximum activity, the expected countrates are higher by a factor ranging from 3 to 6, depending on the height. In the case of CMEs, the expected countrates are about 20%-30% higher than those corresponding to the streamer belt.

  14. METIS Polarimetric Calibration Current voltage-quadruplet: Optimized voltage-quadruplet (max polarimetric efficiency Retardance= 90):

  15. METIS • Flow-down from mission-levelkey science questions to METIS scientificobjectives, and to measurementrequirements, whichcorrespond to specificobservingmodes of METIS • Traceabilitymatrix (see METIS-OACT-RPT-001) OATs OAC OACt

  16. METIS OATs OAC OACt

  17. METIS OATs OAC OACt

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