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SOTERIA WP2 «  Photosphere » : ROB contribution

ROB Lead : Frédéric Clette. SOTERIA WP2 «  Photosphere » : ROB contribution. Identify spatio-temporal patterns in past sunspot record ( Durations = decades to centuries) : Constraints to physics - based solar cycle models : non- linear « dynamo waves  », flux emergence processes

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SOTERIA WP2 «  Photosphere » : ROB contribution

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  1. SOTERIA Kick-Off, ESWW, Brussels ROB Lead: Frédéric Clette SOTERIA WP2 « Photosphere» : ROB contribution

  2. Identifyspatio-temporal patterns in pastsunspot record (Durations=decades to centuries): • Constraints to physics-basedsolar cycle models: non-linear « dynamo waves », flux emergenceprocesses • Predictivecapability + enhancedpast record (> flare occurrence) • Establish long-term standard photospheric indices of solaractivity: • Pastreconstructedsunspot indices (unexploited information: hemispheric & cycle splitting, group class frequency, etc.) • Future extension based on new techniques (electronicimaging): matching the visual Ri index? • Multiple indices > optimizedproxies for solar, SW or climatologicalparameters(X-UV solar fluxes, TSI, flare index, closed/open solarmagneticfield, toroidal/poloidalmagneticfield, geomagnetic indices, NH temperatureanomaly) SOTERIA Kick-Off, ESWW, Brussels Science goals

  3. Reconstruction of pastvisual information (access to new data): • Digitisation + encoding of pastdrawing collections: • Primary objective : ROB drawingseries (1940 -2008) • Planned extensions: Zürich-Locarno (1850-2008), Konkoly Obs., Kanzelhöhe, Skalnate-Pleso • Sunspot group tracking: history of all individual groups (cycles 18-23 + extension before cycle 18) • Birth-to-deathchronology • Type (morphology: Zürich, Mc Intosh classification), sunspot count, size (E-W, N-S, area?), rotation rate, dipole tilt. • Initial selection of standard descriptive parameters (subset of KO descriptors?) > standard publication format of photospheric data • Base tool for detailedflareoriginstudies (precursor scenarios, active longitudes, … > prediction) SOTERIA Kick-Off, ESWW, Brussels ROB Work item 1

  4. Study and evaluation of an image-basedsunspotactivity index (standardization): • Step 1: Set of possible definitions(Joint WP2 input) • Step 2: Application of proposeddefinitions to availableseries(> 1 solar cycle): • Data sets: SOHO-MDI, Debrecen-RGO digitizedcollection, Kanzelhöhe WL CCD images, Uccle WL CCD images, …. • Step 3: comparative studies of generatedseries • Reference: SIDC relative sunspot index Ri • Statisticalcorrelativemeasures: indices vs Ri, inter-index • Relative meritassessment of differentdefinitions: • Correlationwith the Ri long-termreference • Sensitivity to seriesproperties (instrument resolution, seeing conditions) and to solar cycle phase. • Relation facular/sunspot indices SOTERIA Kick-Off, ESWW, Brussels ROB Work ITEM 2

  5. Manpower • SOTERIA: (32 ManxMonth, ~105k€) • 0.5 fte/3 years (0.5 fte) Operator (digitization, data acquisition/distribution) • 1 fte/6 months (0.15 fte) Post-doc (image-based index study) • 1 fte/1 month (0.03 fte) Senior scientist (image-based index study ) • 1 fte/6 months (0.15 fte) ICT (support to VO) • ROB (12 ManxMonth): 0.1 fte Senior scientist, 0.1 fte ICT, 2x0.25 fteoperator + 4 part-time observers (opticaltelescopes). • STCE (36 ManxMonth): 0.5 fteoperator, 0.5 ftescientist (graduate?). • Material ressources: • SOTERIA: 2.5 k€ (desktop PCs) • STCE: digitizing hardware (A3 scanners, 5k€) • LOTTO: new 2kx2k CCD camera + matchedoptics (60 k€) • ROB: • Infrastructure: USET Uccle solartelescopes, technical maintenance, ICT infrastructure (servers, storage) • Heritage: ROB solardrawing collection, RWC « Sunspot » extensive experience. SOTERIA Kick-Off, ESWW, Brussels Availablemeans

  6. Digitizeddrawing collections + database: ROB-Uccle (+ Zürich-Locarno) • Visual sunspot group catalog/database (1940-2008) (mergedwith SDD?) • Objective evaluation of proposed image-based photospheric activity indices (+ faculae?) >> Standard image-based global activity index/indices (Publication) • applicable to anypast and future image collection (photographic/CCD, ground/space-based) • White-light CCD images from the USET (Uccle station, ROB) • Opening of future prospects: • Networking and collaborations between SOTERIA-contributing GB observatories • Encoding of otherdrawing archives: extension of individual group tracking to past centuries. • Establishment of a new international referencesunspot index based on electronicimaging (« SOTERIA number »?). • Multi-secularirradiance proxy: Ri vs image index calibration (incl. facular proxy) SOTERIA Kick-Off, ESWW, Brussels Deliveredproducts

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