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http://sidc.be/nemo

"To understand is to perceive patterns". http://sidc.be/nemo. ROB. Outline. Introduction NEMO in the context of Space Weather Services Technological challenges Bare Bones of NEMO software Architecture Recognition & Diagnostic, Catalogue

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http://sidc.be/nemo

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  1. "To understand is to perceive patterns" http://sidc.be/nemo ROB

  2. Outline • Introduction • NEMO in the context of Space Weather Services • Technological challenges • Bare Bones of NEMO software • Architecture • Recognition & Diagnostic, • Catalogue in real time • Discussion • Event classification, • hidden properties. • Perspectives

  3. Solar Eruptions in Real time • Flares • CMEs • SEC events at NOAA, SXI • SolarSoft events • B2Xflare • “Gopalswamy” list • http:/sidc.be/cactus

  4. Importance of On-Disk Eruptions geoeffectivity SOHO profits continuous view of the Sun. SOHO is in the L1 Lagrange point in the Solar-Terrestrial System, and goes around the Sun simultaneously with the Earth.

  5. How does Eruption look like in EUV? precursor • “EIT wave” Original Image Image substructed from prevrious one Discovery: Thompson et al, 1998; On disk CME signatures: Biesecker & Thompson, 2002

  6. To extract such a signal from noise • Requires an advanced  technological approach                         • Huge phenomenological diversity of events • Signal weakness on top of dynamical backgrounds • Requires a new pattern recognition approach • methods for tracking solid objects do not apply, • regular properties of EIT waves classification -> to develop specifically tailored method.

  7. A. Detection LASCO CME 1. 1997/04/01 06:22:00 2. 1997/04/01 09:24:33 WHERE? 3. 1997/04/01 12:05:23 4. 1997/04/01 15:18:38 1. 2. 3. 4. ERUPTION MEASURE

  8. Higher-orderMoments DETECTION: method PDF(xi) • theoretical: • Measure of PDF • asymmetry: • flatness: • g1,g2>> 0computed for pixels distribution of EUV image could be indicators of large scale coherent structures: Gaussian: g1=g2=0 for a Gaussian distribution g1=g2= 0 g1=0, g2>0 - Skewness - Kurtosis g1>0, g2>0 • Centered moment of order k: • experimental:

  9. CROSS-SECTION • 8 vertical cross-section from EC, radially Eruption center EIT wave front dimmings 2. Geometrical Extraction (1/3) • Solar demisphere projected on the plane • during an EIT wave event

  10. Geometrical Extraction (2/3) • The integrated positive intensity of the front balances the integrated negative intensity • of the dimmings. • From Podladchikova & Berghmans, 2005

  11. Geometrical Extraction (3/3) • Dimmings evolution and ICME • Dimming is the coronal Magnetic filed probe • Webb & Hudson, 2000 • Atrill et al, 2006

  12. Density profile after cylindrical source explosion (Sedov) 3. Validation (1/2) Spatial coordinate time Fast mode moving upwards and slow downwards

  13. 3. Validation (2/2)

  14. Example of Daily List

  15. Architecture NEMO 5.0 Matlab 7.0 Detection Real Time Catalog Geometrical Extraction SOHO scan catalog Validation

  16. Conclusion (1/2) • SIDC new product (sidc.be/nemo) • Real-time catalog • Monthly scan • STEREO Waves

  17. Under condition of free propagation rotation of EIT wave fronts • observed regulary STEREO Waves

  18. Conclusion (2/2) • detects only eruptions, not flares. • can build on-disk SP.W. event catalog with SWAP and SECCHI. • extraction technique brings new insight on events. • is able to sort out the SOL.O. or SDO dataflow ~TB/day.

  19. Thanks • To Barbara Thompson for 1997-1998 EIT wave catalog • To SIDC preview web, Cactus, B2X team • To BELSPO, ESA, NASA, SECCHI/STEREO • Orleans, Meudon

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