1 / 20

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

joella
Download Presentation

http://sidc.be/nemo

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related