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"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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Presentation Transcript
outline
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
solar eruptions in real time
Solar Eruptions in Real time
  • Flares
  • CMEs
  • SEC events at NOAA, SXI
  • SolarSoft events
  • B2Xflare
  • “Gopalswamy” list
  • http:/sidc.be/cactus
importance of on disk eruptions
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.

how does eruption look like in euv
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

to extract such a signal from noise
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.
slide7

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

slide8

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:
2 geometrical extraction 1 3

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
geometrical extraction 2 3
Geometrical Extraction (2/3)
  • The integrated positive intensity of the front balances the integrated negative intensity
  • of the dimmings.
  • From Podladchikova & Berghmans, 2005
geometrical extraction 3 3
Geometrical Extraction (3/3)
  • Dimmings evolution and ICME
  • Dimming is the coronal Magnetic filed probe
  • Webb & Hudson, 2000
  • Atrill et al, 2006
3 validation 1 2
Density profile after cylindrical source explosion (Sedov)3. Validation (1/2)

Spatial coordinate

time

Fast mode moving upwards and slow downwards

architecture
Architecture

NEMO 5.0

Matlab 7.0

Detection

Real Time Catalog

Geometrical Extraction

SOHO scan catalog

Validation

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