http://sidc.be/nemo

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

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Solar Eruptions in Real time

• Flares
• CMEs

• SEC events at NOAA, SXI
• SolarSoft events
• B2Xflare

• Gopalswamy list
• http/sidc.be/cactus

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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.
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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
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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
  -gt to develop specifically tailored method.

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A. Detection
1.
2.
3.
4.
ERUPTION MEASURE
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DETECTION method
Higher-order Moments

• Centered moment of order k

• experimental

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2. Geometrical Extraction (1/3)

• Solar demisphere projected on the plane
• during an EIT wave event

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Geometrical Extraction (2/3)

• From Podladchikova Berghmans, 2005

The integrated positive intensity of the front
balances the integrated negative intensity of the
dimmings.
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Geometrical Extraction (3/3)

• Dimmings evolution and ICME

• Dimming is the coronal Magnetic filed probe
• Webb Hudson, 2000
• Atrill et al, 2006

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3. Validation (1/2)

• Density profile after cylindrical source
  explosion (Sedov)

Spatial coordinate
time
Fast mode moving upwards and slow downwards
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3. Validation (2/2)
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Example of Daily List
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Architecture
NEMO 5.0 Matlab 7.0
Detection
Real Time Catalog
Geometrical Extraction
SOHO scan catalog
Validation
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Conclusion (1/2)

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

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STEREO Waves
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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.

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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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