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The haecceity of EIT Jean-François Hochedez SIDC - Royal Observatory of Belgium

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Page 1: The haecceity of EIThomepage.oma.be/hochedez/Public/BoudinesDays_JFH... · 2005. 10. 25. · Results 1. Anisotropy of wavefront observed even without obstacles. Correlation with the

The haecceity of EIT

Jean-François HochedezSIDC - Royal Observatory of Belgium

Page 2: The haecceity of EIThomepage.oma.be/hochedez/Public/BoudinesDays_JFH... · 2005. 10. 25. · Results 1. Anisotropy of wavefront observed even without obstacles. Correlation with the

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&Fast magnetoacoustic linear wave/shock’

‘piston driven shock’, ’blast wave’

‘quasicircular expanding structure’

‘plasma compression on separatrix’

‘snow-plow effect’

’nonlinear fast’

’ why too slow?’

‘loop opening’

’expanding footpoints’

‘separatrix emits waves’

‘stationary fronts’

‘TCH’

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( �� �� ����������������������

&��� ��������)�

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‘dimming stops, but EIT wave

propagates (yes/no)’.

‘canalized dimmings’.

EIT waves without dimmings

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Page 6: The haecceity of EIThomepage.oma.be/hochedez/Public/BoudinesDays_JFH... · 2005. 10. 25. · Results 1. Anisotropy of wavefront observed even without obstacles. Correlation with the

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*+�������,�-�����������%�(����������������� ���������������

Simultaneous peaks+ dimming area criteria

� EIT Waves!

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• 50 events analyzed automatically.• 35 of them analyzed visually

Depending on thresholds :

o 5 events not detected but no false alerts (wrong negatives)

o All events detected, 4 false alerts (wrong positives)

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April-June 1997 and May 2005 analyzed

Thresholds to be optimised to minimize false alerts and missed events.

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Results

1. Anisotropy of wavefront observed even without obstacles. Correlation with the associated dimming;

2. Outer border of the dimming coincides with inner border of the EIT wave front for homogeneous and anisotropic propagations and in all radial directions;

3. Width of the front grows ~quadratically in time; 4. The integrated intensity of wave front grows during > 1/2 hr after the eruption.

If EIT waves were linear magnetoacoustic waves propagating from the flare source, one would expect the front intensity to decrease with time;

5. The integrated positive intensity of the front balances the integrated negative intensity of the dimmings in the early life of EIT waves.

Conclusions This suggests that the energy supply to the EIT wave fronts possibly originates directly from the dimmings.

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Read more on this study

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VELOCIRAPTORVELOCIty & bRightness vAriations maPs construcTOR

Quantify motion together withintrinsic brightness variation

in EIT image sequences

Hochedez & Gissot, 2005

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Inputs & outputsVelocity

field

Image In(x,y)

Image In+1(x,y)

BrightnessVariation

field

1. Similarity fieldbetweenIn(x,y) (warped)and In+1(x,y)

2. Local “texture”3. Residuals

e.g. EIT “CME Watch”

Hochedez & Gissot

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Brightness Constancy Assumption

0))(),((dtd =tytxI

0... =++=∂∂+∇ tyyxx IvIvI

tI

vI��

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� ������ ���� ��� � �

�������� ��������� ��

Ik

Ik ∂∂= ��� ������

Hochedez & Gissot

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2nd equation: the LUCAS-KANADE algorithm

Possible to add unknown(s) �

such as:

• Brightness Variation (this study!)

• Contrast variation, shear, etc.

The Lucas-Kanade assumption (locally uniform motion)

provides extra-equations

8 new equations for a 3x3 neighborhood

Hochedez & Gissot

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19

Is the common estimation of BV and v possible ?If yes, where?

Neighborhood of least-squares estimation

11

)x(I)x(I)x(I)x(I

A 1Ny0y

1Nx0xT

���

���

= −

��

��

))x(I)x((Ib 1Nt0tT

−= ��

��

E MEAA TT =���

���

=�3

�2�1

M

�∈

∧+++=

Ryx,

2tyyxx

�I,v,vLSyx �I)I.vI.v(Iminarg)�I,v̂,v̂(

yx

bAM)�I,v̂,v̂( T1TLSyx

−∧

−=

OF ReformulationA . (vx,vy,BV) = b, with:

E is the orthonormal eigenvector matrix

Least square formulation

Hochedez & Gissot

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Wow..

Have mercy!No equation,

please JF!

Is this going to be useful to Solar Physics

one day?

Rrrr..

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2

Image 13 May 98

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Image 23 May 98

1998-05-03 21:22:37 (512x512 rebinned) 3

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3-20.5Difference image

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3-20.5Diff rot cor

Difference image corrected for differential rotation

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3-20.5bv Brightness variation map

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3-20.5Diff rot cor convolDiff. image cor. for dif. Rot. & gaussian filtered

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PDF of BV versus [dif.rot corrected + gauss.fltrd]

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Velocity Map

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Differential rotation recovered from a couple of EIT images

No intensity variation estimation

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Yes

I was expecting to hear more about Boudine and haecceity

…the latter only if really needed.

IndeedEh oui

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Spatial resolutionField of View

Unexplored region of interest

High Cadence

(Long-term)temporalcoverage

Temperature range/coverage(spectral resolution)

Where to go to continue solar research after SoHO-EIT?

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Physics of the Sun Atmosphere todayresearch fields & keywords

1. Coronal heating :– Energy transport from convection zone to upper atmosphere, loop models, MHD & kinetic modeling, physics of

the TR, moss, variability… Nanoflare / DC –based heating, MHD wave / AC –based heating, AR vs QS heating

2. Magnetic field, structure(s), activity :– Topology, handling complexity (eg. SOC), coupling of scales, modelling, MHD extrapolations,

physics of the reconnection, of MHD waves, coronal seismology, variability (why), helicity…– Phenomenology, all atmospheric structures: CH, prominences, plumes, BP, blinkers, explosive events, and all small-scale

transients, (macro-) spicules, chromospheric network, mag. carpet, interconnecting and transequatorial loops, canopy, AR�CH …

3. Large transients :– CMEs, Flares, Eruptive prominences, Moreton & EIT waves - Their formation, trigger(s), timing, precursors,

numerous scenarii, non-equilibria, helicity…– Validity of operational SpW nowcasting and forecasting

4. Emission mechanisms, irradiance, and abundances :– Ly-alpha (H&He), FIP effect, atomic processes, ionization balance, DEM analysis, radiative transfer/loss,

plasma properties, diagnostics, irradiance budgets, impact on Earth thermosphere and ionosphere, variability (how)…

5. Solar cycle studies, atmospheric signatures of the dynamo :– SOHO follow-up in cycle 24, All long-term studies, differential rotation of tracers, 1.3-year periodicity in the

Corona, new proxies, helicity (shedding), active longitudes…

6. Heliospheric studies, solar wind, Space Weather :– Fast & slow wind acceleration, large-scale transients, AR expansion, CH, streamers, H & He distribution,

Doppler dimming, inflows, blobs, plasmoids, geoeffectiveness, SpW Forecast, Climate Global Change…

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Large cross-talk between goals and techniquesillustrative examples

Compensation of DEM limits

Scaling laws (eg. Loops)

flat-fielding

HMI

MHD Waves

Prominences

All!

Atmospheric structures

Forecast validation

YesYesYesYesStatistics

NowcastHuge archiveIrradiance budget

NowcastBrightenings extraction

Image processing

Ly-aLong-termIn-flight

RadiometryenergeticsDEMCalibrations

All in-situSOHOEVESTEREO XRT

EIS - S.O.Joint studies

?PerhapsEIT wavesEstimate viscosity

Coronalseismology

YesHelicity removal

PrecursorsCurrent sheet sites

MHDextrapolation

YesYesPrerequisite?PerhapsLoop modelling

DEM

HeliosphereWind & SpW

Cycle & dynamo

Irradiance +Basic processes

Large-scale Transients

Heating

Several techniques often combined to reach a result

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Sun side view

Solar Panel Concentrator

Thermal PlasmaMeasurement Unit

SWAP

LYRA

Digital Sun Sensor

Bepi Colombo Star Tracker

DTU Star TrackerDSLP

DSLP

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Inside LYRA

3 units12 detectors

24 LEDs…

315.0 x 92.5 x 222.0 mm~A4 size

5.0 kg

View-limiting aperture (8mm)

Calibration LEDs

Filters

Detector headCollimatorAssembly

PrecisionApertures(3mm)

Heater

Heatsink

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1 10 100 100010-9

10-8

10-7

10-6

1x10-5

1x10-4

10-3

10-2

10-1

100

5V

MSM 8 MSM 11 MSM 15

Abs

. Res

pons

ivity

(A/W

)

Wavelength (nm)

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Solar blind diamond detectors

Ti/Pt/Au contacts – diamond MSM structures

Ø 5mm Ceramics (TO-8)

IMOMEC, Belgium with the collaboration of the National Institute for Materials Science (NIMS), Japan.

MSM structures and PiN junctions, depending on the LYRA channel.

The collaboration between ROB and IMOMEC originates with the BOLD program (http://bold.oma.be) submitted to ESA.

LYRA contributes to demonstrating the feasibility of a technology that will be highly beneficial in the context of the Solar Orbiter ESA mission.

diamond PiN sensor

Images: courtesy IMOMEC

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SWAP, off-axis EUV imager

Primarymirror

baffleDoor(closed)

Secondarymirror

Focal plainassembly radiator

Image courtesy AMOS S.A.

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Scintillator-coated APS detectorsDetection at 17.5 nm is criticalSWAP orbit is submitted to radiations (4 krad EOL)

APS CMOS from FillFactory (B)with scintillator coating (EUV sensitivity)and passive cooling (< -10°C)

• 12-bit readout• 1 Mpixels 15 µm• tolerant to > 230 krad• QE x FF ~20 % (VIS)

Tests are conducted at PTB, BESSY with MPS to assess the performance at 17.5 nm of different scintillator coatings

Image at 19.5 nmin the collimated beamat the PTB synchrotron(Berlin)

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2001 May 10., 19:20:52

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Lifetime distribution

Duration (Hours)

# of occurences Some PLS (< 4 Mm)live up to 12 hours

20010515

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Movie

• One day (15 May 2001)• 19,5 nm

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Haecceity

|haks��t�|– ORIGIN mid 17th cent.: from medieval Latin

haecceitas, from Latin haec, feminine of hic ‘this.’• that property or quality of a thing by virtue of

which it is unique or describable as “this (one).”• the property of being a unique and individual

thing.• Idiosyncrasy, nitty-gritty• Quiddity

– which also means hair-splitting…

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Deleuze and Guattari's positive ontologyA Thousand Plateaus

• It is the entire assemblage in its individuated aggregate that is a haecceity; it is this assemblage that is defined by a longitude and a latitude, by speeds and affects, independently of forms and subjects, which belong to another plane. It is the wolf, itself, and the horse, and the child, that cease to be subjects to become events.

• You will yield nothing to haecceities unless you realize that that is what you are, and nothing else. ... You are longitude and latitude, a set of speeds and slownesses between unformed particles, a set of non-subjectified affects.

• A haecceity has neither beginning nor end, origin nor destination; it is always in the middle. It is not made of points, only of lines. It is a rhizome…

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Haecceity of EIT

• EIT is a TIE in the Solar community– And Boudine is a bedoin

• EIT is a highly cited instrument

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Boudine’s idiosyncrasy

Serendipitous

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Boudine’s idiosyncrasy

Bravery & tenacity

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Thank you Jean-Pierre

Gesundh.eit & tak.eit. Easy !

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Difference image

3 May 1998

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EIT image #3

1998-05-03 21:22:37 (512x512 rebinned)

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EIT image #2

14 minutes later

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