Meudon April 22, 2008

Measurements of Measurements of the altitudes of solar the altitudes of solar

filamentsfilaments

Guy ArtznerGuy ArtznerInstitut d’Astrophysique SpatialeInstitut d’Astrophysique Spatiale

OrsayOrsay

[email protected]@m4x.orgftp://ftp.ias.u-psud.fr/gartzner/ftp_projet/Secchi/ftp://ftp.ias.u-psud.fr/gartzner/ftp_projet/Secchi/

Meudon April 22, 2008Meudon April 22, 2008

mailto:[email protected]

STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small basisSmall basis Large basisLarge basis

may 1st ,2007 03h 51m may 1st ,2007 03h 51m

no adjustments: no adjustments: strenuous crossed viewingstrenuous crossed viewing

Altitude of solar filaments Guy Artzner Altitude of solar filaments Guy Artzner MeudonMeudon April 22, 2008April 22, 2008

STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small basisSmall basis Wide basisWide basis

may 1st ,2007 03h 51m may 1st ,2007 03h 51m

crossed views: crossed views: Visually correct adjustment with StereoPhotoMaker Visually correct adjustment with StereoPhotoMaker procedureprocedure


STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small basisSmall basis wide basiswide basis

may 1st ,2007 03h 51m may 1st ,2007 03h 51m

Visually correct adjustment with FITS parametersVisually correct adjustment with FITS parameters


STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small basisSmall basis Large basisLarge basismay 1st ,2007 03h 51m may 1st ,2007 03h 51m

Stereo PhotoMakerStereo PhotoMaker


STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small or wide basisSmall or wide basis

Numerical projection methodNumerical projection methodEvery point Pa of a (right) view from STEREO-A has two integer coordinates ia and ja . This point is colored in blue, according to the corresponding intensity. We firstly compute the cartesian coordinates (x,y,z) of the physical point M at the intersection of the line of sight with the sphere of radius R centered on the Sun’s center.We then compute the image coordinates ib and jb of the image point Pb corresponding to the physical point M in the (left) STEREO-B image. The point Pa is colored in red, according to the intensity actually measured at the location Pb in the STEREO-B image.


LUNIK IIILUNIK IIIHistoire de deux Histoire de deux planètesplanètesGérard P. KuiperGérard P. KuiperL’AstronomieL’Astronomie , pp. 322-328, nov. 1962 , pp. 322-328, nov. 1962


STEREO-B view STEREO-B view projected on theprojected on the STEREO-A view STEREO-A view

according to the according to the FITS headersFITS headers



STEREO-B view STEREO-B view projected on theprojected on the STEREO-A view STEREO-A view

after an automaticafter an automaticadjustment ofadjustment ofONE angularONE angularparameterparameter


700 Mm 700 Mm 710Mm710Mm

720Mm 720Mm 730Mm730Mm

STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small basisSmall basis Large basisLarge basis

may 1st ,2007 03h 51m may 1st ,2007 03h 51m

Medicis correlatorMedicis correlator


STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small basisSmall basis 45.2° large 45.2° large basisbasis

february 2 ,2008 00h06m 2008 february 2 ,2008 00h06m 2008 600 seconds cadence600 seconds cadence 500 pixels 500 pixels parallaxparallax


STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small basisSmall basis 45.2° large 45.2° large basisbasisfebruary 2 , 19h56m - february 3, 05h06m 2008 february 2 , 19h56m - february 3, 05h06m 2008 600 pixels parallax 600 pixels parallax

Medicis correlator Medicis correlator Reference ZoneReference Zone


STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small basisSmall basis Large basisLarge basis Medicis Medicis correlatorcorrelator

X: time X: time february 1 , 19h56m - february 3, 05h06m 2008 february 1 , 19h56m - february 3, 05h06m 2008 Reference Reference ZoneZoneY: Y: amount of the east-west component of the average vector between homologous amount of the east-west component of the average vector between homologous

pointspoints -2 to +6 pixels: 7 000 km solar asphericity OR residual defects of relative adjustments -2 to +6 pixels: 7 000 km solar asphericity OR residual defects of relative adjustments between A and B?between A and B?



Medicis correlator Medicis correlator Zone#1Zone#1



X: time X: time february 1 , 19h56m - february 3, 05h06m 2008 february 1 , 19h56m - february 3, 05h06m 2008 Zone#1Zone#1Y: Y: east-west location of the barycenter of the largest connex region where east-west location of the barycenter of the largest connex region where the east-west component of the correlation vector is larger than 10 pixelsthe east-west component of the correlation vector is larger than 10 pixelsa) effect of the solar rotationa) effect of the solar rotationb) the «horizontal» size of the frame is too small b) the «horizontal» size of the frame is too small



Medicis correlator Medicis correlator Zone#2Zone#2



X: time X: time february 1 , 19h56m - february 3, 05h06m 2008 february 1 , 19h56m - february 3, 05h06m 2008 Zone#2Zone#2Y: Y: east-west location of the barycenter of the largest connex region where east-west location of the barycenter of the largest connex region where the east-west component of the correlation vector is larger than 10 pixelsthe east-west component of the correlation vector is larger than 10 pixelsa) effect of the solar rotationa) effect of the solar rotationb) the «horizontal» size of the frame is large enough in order to follow a b) the «horizontal» size of the frame is large enough in order to follow a solar structure solar structure


STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small basisSmall basis Large basisLarge basis Medicis correlatorMedicis correlator

X: time X: time february 1 , 19h56m - february 3, 05h06m 2008 february 1 , 19h56m - february 3, 05h06m 2008 Zone Zone #2#2Y: Y: amount of the east-west component of the average vector between amount of the east-west component of the average vector between

homologous pointshomologous points over the largest connex region where this quantity is larger over the largest connex region where this quantity is larger than than 1010 pixels pixels










STEREO Secchi EUVI 304ASTEREO Secchi EUVI 304A Small basisSmall basis Large basis CONCLUSIONSLarge basis CONCLUSIONS

For STEREO Secchi EUVI 304A images with a For STEREO Secchi EUVI 304A images with a separation angle as high as 45° we produced:separation angle as high as 45° we produced:_ anaglyphic views for the visual detection of high _ anaglyphic views for the visual detection of high altitude solar structures whitout binocular vision;altitude solar structures whitout binocular vision;_ maps of a quantity related to the altitude of _ maps of a quantity related to the altitude of structures.structures. _we further indicated how to calibrate this _we further indicated how to calibrate this quantity into altitudes.quantity into altitudes. Further work: Further work:_ time studies of transient events;_ time studies of transient events;_ study of high cadence 304A observations;_ study of high cadence 304A observations;_ 171A, 195 and 284 observations;_ 171A, 195 and 284 observations;_ taking into account the epipolar relation._ taking into account the epipolar relation.


1 mars 20071 mars 2007

30 mai 30 mai 20072007

27 avril 200727 avril 2007

7 juin 7 juin 20072007

9 septembre 20079 septembre 2007

26mai200726mai2007

26 août 200726 août 2007

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Meudon April 22, 2008