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Meudon April 22, 2008

Measurements of the altitudes of solar filaments Guy Artzner Institut d’Astrophysique Spatiale Orsay Guy.artzner@m4x.org ftp://ftp.ias.u-psud.fr/gartzner/ftp_projet/Secchi/. Meudon April 22, 2008.

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Meudon April 22, 2008

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  1. Measurements of the altitudes of solar filamentsGuy ArtznerInstitut d’Astrophysique SpatialeOrsayGuy.artzner@m4x.orgftp://ftp.ias.u-psud.fr/gartzner/ftp_projet/Secchi/ Meudon April 22, 2008

  2. STEREO Secchi EUVI 304ASmall basis Large basismay 1st ,2007 03h 51m no adjustments: strenuous crossed viewing Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  3. STEREO Secchi EUVI 304ASmall basis Wide basismay 1st ,2007 03h 51m crossed views: Visually correct adjustment with StereoPhotoMaker procedure Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  4. STEREO Secchi EUVI 304ASmall basis wide basismay 1st ,2007 03h 51m Visually correct adjustment with FITS parameters Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  5. STEREO Secchi EUVI 304ASmall basis Large basismay 1st ,2007 03h 51m Stereo PhotoMaker Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  6. STEREO Secchi EUVI 304ASmall or wide basisNumerical projection methodEvery point Pa of a (right) view from STEREO-A has two integer coordinatesiaand 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 Mat the intersection of the line of sight with the sphere of radiusR centered on the Sun’s center.We then compute the image coordinates iband 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. Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  7. LUNIK IIIHistoire de deux planètesGérard P. KuiperL’Astronomie , pp. 322-328, nov. 1962

  8. STEREO Secchi EUVI 304ASmall basis Large basismay 1st ,2007 03h 51m STEREO-B view projected on the STEREO-A viewaccording to the FITS headers Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  9. STEREO Secchi EUVI 304ASmall basis Large basismay 1st ,2007 03h 51m STEREO-B view projected on the STEREO-A viewafter an automaticadjustment ofONE angularparameter Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  10. 700 Mm 710Mm720Mm 730Mm

  11. STEREO Secchi EUVI 304ASmall basis Large basismay 1st ,2007 03h 51m Medicis correlator Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  12. STEREO Secchi EUVI 304ASmall basis45.2° large basisfebruary 2 ,2008 00h06m 2008 600 seconds cadence500 pixels parallax Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  13. STEREO Secchi EUVI 304ASmall basis45.2° large basisfebruary 2 , 19h56m - february 3, 05h06m 2008 600 pixels parallax Medicis correlator Reference Zone Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  14. STEREO Secchi EUVI 304ASmall basisLarge basisMedicis correlatorX: time february 1 , 19h56m - february 3, 05h06m 2008 Reference ZoneY: amount of the east-west component of the average vector between homologous points-2 to +6 pixels: 7 000 km solar asphericity OR residual defects of relative adjustments between A and B? Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  15. STEREO Secchi EUVI 304ASmall basis45.2° large basisfebruary 2 , 19h56m - february 3, 05h06m 2008 600 pixels parallax Medicis correlator Zone#1 Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  16. STEREO Secchi EUVI 304ASmall basisLarge basisMedicis correlatorX: time february 1 , 19h56m - february 3, 05h06m 2008 Zone#1Y: east-west location of the barycenter of the largest connex region where the east-west component of the correlation vector is larger than 10 pixelsa) effect of the solar rotationb) the «horizontal» size of the frame is too small Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  17. STEREO Secchi EUVI 304ASmall basis45.2° large basisfebruary 2 , 19h56m - february 3, 05h06m 2008 500 pixels parallax Medicis correlator Zone#2 Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  18. STEREO Secchi EUVI 304ASmall basisLarge basisMedicis correlatorX: time february 1 , 19h56m - february 3, 05h06m 2008 Zone#2Y: east-west location of the barycenter of the largest connex region where the east-west component of the correlation vector is larger than 10 pixelsa) effect of the solar rotationb) the «horizontal» size of the frame is large enough in order to follow a solar structure Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  19. STEREO Secchi EUVI 304ASmall basisLarge basisMedicis correlatorX: time february 1 , 19h56m - february 3, 05h06m 2008 Zone #2Y: amount of the east-west component of the average vector between homologous points over the largest connex region where this quantity is larger than 10 pixels Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  20. STEREO Secchi EUVI 304ASmall basisLarge basisMedicis correlatorX: time february 1 , 19h56m - february 3, 05h06m 2008 Zone #2Y: amount of the east-west component of the average vector between homologous points over the largest connex region where this quantity is larger than 20 pixels Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  21. STEREO Secchi EUVI 304ASmall basisLarge basisMedicis correlatorX: time february 1 , 19h56m - february 3, 05h06m 2008 Zone #2Y: amount of the east-west component of the average vector between homologous points over the largest connex region where this quantity is larger than 30 pixels Altitude of solar filaments Guy Artzner Meudon April 22, 2008

  22. STEREO Secchi EUVI 304ASmall basis Large basis CONCLUSIONSFor STEREO Secchi EUVI 304A images with a separation angle as high as 45° we produced:_ anaglyphic views for the visual detection of high altitude solar structures whitout binocular vision;_ maps of a quantity related to the altitude of structures. _we further indicated how to calibrate this quantity into altitudes. Further work:_ time studies of transient events;_ study of high cadence 304A observations;_ 171A, 195 and 284 observations;_ taking into account the epipolar relation. Altitude of solar filaments Guy Artzner Meudon April 22, 2008

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