SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

Regularities in averaged granulation patterns

gannon-avila avatar
gannon-avila
18 diapositives · 305 Views · Nov 13, 2014

This study presents an in-depth analysis of solar surface magnetism through the examination of averaged granulation patterns derived from high-resolution photospheric images taken on June 5, 1993. Utilizing the Swedish Vacuum Solar Telescope, a series of images were aligned and processed to mitigate distortions and enhance features such as lineaments and circular structures. The software developed for this purpose revealed significant anisotropies in the detection of lineaments, while the contour detection showed promising results for further analysis.

#regularities in averaged granulation patterns #regularities in averaged granulation patterns ppt #powerpoint #presentation
Regularities in averaged granulation patterns - slide 1
01 / 18Regularities in averaged granulation patterns
1 / 17

Télécharger la présentation

Regularities in averaged granulation patterns
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. Regularities in averaged granulation patterns Alexander V. Getling Institute of Nuclear Physics Lomonosov Moscow State University Moscow, 119992 Russia

  2. La Palma series of photospheric imagesBrandt, Scharmer, & Simon, 5 June 1993Swedish Vacuum Solar Telescope • Spectral band: centre at 468 nm, width 10 nm • Duration: 11 h • Frame cadence: 21 s • Subset used here: time interval of duration 8 h • and subfield of size 43.5 × 43.5 Mm2 (60″ × 60″) • Resolution: no worse than 0.5 ″ • Contrast: 6–10.6 %

  3. Description of the series and data prereduction:G. W. Simon, P. N. Brandt,L. J. November, et. al. In Solar Surface Magnetism, eds. R. J. Rutten & C. J. Schrijver (Kluwer: Dordrecht, 1994), p. 261

  4. Data prereduction: • Alignment of contiguous images • LCT-based destretching (compensation for seeing-introduced distortions) • Subsonic Fourier filtering (cutoff phase speed of 4 km/s) • Fourier transform–based interpolation to equal time intervals

  5. Time averagingIndividual image 2-h-averaged image

  6. Target pattern of curved convection rollsExperiment:Assenheimer & Steinberg 1994

  7. Publications:A. V. Getling & P. N. Brandt • Astronomy and Astrophysics, 382 (1), L5–L8, 2002 • In Proc. 10th European Solar Physics Meeting “Solar Variability: From Core to Outer Frontiers”, Prague, Czech Republic, 9–14 September 2002 (ESA SP-506, December 2002), pp. 617–620

  8. Detection of lineaments,circular structures, and contours(nonparametric statistical criteria):A. A. Buchnev & V. P. PyatkinInstitute of Computational Mathematicsand Mathematical Geophysics,Novosibirsk

  9. The software packagewas developedto detect geological structuresin aerospace images

  10. Detection of lineaments and ringsfitting into frame(wide ranges of sizes)

  11. Detection of lineaments and ringsfitting into frame(narrower ranges of sizes)

  12. Detection of contours Contour = object with an unknown analytical representation Range of lengths: 16–24 px (pixel size: 0.125 ″; subfield: 480 × 480 px)

  13. Individual image Range of lengths: 32–240 px Averaged image Range of lengths: 16–240 px Angular distributions of lineaments

  14. Angular distribution of lineaments Range of lengths: 16–43 px

  15. Summary • In general, the software package detects mainly spurious circular structures • The angular distribution of the detected lineaments exhibits a strong anisotropy, despite many spurious features present • The detection of contours seems promising but requires a careful adjustment of the parameters

  16. Thank you for your attention