Tout sur le Soleil

Le soleil en directCet article compilé par Thierry Valin, membre de la SAH, donne un point assez exhaustif des diverses images accessibles en temps réel et mises en ligne par des observatoires spécialisés. L'article est écrit en anglais.

Les dernières images en provenance de SOHO

Le télescope EIT (Extreme ultraviolet Imaging Telescope) observe l'atmosphère solaire dans diverses longueurs d'ondes et montre ainsi la surface solaire à des températures différentes. Dans les imagaes prises à 30,4 nm (He II), les zones claires sont entre 60 et 80 000 degrés. Les images prises à 17,1 nm (Fe IX, X) sont à 1 million de degrés. À 19,5 nm (Fe XII) la température est de 1,5 millions de degrés, 28,4 nm (Fe XV) correspond à 2 millions de degrés. Plus la température est élevée plus on observe des couches élevées de l'atmosphère solaire.

EIT 171 EIT 195 EIT 284 EIT 304
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The MDI (Michelson Doppler Imager) images shown here are taken in the continuum near the Ni I 6768 Angstrom line. The most prominent features are the sunspots. This is very much how the Sun looks like in the visible range of the spectrum (for example, looking at it using special 'eclipse' glasses: Remember, do not ever look directly at the Sun!). The magnetogram image shows the magnetic field in the solar photosphere, with black and white indicating opposite polarities. LASCO (Large Angle Spectrometric Coronagraph) is able to take images of the solar corona by blocking the light coming directly from the Sun with an occulter disk, creating an artificial eclipse within the instrument itself. The position of the solar disk is indicated in the images by the white circle. The most prominent feature of the corona are usually the coronal streamers, those nearly radial bands that can be seen both in C2 and C3. Occasionally, a coronal mass ejection can be seen being expelled away from the Sun and crossing the fields of view of both coronagraphs. The shadow crossing from the lower left corner to the center of the image is the support for the occulter disk.
C2 images show the inner solar corona up to 8.4 million kilometers (5.25 million miles) away from the Sun.
C3 images have a larger field of view: They encompass 32 diameters of the Sun. To put this in perspective, the diameter of the images is 45 million kilometers (about 30 million miles) at the distance of the Sun, or half of the diameter of the orbit of Mercury. Many bright stars can be seen behind the Sun.
SDO/HMI Continuum SDO/HMI Magnetogram LASCO C2 LASCO C3
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