The Sun: just a star, like many others...
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ZA-Sunspot.jpgSunspot and Solar "granules" (detail mgnf)65 visiteCaption NASA originale:"Sometimes, small regions of the Sun appear unusually dark. Visible above is a close-up picture of a sunspot, a depression on the Sun's face that is slightly cooler and less luminous than the rest of the Sun. Sunspots can be larger than the Earth and usually last for only a few days. As you can see, the Sun's face is a bubbling sea of separate cells of hot gas. These cells are known as "granules" and a solar "granule" is about 1000 Km across and "lives" for + or - 10 minutes, then explodes".
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ZB-The_Sun_1.jpgPlasma Waves (1)174 visiteDue stupende immagini che ci mostrano il Sole come mai lo avevamo visto prima: provengono dall'Inouye Solar Telescope. Tuttavia, l'importanza scientifica di questo strumento è comunque oggetto di controversia.
Esso è stato costruito sul vulcano Maui, Haleakalā, che è culturalmente e spiritualmente importante per i Nativi Hawaiani. Una parte della popolazione, infatti, sembra averlo accettato eppure c'è chi lo considera un affronto e una costruzione dei colonizzatori bianchi. E forse i Nativi hanno ragione...
MareKromium
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ZB-The_Sun_2.jpgPlasma Waves (2)176 visiteOnde di Plasma che fluiscono nella Corona da una sorta di schema di pori a nido d'ape. Queste "bolle di Plasma" sono anche conosciute come "Granuli" e ciascuna è larga circa 1.600 Km. Ognuno di questi due frame è largo circa 82.500 Km.
MareKromium
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ZZ-PIA00450.jpgThe Sun from 4 Billion Miles - Voyager 267 visiteCaption NASA originale:"This image of the Sun was taken by the Voyager 1 on Feb. 14, 1990, when it was approximately 32° above the plane of the ecliptic and at a slant-range distance of approximately 4BM. It is the first - and may be the only - time that we will ever see our Solar System from such a vantage point. This image is a portion of a wide-angle image containing the Sun and the region of space where the Earth and Venus were at the time. The wide-angle was taken with the camera's darkest filter (a methane absorption band) and the shortest possible exposure (5/1000 sec.) to avoid saturating the camera's vidicon tube with scattered sunlight. The Sun is not large in the sky as seen from Voyager's perspective at the edge of the Solar System but is still 8M times brighter than the brightest star in Earth's sky: Sirius.
The result of the brightness is a bright burned out image with multiple reflections from the optics in the camera. The "rays" around the Sun are just a diffraction effect".
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ZZ-The Sun.jpgAutumnal Equinox 199454 visiteDa "NASA - Picture of the Day" del 20 Marzo 2005:"Today, the Sun crosses the celestial equator heading North, marking the Vernal Equinox - such as the 1st day of Spring in the Northern Hemisphere and Autumn in the south. Equinox means equal night and with the Sun on the celestial equator, Earthlings will experience 12 hours of daylight and 12 hours of darkness. For those in the Northern Hemisphere, the days will continue to grow longer with the Sun marching higher in the sky as Summer approaches. A few weeks after the northern Autumnal Equinox of 1994, the Crew of the Shuttle Endeavor recorded this image of the Sun poised above the Earth's limb. Glare illuminates Endeavor's vertical tail (pointing toward the Earth) along with radar equipment in the payload bay. The space shuttle is expected to return to flight later this year with the launch of STS-114".
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ZZ-ZZ-Annular_seip_big.jpgThe "Annular Eclipse" of October, 3rd, 2005 (HR)54 visiteDa "NASA - Picture of the Day" del 5 Ottobre 2005:"On Monday, part of the Sun went missing. The missing piece was no cause for concern because the Moon was only momentarily in the way. The event was not a total eclipse of the Sun for any Earth-bound sky enthusiast but rather, at best, an annular eclipse, where the Moon blocked most of the Sun. Because of the relatively large distance to the Moon during this Earth-Moon-Sun alignment, the Moon did not have a large enough angular size to block the entire Sun. Those who witnessed the solar eclipse from a narrow path through Spain and Africa, however, were lucky enough to see the coveted Ring of Fire, a dark Moon completely surrounded by the brilliant light of the distant Sun. Pictured above is a Ring of Fire captured two days ago in unusually HR above Spain. The resulting image shows details of the granular solar surface as well as many prominences around the Sun".
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ZZ-ZZ-HybridEclypse-Espenak_tse2005_1.jpgAn unusual "Hybrid Solar Eclipse" (1)55 visiteDa "NASA - Picture of the Day" del 6 Maggio 2005:"April's spectacular geocentric celestial event was a rare Hybrid Eclipse of the Sun - such as a total or an annular eclipse could be seen depending on the Observer's location.
For Fred Espenak, aboard a gently swaying ship within the middle of the Moon's shadow track about 2.200 Km west of the Galapagos, the eclipse was total, the lunar silhouette exactly covering the bright solar disk for a few brief moments.
His camera captured a picture of totality revealing the extensive Solar Corona and prominences rising above the Sun's edge".
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ZZ-ZZ-HybridEclypse-Heinsius_Panama_tse2005_1.jpgAn unusual "Hybrid Solar Eclipse" (2)61 visiteDa "NASA - Picture of the Day" del 6 Maggio 2005:"(...) But for Stephan Heinsius, near the end of the shadow track at Penonome Airfield, Panama, the Moon's apparent size had shrunk enough to create an anular eclipse, showing a complete anulus of the Sun's bright disk as a dramatic "Ring of Fire".
(...) How rare is such a Hybrid Eclipse?
Calculations show that during the 21st century just 3,1% (7 out of 224) of Solar Eclipses are hybrid while hybrids comprise about 5% of all Solar Eclipses over the period from 2.000 BC to AD 4.000".
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ZZ-ZZ-ZZ-1-The_Sun-Full-Disk_171_final.gifBright Flare (GIF-Movie - normal)152 visitenessun commentoMareKromium
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ZZ-ZZ-ZZ-2-The_Sun-CU_171_final.gifBright Flare (GIF-Movie - EDM)154 visitenessun commentoMareKromium
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ZZ-ZZ-ZZ-3-The_Sun-FlareX13_20220330_171A_2048p30_Sq.gifThe always restless Sun... Sun-Flare X-13115 visitenessun commentoMareKromium
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