| Piú votate - The Sun: just a star, like many others... |
The Sun-C3bulb_crop.jpgOur "restless" Sun... (5)54 visitenessun commento
(4 voti)
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The Sun-C2helixG.jpgOur "restless" Sun... (4)54 visitenessun commento
(4 voti)
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The Sun-C2_EIT_Nov8_00G.jpgOur "restless" Sun... (2)54 visitenessun commento
(4 voti)
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Sunspot-reversed-1.jpgSunspot-905: a sign of an incoming new "Solar Cycle"? (2)56 visiteDa "NASA - Picture of the Day" del 30 Agosto 2006:"An indicator that the Sun's magnetic field is reversing is the appearance of sunspots with the reverse magnetic polarity.
A few weeks ago, one small candidate "reverse sunspot" was sited but faded quickly. Now, however, a larger sunspot with negative polarity is being tracked. This sunspot, numbered 905, appears as the unusual white spot in the above magnetic image of the Sun taken with the SOHO spacecraft a few days ago. In the past few days, Sunspot-905 has actually begun to break apart and might also become the source of coronal mass ejections and explosive solar flares.
Solar astronomers predict that the coming Solar Maximum will be unusually active".
(4 voti)
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Solar Eclipse 2006.jpgFrom Space, from Earth...55 visiteDa "NASA - Picture of the Day" del 31 Marzo 2006:"Neither rain, nor snow, nor dark of night can keep the space-based SOlar Heliospheric Observatory (SOHO) from watching the Sun. In fact, from its vantage point 150 MKM sunward of planet Earth, SOHO's cameras can always monitor the Sun's Outer Atmosphere, or Corona.
But only during a total solar eclipse can earth-based observers see the lovely coronal streamers and structures - such as when the Moon briefly blocks the overwhelmingly bright solar surface.
In this composite view, SOHO's uninterrupted view of the Solar Corona above the Solar Photosphere (center) and Corona far beyond the Sun's disk, are shown in orange hues. The middle, donut-shaped region is the Corona as recorded by the Williams College Eclipse Expedition to Kastelorizo Island, Greece during the March 29th, 2006 total solar eclipse.
Merging ground and space-based views allows astronomers to trace features in the Corona that reach from just above the Sun's surface into the Solar Wind".
(4 voti)
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The Sun-W00011347.jpgThe Sun from Cassini55 visiteOriginal caption:"W00011347.jpg was taken on October 23, 2005 and received on Earth October 24, 2005. The camera was pointing toward SATURN-E-RING at approximately 6.847.402 kilometers away and the image was taken using the CL1 and IRP0 filters. This image has not been validated or calibrated".
Secondo noi questa è un'immagine del Sole e non un'istantanea relativa all'Anello E di Saturno. Un'immagine ottenuta casualmente: uno scatto nel buio, mentre una delle fotocamere di Cassini "cercava" l'Anello E.
(4 voti)
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Mercury and the Sun.jpgA "Superior Conjunction" Of Mercury55 visiteCaption originale NASA dal "NASA - Picture of the Day" dell'8-9-1999: "In astronomical parlance, an interior planet is at "Superior Conjunction" when it is located on the opposite side of the Sun from Earth. Mercury, the solar system's innermost planet, zips past this point in its orbit today. In fact, in this picture (taken on September 1999) from a solar coronagraph on board the the space-based SOHO observatory, shows Mercury positioned very close to the Sun as seen from a near Earth vantage point. The coronagraph uses an internal occulting disk to block the intense solar glare which otherwise hides this sight from ground-based observers. The shadow of the occulting disk is at the center with the Sun's size and position indicated by the white circle. Mercury is the bright dot with a horizontal line (a digital artifact), while faint dots scattered throughout the field are stars. Bright regions of the sun's outer atmosphere are also visible".
(4 voti)
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ZB-The_Sun_1.jpgPlasma Waves (1)179 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
(3 voti)
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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
(3 voti)
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The_Sun-489332main_euvfilament-20101016-2.jpgIntense Solar Activity on the Sun: Sunspot 1112 and Solar Flares73 visiteOctober 16, 2010 - Fast-growing sunspot 1112 is crackling with solar flares. The three strongest of this 24 hour period: an M3-flare at 1910 UT on Oct. 16th, a C1-flare at 0900 UT and another C1-flare at 1740 UT on Oct. 17th. So far, none of the blasts has hurled a substantial CME (Coronal Mass Ejection) toward Earth.
In addition, a vast Filament of Magnetism is cutting across the Sun's Southern Hemisphere, measuring about 400.000 Km. A bright 'hot spot' just North of the Filament's midpoint is UV radiation from Sunspot 1112.
The proximity is no coincidence; the filament appears to be rooted in the Sunspot below. If the Sunspot flares, it could cause the entire structure to erupt. But so far, none of the Flares has destabilized the Filament.MareKromium
(3 voti)
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Solar_Corona-TSE2010_JLD4.jpgThe "Crown" of the Sun66 visiteDalla Rubrica "NASA - Picture of the Day" del giorno 21 Luglio 2010:"During a total Solar Eclipse, the Sun's extensive Outer Atmosphere, or Corona, is an inspirational sight. Subtle shades and shimmering features that engage the eye span a brightness range of over 10,000 to 1, making them notoriously difficult to capture in a single photograph.
But this composite of 7 consecutive digital images over a range of exposure times comes close to revealing the Crown of the Sun in all its glory. The telescopic views were recorded from the Isla de Pascua (Easter Island) during July, 11th, 2010 Total Solar Eclipse and also show solar prominences extending just beyond the edge of the eclipsed Sun.
Remarkably, features on the dim, Near Side of the New Moon can also be made out, illuminated by Sunlight reflected from a Full Earth".MareKromium
(3 voti)
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The_Sun-Texture.jpgThe "Texture" of the Sun54 visiteUp close, the Solar Surface is a striking patch work of "granules" in this very High Resolution picture of the quiet Sun. Caused by convection, the granules are hot, rising columns of plasma edged by dark lanes of cooler, descending plasma. But the HR view reveals that the dark lanes are dotted with many small, contrasting bright points. Constantly present on the Solar Surface, the bright points do not seem to be related to Sunspots that come and go with the Magnetic Solar Cycle.
Nonetheless, the bright points are regions of concentrated Magnetic Fields and are bright because the magnetic pressure opens a window to hotter deeper layers below the Photosphere. For scale, the white bar at the lower left corresponds to approx. 5000 Km across the Sun's Surface.
The sharp, narrow-band image was recorded in September, 2007 using the Swedish Solar Telescope on the astronomical island of La Palma.MareKromium
(3 voti)
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