| Piú votate - The Sun: just a star, like many others... |
The Sun-Suncombo1G.jpgOur "restless" Sun... (10)67 visitenessun commento
(4 voti)
|
|
The Sun-EitplumeG.jpgOur "restless" Sun... (9)69 visitenessun commento
(4 voti)
|
|
The Sun-Eit171cfG.jpgOur "restless" Sun... (8)71 visitenessun commento
(4 voti)
|
|
The Sun-Eit002G_b.jpgOur "restless" Sun... (7)73 visitenessun commento
(4 voti)
|
|
The Sun-C2dblast.jpgOur "restless" Sun... (3)78 visitenessun commento
(4 voti)
|
|
The Sun-20031202_c2_EIT304.jpgOur "restless" Sun... (1)74 visitenessun commento
(4 voti)
|
|
Sunspot-reversed-1.jpgSunspot-905: a sign of an incoming new "Solar Cycle"? (2)67 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)
|
|
Mercury and the Sun.jpgA "Superior Conjunction" Of Mercury67 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)
|
|
The_Sun-Spicules.jpgSpiculae in Solar Region 11092114 visiteCaption NASA:"Imagine a pipe as wide as a state and as long as the Earth. Now imagine that this pipe is filled with hot gas moving 50.000 Km per hour. Further imagine that this pipe is not made of metal but a transparent Magnetic Field. You are envisioning just one of thousands of young Spicules (Spiculae) on the active Sun.
Pictured above is one of the highest resolution image yet of these enigmatic Solar Flux Tubes. Spicules line the above frame of SAR 11092 that crossed the Sun last month, but are particularly evident converging on the Sunspot on the lower right.
Time-sequenced images have recently shown that Spicules last about five minutes, starting out as tall tubes of rapidly rising gas but eventually fading as the gas peaks and falls back down to the Sun. What determines the creation and dynamics of Spicules still remains a topic of the active Solar Research".MareKromium
(3 voti)
|
|
The_Sun-489332main_euvfilament-20101016-2.jpgIntense Solar Activity on the Sun: Sunspot 1112 and Solar Flares84 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)
|
|
Solar_Corona-TSE2010_JLD4.jpgThe "Crown" of the Sun82 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)
|
|
Sungrazer-2010-SOHO.jpgSungrazer66 visiteCaption NASA:"Intense and overwhelming, the direct glare of the Sun is blocked by the smooth occulting disk in this image from the Sun-staring SOHO Spacecraft. Taken on January 3rd, 2010, an extreme UltraViolet image of the Sun to scale, is superimposed at the center of the disk. Beyond the disk's outer boundary, is a Sungrazer Comet, one of the brightest yet seen by SOHO.
The comet was discovered by an Australian Amateur Astronomer, Alan Watson, while examining earlier images from another Sun-watching Spacecraft, STEREO-A. Based on their orbits, Sungrazers are believed to belong to the Kreutz family of comets, created by successive break ups from a single large Parent Comet that passed very near the Sun in the twelfth century.
Subjected to strong Tidal Forces and intense Solar Heat, this Sungrazer did not survive its close encounter".MareKromium
(3 voti)
|
|
| 144 immagini su 12 pagina(e) |
 |
|
|
|
|
|
|
9 | |
|
|
