| Piú votate - The Sun: just a star, like many others... |
Sunspot.jpgSunspots' Region 87592 visiteCaption NASA originale (da "NASA - Picture of the Day" del 2 Maggio 2006):"An unusually active Sunspot Region is now crossing the Sun.
The Region, numbered 875, is larger than the Earth and has produced several Solar Flares over the past week. It should take a few more days for Sunspot 875 to finish crossing the solar disk. The above image of the Sun was taken last Wednesday in a very specific color of red light to bring up detail. Sunspot 875, in the midst of erupting a large "Class C" Solar Flare, can be seen as the dark region to the upper right. In the above image, relatively cool regions appear dark while hot regions appear bright.
On the far left, solar prominences are visible hovering above the Sun's surface".
(6 voti)
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Solar Eclipse 2006.jpgFrom Space, from Earth...68 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".
(6 voti)
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ZZ-ZZ-ZZ-1-The_Sun-Full-Disk_171_final.gifBright Flare (GIF-Movie - normal)168 visitenessun commentoMareKromium
(5 voti)
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ZZ-ZZ-ZZ-2-The_Sun-CU_171_final.gifBright Flare (GIF-Movie - EDM)168 visitenessun commentoMareKromium
(5 voti)
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ZZ-ZZ-ZZ-3-The_Sun-FlareX13_20220330_171A_2048p30_Sq.gifThe always restless Sun... Sun-Flare X-13131 visitenessun commentoMareKromium
(5 voti)
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A_-_The_Sun_-_Sunspots_-_Friedman.jpgFeatures of the Sun (picture taken in H-Alpha - False Colors)151 visiteTaken just last week (second week of November 2011), the Sun was captured sporting numerous interesting features including one of the larger Sunspot Groups yet recorded: AR 1339 visible on the image right. Only last year, the Sun was emerging from an unusually quiet Solar Minimum that lasted for years. The above image was recorded in a single color of light called Hydrogen Alpha, inverted, and false colored. Spicules cover much of the Sun's face. The gradual brightening towards the Sun's edges is caused by increased absorption of relatively cool solar gas and called limb darkening. Just over the Sun's edges, several scintillating Prominences protrude, while Prominences on the Sun's face are seen as light streaks. Possibly the most visually interesting of all are the magnetically tangled active regions containing cool Sunspots. As our Sun's Magnetic Field winds toward Solar Maximum over the next few years, increased activity will likely create times when the Sun's face is even more complex.MareKromium
(5 voti)
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A-The_Sun-SOHO-LASCO-1.gifA Day of the Sun (a GIF-Movie by Dr Gianluigi Barca - Lunexit Team)97 visitenessun commentoMareKromium
(5 voti)
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A-The_Sun-SOHO-LASCO-2.gifA Day of the Sun (a GIF-Movie by Dr Gianluigi Barca - Lunexit Team)98 visitenessun commentoMareKromium
(5 voti)
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Solar_Prominence-SOHO.jpgSolar Prominence118 visiteCaption NASA:"What's that coming over the edge of the Sun? What might appear at first glance to be some sort of Sun monster is actually a Solar Prominence. The above Prominence, captured by the Sun-orbiting SOHO satellite earlier this year during an early stage of its eruption, rapidly became one of the largest ever on record.
Even as pictured, the Prominence is huge -- the Earth would easily fit inside. A Solar Prominence is a thin cloud of Solar Gas held just above the Surface by the Sun's Magnetic Field.
A "Quiescent Prominence" typically lasts about a month, while an "Eruptive Prominence" like the one developing above may erupt within hours into a Coronal Mass Ejection (CME), expelling hot gas into the Solar System. Although very hot, Prominences typically appear dark when viewed against the Sun, since they are slightly cooler than the surface. As our Sun evolves toward Solar maximum over the next three years, more large eruptive prominences are expected".MareKromium
(5 voti)
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Solar_Corona~0.jpgDeep Coronal Holes117 visiteCaption NASA:"This ominous, dark shape sprawling across the face of the Sun is a Coronal Hole -- a low density region extending above the Surface where the Solar Magnetic Field opens freely into interplanetary space.
Studied extensively from space since the 1960s in UltraViolet and X-Ray Light, Coronal Holes are known to be the source of the high-speed Solar Wind (such as atoms and electrons which flow outward along the open Magnetic Field lines). During periods of low activity, Coronal Holes typically cover regions just above the Sun's Poles.
But this extensive Coronal Hole dominated the Sun's Northern Hemisphere earlier this week, captured here in Extreme UV Light by cameras onboard the Solar Dynamics Observatory. The solar wind streaming from this Coronal Hole triggered auroral displays on Earth".MareKromium
(5 voti)
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Solar_Eclipse-2010.jpgMillennium's Annular Solar Eclipse80 visiteDa "NASA - Picture of the Day" del giorno 22 Gennaio 2010:"The Moon's shadow raced across planet Earth on January 15, 2010.
Observers within the central shadow track were able to witness an Annular Solar Eclipse as the Moon's apparent size was too small to completely cover the Sun. A visually dramatic "Ring of Fire", the annular phase lasted up to 11' and 8", depending on location: the longest Annular Solar Eclipse for the next 1000 years.
This picture of the Moon's silhouette just before mid-eclipse was taken within the eclipse path from the city of Kanyakumari at the southern tip of India. The telescopic image was made through a filter that blocks most Visible Light, but still transmits light from Hydrogen Atoms.
As a result, detailed mottling, or granulation, caused by heat convection in the Sun's Atmosphere can be seen around the dark Lunar Disk".MareKromium
(5 voti)
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Solar_Prominence.jpgSolar Prominence77 visiteCaption NASA, da "NASA - Picture of the Day" del giorno 15 Marzo 2009:"What's happened to our Sun? It was sporting a spectacular -- but not very unusual -- Solar Prominence.
A Solar Prominence is a cloud of solar gas held above the Sun's Surface by the Sun's Magnetic Field. In 2004, NASA's Sun-orbiting SOHO Spacecraft imaged an impressively large prominence hovering over the surface, pictured above.
The Earth would easily fit under the hovering curtain of hot gas.
A quiescent Prominence typically lasts about a month, and may erupt in a Coronal Mass Ejection (CME) expelling hot gas into the Solar System. Although somehow related to the Sun's changing Magnetic Field, the energy mechanism that creates and sustains a Solar Prominence is still a topic of research".MareKromium
(5 voti)
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