| Risultati della ricerca nelle immagini - "Lights" |
PHOE-SOL010-lg_82.jpgLights ON!55 visiteRicordate quando abbiamo detto che il colore del terriccio recuperato da Phoenix per le analisi era "falsissimo" oppure illuminato da una sorgente molto intensa e prossima? Ok. Ecco, nell'immagine, la "sorgente" in questione: un gruppo-luce costituito da leds blu, rossi e verdi. Sicuramente utili in alcuni casi ed altrettanto sicuramente fuorvianti in altre situazioni.
Comunque sia: "Lights ON" (!) e fine del mini-mistero relativo al colorito assurdo del suolo Marziano raccolto e fotografato da Phoenix.MareKromium
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Saturn-PIA21899.gifPolar Lights (Auroral Emissions from the North Pole of Saturn)112 visiteCaption NASA Originale:"On Sept. 14, 2017, one day before making its final plunge into Saturn's Atmosphere, NASA's Cassini Spacecraft used its Ultraviolet Imaging Spectrograph, or UVIS, instrument to capture this final view of Ultraviolet Auroral Emissions over the Planet's North Polar Regions.
The view is centered on the North Pole of Saturn, with lines of Latitude visible for 80, 70 and 60°. Lines of Longitude are spaced 40° apart. The Planet's Day-Side is at the bottom of the picture, while the Night-Side is at the top. A sequence of images from this observation has also been assembled into a movie sequence. The last image in the movie was taken about an hour before the still image, which was the actual final UVIS auroral image.
Auroral Emissions are generated by charged particles traveling along the invisible lines of Saturn's Magnetic Field. These particles (then) precipitate into the Atmosphere, releasing light when they strike (the) Gas Molecules (that are present) there.
Several individual auroral structures are visible here, despite that this UVIS view was acquired at a fairly large distance from the Planet (such as about 424.000 miles or approx. 682.361,856 Km). Each of these features is connected to a particular phenomenon (occurring) in the Saturnian Magnetosphere. For instance, it is possible to identify Auroral "signatures" here that are related to the injection of "Hot Plasma" from the Day-Side Magnetosphere, as well as Auroral Features associated with a change in the Magnetic Field's shape (existing) on the Magnetosphere's Night-Side.
Several possible scenarios have been postulated over the years to explain Saturn's changing Auroral Emissions, but researchers are still far from a complete understanding of this complicated puzzle. Researchers will continue to analyze the hundreds of image sequences UVIS obtained of Saturn's auroras during Cassini's 13-year mission, with many new discoveries likely to be made.
This image and movie sequence were produced by the Laboratory for Planetary and Atmospheric Physics (LPAP) of the STAR Institute of the University of Liege in Belgium, in collaboration with the UVIS Team".MareKromium
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ZZ-ZZ-ZZ-ZZ-ZZ-ZZ-ZZ-ZZ-ZZ-ZZ-ZZ-ZZ-APOLLO 12 AS 12-46-6769 HR.jpgAS 12-46-6769 (HR) - Blue Flare or reflections?125 visiteUna nuova (piccola-piccola) "Blue Flare" illumina il cielo al di sopra del Surveyor Crater? No.
In questo frame, la Blue Flare è solo un'illusione. Anzi, ad essere precisi, essa è la porzione terminale di un photoartifact ricorrente nelle immagini Up-Sun (controluce) che viene comunemente identificato come "effetto prismatico". Un effetto prismatico che diventa ancora più accattivante - ma ingannevole! - a causa della sfuocatura della fotografia.
Caption originale:"116:27:03 MT - Rightward of 6768. Frame from Pete's 8 o'clock pan showing the deep shadow on the eastern wall of Surveyor Crater and, as indicated in a detail, the sunlit solar panels of Surveyor III. Compare with the corresponding frames from Pete's 12 o'clock pan, AS 12-46-6741, and his 4 o'clock pan, AS12-46-6746. Note that Pete mistakenly took these pans at 15-foot focus rather than 74-foot focus".
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