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Aurora Borealis - Norway.jpgBlack Aurora over Norway94 visiteDa "NASA - Picture of the Day" del 29 Marzo 2006:"What causes gaps between aurora curtains? These unusual gaps can make auroral displays appear more detailed and intricate. Research using data from four Cluster Spacecraft orbiting the Earth has likely found the secret: auroral gaps, sometimes knows as "black auroras", are actually anti-auroras. In normal auroras, electrons and/or predominantly negatively charged particles fall toward Earth along surfaces of constant magnetic field. They ionize the Earth's atmosphere on impact, causing the bright glows. In auroral gaps, however, negatively charged particles may be sucked out from the Earth's ionosphere along adjoining magnetic field lines. These dark anti-auroras can climb to over 20.000 Km and last for several minutes. Pictured above, a series of well-defined auroral gaps is seen dividing green aurora curtains high above Harstad, Norway, earlier this month".
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Aurora Borealis.jpgAurora over Wisconsin120 visiteLo "spettacolo" delle Aurore Boreali che stanno manifestandosi un p ovunque in Nord America non accenna a diminuire: questa si verificata nel Wisconsin. Ecco la caption originale da "NASA - Picture of the Day" del 17 Novembre 2004:"The auroral displays of the past week are being reported as some of the most beautiful in memory. In particular, impressive auroral bands fanned out over much of eastern North America after sunset on November 8. The multicolored aurora pictured above was caught reflecting in one of the many small lakes in central Wisconsin near that time. Continued solar activity might create more aurora visible over the next few nights as the Leonids meteor shower peaks". Non comprendiamo, a dire il vero, la curiosa relazione implicita che ci sembra essere stata fatta tra il verificarsi di queste Aurore ed i prossimo picco delle Leonidi.
Forse non abbiamo capito bene o magari ci sta semplicemente sfuggendo qualcosa...
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Aurora Borealis~0.jpgAurora Borealis over North Dakota89 visiteDa "NASA - Picture of the Day" del 20 Novembre 2005:"This aurora was a bit of a surprise. For starters, on this Friday morning in August 2002, no intense auroral activity was expected at all. Possibly more surprising, however, the aurora appeared to show an usual structure of green rays from some locations. In the above image, captured from North Dakota, USA, a picket fence of green rays stretches toward the horizon. Mirroring the green rays is a red band, somewhat rare in its own right. Lights from the cities of Bismarck and Mandan are visible near the horizon. Large sunspot groups indicate that activity from an active Sun is relatively likely, possibly causing other streams of energetic particles to cascade onto the Earth and so causing more auroras".
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Aurora_Borealis-Coronal_Aurora-1.jpg"Auroral Corona" from l'Observatoire de la Dcouverte in Val Belair near Quebec - Canada87 visiteDa "NASA - Picture of the Day" del 9 Novembre 2004: "...This fisheye picture captures a particularly active and colorful 'Auroral Corona' that occurred on November 7, 2004 (...) The above aurora has an unusually high degree of detail, range of colors and breadth across the sky. The vivid green, red, and blue auroral colors are likely caused by high atmospheric oxygen and hydrogen reacting to incoming electrons. The trigger events were magnetically induced explosions on the Sun from sunspot region 696 over the past few days. Continued activity from this active solar region could mean more auroras visible to northern observers over the next few days. Early in the morning but far in the background, planets, stars and the Moon will be simultaneously putting on their own show".
Una piccola (nostra) nota di commento: dietro la vivace bellezza dell'immagine ed i "romantici" commenti, c' un nuovo incremento dell'attivit solare in un periodo in cui, invece, il nostro Sole usualmente calmo.
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Aurora_Borealis-Coronal_Aurora-sep11aurora_moussette_f.jpgNorthern Lights over Canada78 visiteSo far, the Aurora Borealis - or "Northern Lights" - have made some remarkable visits to September's Skies. The reason, of course, is the not-so-quiet Sun. In particular, a large solar active region now crossing the Sun's disk has produced multiple, intense flares and a large Coronal Mass Ejection (CME) that triggered wide spread auroral activity just last weekend. This colorful example of spectacular curtains of aurora was captured with a fish-eye lens in skies over Quebec, Canada, on September 11, 2005.
Also featured is the planet Mars, the brightest object above and left center. Seen near Mars (just below and to the right) is the tightly knit Pleiades star cluster.
Although they can appear to be quite close, the Northern Lights actually originate at extreme altitudes, 100 Km or so above the Earth's surface.
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Aurora_Borealis-Coronal_Aurora.jpgCoronal Aurora near Warrensbourg - Missouri (USA)91 visiteIn relazione a quanto detto e scritto solo pochi giorni fa, ecco una nuova Aurora la quale, oltre ad essere stata particolarmente intensa (come potete ben vedere), accaduta ad un latitudine che di Polare o presso-Polare non ha proprio nulla. La NASA dice che un fenomeno inusuale ma "normale", vista l'attivit solare di questi giorni. Permetteteci, a questo riguardo, una battuta: proprio il fatto che sia la NASA a dire di non preoccuparci che ci fa preoccupare... EccoVi il commento originale da "NASA - Picture of the Day" del giorno 12.11.2004: "(...) Amazing! Unbelievable!, The best I've ever seen! ... They aren't talking about a movie, though. Instead, even casual sky critics are remarking on November's stunning auroral displays, visible with surprising intensities well beyond the confines of high latitudes where auroral activity is normally observed (...)". Vedete?!? Entusiasmo, eccitazione, linguaggio pi da show che da Scienza e dintorni: il nuovo corso della NASA...
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Chasma_Boreale-PSP_001374_2650_RED.jpgChasma Boreale (False Colors)135 visitenessun commentoMareKromium
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Chasma_Boreale-TRA_000840_2750_IRB-001-PCF-LXTT.jpgOn the Edge of Chasma Boreale (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)245 visitenessun commentoMareKromium
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Chasma_Boreale-TRA_000840_2750_IRB-004-PCF-LXTT.jpgOn the Edge of Chasma Boreale (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)296 visitenessun commentoMareKromium
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Chasma_Boreale-TRA_000840_2750_IRB-005-PCF-LXTT.jpgOn the Edge of Chasma Boreale (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)271 visitenessun commentoMareKromium
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Chasma_Boreale-TRA_000840_2750_IRB-005-PCF-LXTT_(2).jpgChasma Boreale (Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)279 visitenessun commentoMareKromium
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Clouds-Vastitas_Borealis_Region-PIA15567-PCF-LXTT-IPF.jpgSpringtime's Storm-Front over Vastitas Borealis (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)197 visiteOrbit Number: 45266
Latitude: 75,313 North
Longitude: 330,479 East
Instrument: VIS
Captured: February, 27th, 2012
Mars Local Solar Time: 10:49 (Late Morning Hours)MareKromium
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