Skip to comments.Astronomy Picture of the Day -- Ash and Lightning above an Icelandic Volcano
Posted on 04/20/2014 3:14:59 PM PDT by SunkenCiv
Explanation: Why did a picturesque 2010 volcanic eruption in Iceland create so much ash? Although the large ash plume was not unparalleled in its abundance, its location was particularly noticeable because it drifted across such well-populated areas. The Eyjafjallajökull volcano in southern Iceland began erupting on 2010 March 20, with a second eruption starting under the center of a small glacier on 2010 April 14. Neither eruption was unusually powerful. The second eruption, however, melted a large amount of glacial ice which then cooled and fragmented lava into gritty glass particles that were carried up with the rising volcanic plume. Pictured above during the second eruption, lightning bolts illuminate ash pouring out of the Eyjafjallajökull volcano.
(Excerpt) Read more at 18.104.22.168 ...
[Credit & Copyright: Sigurður Stefnisson]
It’s amazing that it’s still *called* Iceland, eh? :’)
...an oil-on-panel painting depicting a halo display, an atmospheric optical phenomenon, observed over Stockholm on April 20, 1535. It is named after the sun dogs...
However, when you look at the “clarity index” for 1960 through 2014, there is hardly a blip in actual atmosphere loss since 1964-65 (Guam), 1983, and then Pinatubo in the early 90’s.
Very, very abrupt and distinctive volcano impacts: but from this one!
Apparent Atmospheric Transmission of Solar Radiation at Mauna Loa, Hawaii
And, from that source, the original from the NOAA Mauna Loa Lab:
This is a fabulous photo. Thanks for posting.
Are We Doomed?
another extra — Halley’s Comet was at perihelion (closest approach to the Sun) on this day in 295 AD.
[snip] Since then it has been recorded at every perihelion. These occur every 74-80 years, its irregularity due to pertubations by Jupiter and Saturn. It returned in AD 66 (Perihelion: 26 January) and was first sighted by the Chinese on 31 January, later appearing in Capricorn and disappearing around 10 April; 141 (Perihelion: 22 March), when it was described as pale blue by the Chinese, being last seen in Leo; 218 (Perihelion: 17 May), when it was seen between Auriga and Virgo; 295 (Perihelion: 20 April), appearing in Andromeda and being last seen in Leo; 374 (Perihelion: 16 February), first seen in Aquarius on March 6; and 451 (Perihelion: 28 June), appearing in Taurus on 10 June and disappearing from Virgo on 15 August. [/snip]
My doctor once told me that the mortality rate is still 100 percent. Of course, he’s dead now...
Reality proves just how constrained our imaginations are.
Peter Jackson, “Now that’s what I’m talking about! That...that’s destruction of Mordor!”
In 1705, he published ‘A Synopsis of the Astronomy of Comets’, in which he described the parabolic orbits of 24 comets that had been observed from 1337 to 1698. He showed that the three historic comets of 1531, 1607, and 1682 were so similar in characteristics that they must have been successive returns of the same object - now known as Halley’s Comet - and accurately predicted its return in 1758.
Wayback, way way back. Good times...
Apollo 16 landed on the Moon on April 20, 1972.
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.