http://www.liveleak.com/browse?channel_token=c53_1302947357 Items in channel 'Shanay' Sat, 18 May 2013 04:49:18 -0400 Liveleak http://edge.liveleak.com/80281E/u/u/ll2/logo.gif http://www.liveleak.com/browse?channel_token=c53_1302947357 Mon, 07 Jul 2008 04:12:11 -0400 http://www.liveleak.com/view?i=503_1215418331 Shanay The Great Daylight 1972 Fireball (or US19720810) is an Earth grazer meteoroid which passed within 57 kilometres of the surface of the Earth at 20:29 UTC on August 10, 1972. It entered the Earth's atmosphere in daylight over Utah, United States (1430 local time) and passed northwards leaving the atmosphere over Alberta, Canada. It was seen by many people and recorded on film and by space borne sensors. By comparison, the Otto C. Winzen developed balloon reached 51.8 kilometres in 1972 and Low Earth Orbit satellites orbit from about 200 kilometres from the surface of the Earth. Analysis of its appearance and trajectory showed it was a meteoroid about 3 (if a carbonaceous chondrite) to 14 metres (if made of cometary ices) in diameter in the Apollo asteroid class in an Earth-crossing orbit that would make a subsequent close approach to Earth in August 1997. In 1994 Zdenek Ceplecha re-analysed the data and suggested the passage would have reduced the meteoroid's mass to about a third or half of its original mass (reducing its diameter to 2 to 10 metres). The meteoroid's 100 second passage through the atmosphere reduced its velocity by about 800 metre per second and the whole encounter significantly changed its orbital inclination from 15 degrees to 8 degrees. This was the first Earth grazing fireball observed. As of 2008 only three subsequent Earth grazers have been seen: the Earth-grazing fireball of October 13, 1990 passing at around 100 kilometres altitude over Czechoslovakia; the possible Earth-grazing fireball on March 29, 2006 over Japan, and EN070807 (see All known Earth-grazing fireballs). What if it had impacted? If it had not entered at such a grazing angle, this meteoroid would have lost all its velocity in the upper atmosphere, possibly ending in an airburst, and any remnant would have fallen at terminal velocity. Atmospheric entry of meteoroids is complex and a full calculation requires a full simulation, but a highly simplified calculation can be made using the web-based program by Collins et al. Note: this took place in Grand Teton National Park, I couldn't find an exact city so I just stuck Salt Lake City in, based on the path of the meteor. Meteor Path Source: Wikipedia Article Source: NewWest.net http://www.liveleak.com/view?i=503_1215418331 Shanay The Great Daylight Fireball-1972 aka Grand Teton Meteor The,Great,Daylight,Fireball,1972,Grand,Teton,Meteor,near,hit,space,disaster Mon, 07 Jul 2008 03:58:48 -0400 http://www.liveleak.com/view?i=39e_1215417528 Shanay Characteristics of Blue Jets Blue jets are a second high altitude optical phenomenon, distinct from sprites, observed above thunderstorms using low light television systems. As their name implies, blue jets are optical ejections from the top of the electrically active core regions of thunderstorms. Following their emergence from the top of the thundercloud, they typically propagate upward in narrow cones of about 15 degrees full width at vertical speeds of roughly 100 km/s (Mach 300), fanning out and disappearing at heights of about 40-50 km. Their intensities are on the order of 800 kR near the base, decreasing to about 10 kR near the upper terminus. These correspond to an estimated optical energy of about 4 kJ, a total energy of about 30 MJ, and an energy density on the order of a few mJ/m^3. Blue jets are not aligned with the local magnetic field. Source: elf.gi.alaska.edu http://www.liveleak.com/view?i=39e_1215417528 Shanay Blue Jets Lightning Blue,jets,lightning,weather,high,altitude,plasma,storm Mon, 07 Jul 2008 03:43:49 -0400 http://www.liveleak.com/view?i=250_1215416629 Shanay How to Look for Sprites and Jets "A clear view above a thunderstorm is required. This generally means the thunderstorm activity must be on the horizon. Additionally, there must be very little intervening cloud cover. Best viewing distance from storm is 100-200 miles (200-300 km). At these distances sprites will subtend a vertical angular distance of 10-20 degrees. This is 2-4 times the separation of the pointer stars in the Big Dipper. For observing sprites, it must be completely dark. (i. e. no longer twilight) Eyes must be completely dark adapted. Use same criteria for this as for astronomical observing. If you can see the Milky Way, then it is probably dark enough and the eyes have adapted enough to see sprites. Fix your gaze on the space above an active thunderstorm. Do not be distracted by underlying lightning activity in the storm. Block out the lightning if necessary using a piece of dark paper in such a way as to still being able to view what is going on above the cloud. Sprites will be very brief flashes just on the edge of perceptability. They occur too quickly to follow with the eyes, but their strange vertically striated structure and dull red color may be perceived. Patience will be rewarded. If the right kind of storm is present and one's viewing geometry is favorable, then there is a greater likelihood of seeing a sprite than of seeing a shooting star or comet." Source: elf.gi.alaska.edu http://www.liveleak.com/view?i=250_1215416629 Shanay Red Sprites Red,sprite,lightning,high,altitude,weather,clouds,storm,plasma,high,speed Mon, 07 Jul 2008 03:39:12 -0400 http://www.liveleak.com/view?i=fd7_1215416352 Shanay Characteristics of Red Sprites "Sprites are massive but weak luminous flashes that appear directly above an active thunderstorm system and are coincident with cloud-to-ground or intracloud lightning strokes. Their spatial structures range from small single or multiple vertically elongated spots, to spots with faint extrusions above and below, to bright groupings which extend from the cloud tops to altitudes up to about 95 km. Sprites are predominantly red. The brightest region lies in the altitude range 65-75 km, above which there is often a faint red glow or wispy structure that extends to about 90 km. Below the bright red region, blue tendril-like filamentary structures often extend downward to as low as 40 km. Sprites rarely appear singly, usually occurring in clusters of two, three or more. Some of the very large events, such as shown in Figure 1, seem to be tightly packed clusters of many individual sprites. Other events are more loosely packed and may extend across horizontal distances of 50 km or more and occupy atmospheric volumes in excess of 10,000 cubic km. High speed photometer measurements show that the duration of sprites is only a few ms. Current evidence strongly suggests that sprites preferentially occur in decaying portions of thunderstorms and are correlated with large positive cloud-to-ground lightning strokes. The optical intensity of sprite clusters, estimated by comparison with tabulated stellar intensities, is comparable to a moderately bright auroral arc. The optical energy is roughly 10-50 kJ per event, with a corresponding optical power of 5-25 MW. Assuming that optical energy constitutes 1/1000 of the total for the event, the energy and power are on the order of 10-100 MJ and 5-50 GW, respectively. If sprites are only barely detectable by the unaided human eye, in intensified television images obtained from the ground and from aircraft they appear as dazzlingly complex structures that assume a variety of forms." Source: elf.gi.alaska.edu http://www.liveleak.com/view?i=fd7_1215416352 Shanay Red Sprites stream Red,sprite,lightning,weather, Thu, 20 Mar 2008 16:50:38 -0400 http://www.liveleak.com/view?i=8ab_1206046238 Shanay The Versailles wedding hall (Hebrew: located in Talpiot, Jerusalem, is the site of the worst civil disaster in Israel's history. At 22:43 on Thursday night, May 24, 2001 during the wedding of Keren and Asaf Dror, a large portion of the third floor of the http://www.liveleak.com/view?i=8ab_1206046238 Shanay Versailles wedding hall collapse Versailles, wedding, hall, collapse, Jerusalem, disaster, fall, tragedy