Piú votate - Venus |
![Nome del file=South_Polar_Regions-VI0310_00_5_H-PCF-LXTT.jpg
Dimensione del file=13KiB
Dimensioni=488x512
Aggiunta il=Ago 10, 2009 South_Polar_Regions-VI0310_00_5_H-PCF-LXTT.jpg](albums/userpics/10060/small_South_Polar_Regions-VI0310_00_5_H-PCF-LXTT.jpg)
South_Polar_Regions-VI0310_00_5_H-PCF-LXTT.jpgVenus' South Polar Vortex (Absolute Natural Colors; credits for the additional process. and color.: Dr P>aolo C. Fienga - Lunexit Team)54 visiteCaption ESA:"This image, of the ‘Eye of the Hurricane’ on Venus was taken by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on board Venus Express.
This picture shows a Region in the Venusian Atmosphere about 60 Km from the Surface, at a wavelength of about 5 micrometres. In this figure, the dipole assumes an eye-like shape and from here until the last image, it is possible to see how its shape evolves rapidly in a span of only 24 hours.
The yellow dot in the image indicates the location of the South Pole".MareKromium![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (5 voti)
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![Nome del file=Venusian_Surface-Venera_13-08.jpg
Dimensione del file=213KiB
Dimensioni=938x194
Aggiunta il=Mar 08, 2009 Venusian_Surface-Venera_13-08.jpg](albums/userpics/10060/small_Venusian_Surface-Venera_13-08.jpg)
Venusian_Surface-Venera_13-08.jpgVenus, from Venera 13 (Natural Colors; credits: Ted Stryk)66 visiteTed Stryk comments:"...Here is the other Venera 13 pan. The color data is OK on the sides, but in the center, all color data is nearly blank, making any color variations dubious in that part of the image...".
MareKromium![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (5 voti)
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![Nome del file=Venus-South_Polar_Vortex-12_VIRTIS_vortex_movie_H.gif
Dimensione del file=3628KiB
Dimensioni=900x750
Aggiunta il=Feb 26, 2008 Venus-South_Polar_Vortex-12_VIRTIS_vortex_movie_H.gif](albums/userpics/10060/small_Venus-South_Polar_Vortex-12_VIRTIS_vortex_movie_H.gif)
Venus-South_Polar_Vortex-12_VIRTIS_vortex_movie_H.gifThe restless South Pole of Venus (GIF-Movie - credits: ESA)70 visiteCaption ESA:"This video is composed of a set of images acquired by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on board ESA’s Venus Express, during two observations slots in August 2007. The spacecraft was flying at a distance of about 65.000 Km from the Planet.
The video was obtained at 3.8-micrometre wavelength, allowing the instrument to see the cloud top thermal emission at an altitude of about 60-65 km.
The South Polar "Dipole", a complex atmospheric vortex-like feature situated over the South Pole of the Planet, can be clearly seen.
The change of the Polar Vortex shape in a time scale of a few hours is remarkably noticeable here"MareKromium![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (5 voti)
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![Nome del file=Venus-PIA10124.jpg
Dimensione del file=108KiB
Dimensioni=1700x1700
Aggiunta il=Dic 18, 2007 Venus-PIA10124.jpg](albums/userpics/10060/small_Venus-PIA10124.jpg)
Venus-PIA10124.jpgVenus (natural colors; credits: NASA)54 visiteCaption NASA:"The Planet Venus is enshrouded by a global layer of clouds that obscures its surface to the MESSENGER Dual Imaging System (MDIS) cameras.
This single frame is part of a color sequence taken to help the MESSENGER team calibrate the camera in preparation for the spacecraft's first flyby of Mercury on January 14, 2008. Over the next several months the camera team will pore over the 614 images taken during this Venus encounter to ascertain color sensitivity and other optical properties of the instrument. These tasks address two key goals for the camera at Mercury: understanding surface color variations and their relation to compositional variations in the crust, and ensuring accurate cartographic placement of features on Mercury's surface.
Preliminary analysis of the Venus flyby images indicates that the cameras are healthy and will be ready for next January's close encounter with Mercury".MareKromium![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (5 voti)
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![Nome del file=Venusian_Atmosphere-ORB410_411_tot_H1.jpg
Dimensione del file=836KiB
Dimensioni=2700x1500
Aggiunta il=Ago 18, 2007 Venusian_Atmosphere-ORB410_411_tot_H1.jpg](albums/userpics/10060/small_Venusian_Atmosphere-ORB410_411_tot_H1.jpg)
Venusian_Atmosphere-ORB410_411_tot_H1.jpgThe Venusian Atmosphere under the Messenger53 visiteCaption ESA:"The images in this panel were obtained by the VIRTIS imaging spectrometer on board Venus Express on 5 and 6 June 2007, before and after MESSENGER’s closest approach to the Planet. These panels from VIRTIS provide a night-side view of the same Region that Messenger flew over and imaged.
The images where obtained at 1,7 micrometres, revealing atmospheric details down to an altitude of 50 Km from the surface".MareKromium![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (5 voti)
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![Nome del file=Venusian_Atmosphere-Airglow_VIRTIS_Anticlockwise-02.jpg
Dimensione del file=38KiB
Dimensioni=1000x510
Aggiunta il=Apr 20, 2007 Venusian_Atmosphere-Airglow_VIRTIS_Anticlockwise-02.jpg](albums/userpics/10060/small_Venusian_Atmosphere-Airglow_VIRTIS_Anticlockwise-02.jpg)
Venusian_Atmosphere-Airglow_VIRTIS_Anticlockwise-02.jpgThe "Glowing Oxygen" of Venus (false colors - elab. ESA)53 visite“During one year of observations, we have already collected huge amount of data, which is exactly what we need to decode the secrets of an atmosphere as complex as that of Venus,” said Håkan Svedhem, Venus Express Project Scientist at ESA. “Analysing it is an extreme effort for all science teams, but it is definitively paying back in terms of results.”
The first ever, terrific global views of the double-eyed vortex at Venus’ south pole, the first sets of 3D data about the structure and the dynamics of the sulphuric-acid clouds surrounding the planet in a thick curtain, temperature maps of the surface and the atmosphere at different altitudes, are only a few of the results obtained so far.
“Continuing at today’s rate, and on the basis of what we were able to see so far, there is no doubt that Venus Express will eventually allow a better global understanding of this planet,” continued Svedhem. “Not only will planetary science in general benefit from this, but also understanding Venus – its climate and atmospheric dynamics –will provide a better comprehension of the mechanisms that drive long-term climate evolution on our own Earth.”
MareKromium![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (5 voti)
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![Nome del file=9-Venus.gif
Dimensione del file=2019KiB
Dimensioni=512x512
Aggiunta il=Nov 12, 2006 9-Venus.gif](albums/userpics/10060/small_9-Venus.gif)
9-Venus.gifApproaching Venus (GIF anim.)54 visiteOn 20 April 2006, after its first 9-day, elongated orbit around Venus, ESA’s Venus Express started to get closer to the Planet, until it reached its final 24-hour long orbit on 7 May. During this time, and up to today, the spacecraft has been working relentlessly: the new data coming in are already providing first glimpses on planetary features never seen before.
If taking the first ever clear images of the double-eye vortex at Venus’ south pole - imaged by Venus Express during its very first orbit - was already a first in the history of planetary exploration and a very pleasant surprise for the scientists, nobody could expect that the vortex had a structure even more complicated than possibly foreseen.
Infrared images taken by the Ultraviolet/Visible/Near-Infrared spectrometer (VIRTIS) on board the spacecraft not only provided the first clear view of the vortex, but also gave a much closer insight into it when Venus Express flew over the South Pole at the end of May this year (2006). MareKromium![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (5 voti)
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![Nome del file=Venusian_Clouds_and_winds_in_the_infrared_H.jpg
Dimensione del file=126KiB
Dimensioni=1877x825
Aggiunta il=Lug 16, 2006 Venusian_Clouds_and_winds_in_the_infrared_H.jpg](albums/userpics/10008/small_Venusian_Clouds_and_winds_in_the_infrared_H.jpg)
Venusian_Clouds_and_winds_in_the_infrared_H.jpgVenusian cloud structures - Night view (2)56 visiteOriginal ESA caption:""We are also collecting the first information on the minor chemical components of the atmosphere, such as CO - Carbon Monoxide" added Pierre Drossart.
"With VIRTIS we can see in the atmosphere of the southern hemisphere deeper than any other previous mission, and we started gathering data on the yet unknown chemistry of the lower atmospheric layers, to build a global picture. Studying the variation of minor chemical compounds over different latitudes and depths is also a very useful tracer for the atmospheric global motion".![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (5 voti)
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![Nome del file=South_Polar_Vortex-02.jpg
Dimensione del file=136KiB
Dimensioni=1213x1061
Aggiunta il=Lug 16, 2006 South_Polar_Vortex-02.jpg](albums/userpics/10008/small_South_Polar_Vortex-02.jpg)
South_Polar_Vortex-02.jpgVenusian South Polar Vortex (3)53 visiteOriginal ESA caption:"The reason why the morphology of the vortex varies so extensively along a 'vertical' line is still unexplained.
"This is why we are organizing a campaign to observe the South Polar Vortex, fully dedicated to solve this unexpected puzzle", said Giuseppe Piccioni, VIRTIS co-Principal Investigator.
"First we want to understand how the structure is organized - actually, with VIRTIS we are building a true 3D view of the vortex. Then we hope to be able to better understand what are the driving forces that shape it".![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (5 voti)
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![Nome del file=Craters-Unnamed_Craters_in_Lavinia_Planitia-PIA00103.jpg
Dimensione del file=53KiB
Dimensioni=645x516
Aggiunta il=Mar 29, 2005 Craters-Unnamed_Craters_in_Lavinia_Planitia-PIA00103.jpg](albums/userpics/10008/small_Craters-Unnamed_Craters_in_Lavinia_Planitia-PIA00103.jpg)
Craters-Unnamed_Craters_in_Lavinia_Planitia-PIA00103.jpg3D view of impact craters in Lavinia Planitia (simulated colors)85 visiteCaption NASA originale:"Three impact craters are displayed in this 3D perspective view of the surface of Venus. The center of the image is located at approx. 27° South latitude, 339° East longitude in the NWestern portion of Lavinia Planitia. The viewpoint is located SW of Howe Crater, which appears centered in the lower portion of the image. Howe is a crater with a diameter of 37,3 Km. Danilova, a crater with a diameter of 47,6 Km, appears above and to the left of Howe in the image. Aglaonice, a crater with a diameter of 62,7 Km, is shown to the right of Danilova.Magellan synthetic aperture radar data is combined with radar altimetry to develop a three-dimensional map of the surface. Rays cast in a computer intersect the surface to create a three-dimensional perspective view. Simulated color and a digital elevation map developed by the U.S. Geological Survey are used to enhance small-scale structure. The simulated hues are based on color images recorded by the Soviet Venera 13 and 14 spacecraft".![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (5 voti)
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![Nome del file=Volcanoes-Idunn_Mons-PIA13001-2.jpg
Dimensione del file=181KiB
Dimensioni=1920x1080
Aggiunta il=Apr 09, 2010 Volcanoes-Idunn_Mons-PIA13001-2.jpg](albums/userpics/10060/small_Volcanoes-Idunn_Mons-PIA13001-2.jpg)
Volcanoes-Idunn_Mons-PIA13001-2.jpgIdunn Mons (Perspective View and False Colors; credits: NASA/JPL-Caltech/ESA)54 visiteCaption NASA:"This figure shows the Volcanic Peak Idunn Mons (at about 46° South Lat. and 214,5° East Long.) in the Imdr Regio area of Venus. The topographic backbone derives from data obtained by NASA's Magellan spacecraft, with a vertical exaggeration of 30 times.
Radar data (in brown) from Magellan has been draped on top of the topographic data. Bright areas are rough or have steep slopes. Dark areas are smooth.
The warmest area of Idunn is centered on the Summit, which stands about 2,5 Km (approx. 1,6 miles) above the Datum, and the bright Lava Flows that originate there. Idunn Mons has a diameter of about 200 Km (approx. 120 miles).
The spectrometer data was collected from May 2006 to the end of 2007. A movie featuring 360-degree views of the volcano is based on the same data and can be viewed at JPL's Multimedia".MareKromium![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (4 voti)
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![Nome del file=Volcanoes-Maat_Mons-PIA00487.jpg
Dimensione del file=663KiB
Dimensioni=1997x1800
Aggiunta il=Gen 30, 2010 Volcanoes-Maat_Mons-PIA00487.jpg](albums/userpics/10060/small_Volcanoes-Maat_Mons-PIA00487.jpg)
Volcanoes-Maat_Mons-PIA00487.jpgVolcanic Domes on the Flank of Maat Mons - East Ovda Region (possible Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)54 visiteThis Magellan image is centered at about 3,2° North Latitude and 194,9° East Longitude, in the Eastern Ovda Region of Venus.
The image, which is approx. 90 Km (about 56 miles) in width and approx. 80 Km (such as about 50 miles) in length, shows some small Volcanic Domes on the Flank of the volcano Maat Mons. The bright flows to the East are most likely rough Lava Flows while the darker flows to the West are probably smoother flows. The dark flows do show some roughness, however, as can be seen by the structure in the flows to the South/West.
These dark flows also have some debris that has been deposited on top of them. The debris may be fine material from the surrounding Plains on top of the flow by wind or it may be ash from the volcano.
Small Volcanic Domes are very common features on the Surface of Venus, indicating that there has been (and maybe there still is) much volcanic activity going on almost everywhere.
Assuming that the central Volcanic Cone is symmetrical in shape and knowing the length of the cone's side and the incidence angle, radar foreshortening yields a height and slope of 688 meters and 8,2°, respectively, for the Cone.
These values are similar to heights and slopes of some Volcanic Cones on the Earth. MareKromium![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) ![5](themes/hardwired/images/rate_full.png) (4 voti)
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