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- Tawhaki_Vallis abstract "Tawhaki Vallis is a shallow valley on Jupiter's moon Io. It is located on Io's leading hemisphere in the equatorial plains of western Media Regio at 0.5°N 72.8°W / 0.5; -72.8. The valley is 190 kilometers long, 0.5 to 6 km wide, and 40 to 65 meters deep. Due to the shallow depth and lack of brightness or color variations associated with it, Tawhaki Vallis was seen in only a single, high spatial resolution observation taken by Galileo during an Io encounter on November 26, 1999. The northern and southern ends of the valley are cutoff by the northern margin of the observation and the dusk terminator, so Tawhaki could be longer than the measured length. The valley was formally named Tawhaki Vallis by the International Astronomical Union in 2006 after the nearby volcano, Tawhaki Patera, and the Māori lightning god, Tāwhaki.Analysis of the topography of Tawhaki Vallis shows that it is likely a lava channel, eroded into the Media Regio plain by thermal erosion. The channel is braided, with high-standing islands in the middle of the channel. Changes in channel width are likely due to differences in the topography or substrate properties of the plains. Because the floor of the channel is lower than the surrounding plains, lava that once flowed through the channel carved it through thermal erosion, rather than constructed from cooled lava. The theory that Tawhaki Vallis is a lava channel rather than a flow is also supported by the lack of levees on either side of the channel. This would require the lava that flowed through to be insulated from radiative and conductive cooling along the 200-km long channel. However, the flat floor of the channel and the lack of pit crater chains nearby would also preclude the possibility that Tawhaki Vallis is a collapsed lava tube, like Hadley Rille on the Moon. Depending on the composition of the lava and the substrate, Tawhaki Vallis may have formed over a period of 400–600 days (for ultramafic lava flowing over ultramafic plains), 10–60 days (for sulfur lava flow over sulfur plains), or hours to a few days when a high-temperature lava flows over a substrate with a much cooler melting point, such as ultramafic lava over plains composed primarily of sulfur. Considering the need to keep the lava liquid enough to flow over these long distances and typical duration of eruptions that could carve a channel like this, the latter possibility (high-temperature lava over a surface with a cooler melting temperature) is considered the most likely.Similar channels to Tawhaki Vallis have also been observed near Zamama and Emakong Patera. Those channels are clearly associated with their respective volcano, but based on the images available, it is not known if an eruption at Tawhaki Patera was responsible for the formation of Tawhaki Vallis.".
- Tawhaki_Vallis thumbnail Tawhaki_Vallis.png?width=300.
- Tawhaki_Vallis wikiPageID "26024773".
- Tawhaki_Vallis wikiPageLength "4426".
- Tawhaki_Vallis wikiPageOutDegree "28".
- Tawhaki_Vallis wikiPageRevisionID "659984628".
- Tawhaki_Vallis wikiPageWikiLink Braided_river.
- Tawhaki_Vallis wikiPageWikiLink Category:Lava_channels.
- Tawhaki_Vallis wikiPageWikiLink Category:Surface_features_of_Io_(moon).
- Tawhaki_Vallis wikiPageWikiLink Emakong_Patera.
- Tawhaki_Vallis wikiPageWikiLink Erosion.
- Tawhaki_Vallis wikiPageWikiLink International_Astronomical_Union.
- Tawhaki_Vallis wikiPageWikiLink Io_(moon).
- Tawhaki_Vallis wikiPageWikiLink Jupiter.
- Tawhaki_Vallis wikiPageWikiLink Kilometre.
- Tawhaki_Vallis wikiPageWikiLink Lava.
- Tawhaki_Vallis wikiPageWikiLink Lava_channel.
- Tawhaki_Vallis wikiPageWikiLink Lava_tube.
- Tawhaki_Vallis wikiPageWikiLink Media_Regio.
- Tawhaki_Vallis wikiPageWikiLink Metre.
- Tawhaki_Vallis wikiPageWikiLink Mons_Hadley.
- Tawhaki_Vallis wikiPageWikiLink Moon.
- Tawhaki_Vallis wikiPageWikiLink Māori_mythology.
- Tawhaki_Vallis wikiPageWikiLink Natural_satellite.
- Tawhaki_Vallis wikiPageWikiLink Planetary_nomenclature.
- Tawhaki_Vallis wikiPageWikiLink Radiative_cooling.
- Tawhaki_Vallis wikiPageWikiLink Sulfur.
- Tawhaki_Vallis wikiPageWikiLink Tawhaki_Patera.
- Tawhaki_Vallis wikiPageWikiLink Terminator_(solar).
- Tawhaki_Vallis wikiPageWikiLink Thermal_conduction.
- Tawhaki_Vallis wikiPageWikiLink Tāwhaki.
- Tawhaki_Vallis wikiPageWikiLink Ultramafic_rock.
- Tawhaki_Vallis wikiPageWikiLink Zamama_(volcano).
- Tawhaki_Vallis wikiPageWikiLink File:Tawhaki_Vallis.png.
- Tawhaki_Vallis wikiPageWikiLinkText "Tawhaki Vallis".
- Tawhaki_Vallis wikiPageUsesTemplate Template:Coord.
- Tawhaki_Vallis wikiPageUsesTemplate Template:Io.
- Tawhaki_Vallis wikiPageUsesTemplate Template:Reflist.
- Tawhaki_Vallis subject Category:Lava_channels.
- Tawhaki_Vallis subject Category:Surface_features_of_Io_(moon).
- Tawhaki_Vallis hypernym Valley.
- Tawhaki_Vallis point "0.5 -72.8".
- Tawhaki_Vallis type Place.
- Tawhaki_Vallis type Channel.
- Tawhaki_Vallis type Feature.
- Tawhaki_Vallis type Landform.
- Tawhaki_Vallis type SpatialThing.
- Tawhaki_Vallis comment "Tawhaki Vallis is a shallow valley on Jupiter's moon Io. It is located on Io's leading hemisphere in the equatorial plains of western Media Regio at 0.5°N 72.8°W / 0.5; -72.8. The valley is 190 kilometers long, 0.5 to 6 km wide, and 40 to 65 meters deep. Due to the shallow depth and lack of brightness or color variations associated with it, Tawhaki Vallis was seen in only a single, high spatial resolution observation taken by Galileo during an Io encounter on November 26, 1999.".
- Tawhaki_Vallis label "Tawhaki Vallis".
- Tawhaki_Vallis sameAs Q3391982.
- Tawhaki_Vallis sameAs Tawhaki_Vallis.
- Tawhaki_Vallis sameAs Tawhaki_Vallis.
- Tawhaki_Vallis sameAs m.0b6h178.
- Tawhaki_Vallis sameAs Q3391982.
- Tawhaki_Vallis lat "0.5".
- Tawhaki_Vallis long "-72.8".
- Tawhaki_Vallis wasDerivedFrom Tawhaki_Vallis?oldid=659984628.
- Tawhaki_Vallis depiction Tawhaki_Vallis.png.
- Tawhaki_Vallis isPrimaryTopicOf Tawhaki_Vallis.