Autor Wątek: Magellan - radarowa misja do Wenus  (Przeczytany 606 razy)

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Offline ekoplaneta

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Magellan - radarowa misja do Wenus
« dnia: Luty 26, 2023, 00:09 »
Specyficzne dla Wenus koliste twory na powierzchni planety zwane koronami mogą być odpowiedzialne za odprowadzanie ciepła z wnętrza planety:

The study looks at the mystery using observations the Magellan spacecraft made in the early 1990s of quasi-circular geological features on Venus called coronae. Making new measurements of coronae visible in the Magellan images, the researchers concluded that coronae tend to be located where the planet’s lithosphere is at its thinnest and most active.

Just as a thin bedsheet releases more body heat than a thick comforter, a thin lithosphere allows more heat to escape from the planet’s interior via buoyant plumes of molten rock rising to the outer layer. Typically, where there’s enhanced heat flow, there’s increased volcanic activity below the surface. So coronae likely reveal locations where active geology is shaping Venus’ surface today.

The researchers focused on 65 previously unstudied coronae that are up to a few hundred miles across. To calculate the thickness of the lithosphere surrounding them, they measured the depth of the trenches and ridges around each corona. What they found is that ridges are spaced more closely together in areas where the lithosphere is more flexible, or elastic. By applying a computer model of how an elastic lithosphere bends, they determined that, on average, the lithosphere around each corona is about 7 miles (11 kilometers) thick – much thinner than previous studies suggest. These regions have an estimated heat flow that is greater than Earth’s average, suggesting that coronae are geologically active.

Quetzalpetlatl Corona widziana przez sondę Magellan w promieniach radarowych

Online Orionid

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Odp: Magellan - radarowa misja do Wenus
« Odpowiedź #1 dnia: Marzec 16, 2023, 10:16 »
Jeszcze o danych z misji potwierdzających aktywny wulkanizm Wenus

Scientists spot possible signs of active volcanism on Venus
Mar 15, 2023

Scientists have, for the first time, discovered possible signs of active volcanism on Venus.

The findings confirm long-held suspicions that the planet, which is 80% covered in volcanic rock and the scars of past volcanic eruptions, is still active today.

The evidence comes from data collected by NASA’s Magellan spacecraft, which orbited Venus from 1990 to 1994. In two grainy 1991 radar images captured eight months apart, a volcanic vent morphs from a circular depression into a larger, kidney-bean shape, which researchers interpret as indicating volcanic activity at work. (...)
The geological changes Herrick found occurred in Atla Regio, a vast highland region near Venus’ equator that hosts two of the planet’s largest volcanoes, Ozza Mons and Maat Mons. The region has long been thought to be volcanically active, but there was no direct evidence of recent activity. While scrutinizing Magellan radar images, Herrick identified a volcanic vent associated with Maat Mons that changed significantly between February and October 1991.

E 31.03.23
« Ostatnia zmiana: Marzec 31, 2023, 10:56 wysłana przez Orionid »

Offline kanarkusmaximus

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Odp: Magellan - radarowa misja do Wenus
« Odpowiedź #2 dnia: Marzec 16, 2023, 11:04 »
Pięknie! To jest naprawdę ważne! :)

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Odp: Magellan - radarowa misja do Wenus
« Odpowiedź #2 dnia: Marzec 16, 2023, 11:04 »