Feed aggregator | Отдел физики околоземного космического пространства

Investigation of the space weathering rate of the geostationary satellites’ surface materials using BVRI photometry

Recent articles in Advances in Space Research - Mon, 03/10/2025 - 19:10

Publication date: Available online 26 February 2025

Source: Advances in Space Research

Author(s): Matej Zigo, Jiří Šilha, Katarína Sabolová, Tomáš Hrobár

The utility of Radiative Transfer Models (RTM) on remotely sensed data in retrieving biophysical and biochemical properties of terrestrial biomes: A Systematic Review

Recent articles in Advances in Space Research - Mon, 03/10/2025 - 19:10

Publication date: Available online 26 February 2025

Source: Advances in Space Research

Author(s): Bongokuhle S’phesihle Sibiya, John Odindi, Onisimo Mutanga, Moses Azong Cho, Cecilia Masemola

Measurements collected with underwater gliders help researchers understand deep water circulation in Gulf of Mexico

Phys.org: Earth science - Mon, 03/10/2025 - 18:00

Ventilation is an important process within the global ocean, where waters sink to deeper layers, are transported by deep currents, and eventually get upwelled back to the surface. This process affects the distribution of oxygen and carbon in the global ocean by transporting these elements from the surface to deeper regions of the ocean.

Boundaries of drainage basins shifted faster during past episodes of climate change, geologists suggest

Phys.org: Earth science - Mon, 03/10/2025 - 16:54

Using a unique field site in the Negev, Ben-Gurion University of the Negev geologists have presented the first-ever time-dependent record of drainage divide migration rates. Prof. Liran Goren, her student Elhanan Harel, and co-authors from the University of Pittsburgh and the Geological Survey of Israel, further demonstrate that episodes of rapid divide migration coincide with past climate changes in the Negev over the last 230,000 years (unrelated to present-day climate change).

How ocean giants are born: Tracking the long-distance impact and danger of extreme swells

Phys.org: Earth science - Mon, 03/10/2025 - 16:30

Late last year, a massive ocean swell caused by a low pressure system in the North Pacific generated waves up to 20 meters high, and damaged coastlines and property thousands of kilometers from its source.

Earth's orbital rhythms link timing of giant eruptions and climate change

Phys.org: Earth science - Mon, 03/10/2025 - 14:51

An international team of scientists has synchronized key climate records from the Atlantic and Pacific Oceans to unravel the sequence of events during the last million years before the extinction of the dinosaurs at the Cretaceous/Paleogene boundary. For the first time, these new high-resolution geochemical records reveal when and how two major eruption phases of gigantic flood basalt volcanism had an impact on climate and biota in the late Maastrichtian era 66 to 67 million years ago.

Volcanic activity billions of years ago set the stage for Earth's oxygen-rich atmosphere, research suggests

Phys.org: Earth science - Mon, 03/10/2025 - 14:15

It is widely believed that Earth's atmosphere has been rich in oxygen for about 2.5 billion years due to a relatively rapid increase in microorganisms capable of performing photosynthesis. Researchers, including those from the University of Tokyo, provide a mechanism to explain precursor oxygenation events, or "whiffs," which may have opened the door for this to occur.

Direct laser acceleration of Bethe-Heitler positrons in laser-channel interactions

Physical Review E (Plasma physics) - Mon, 03/10/2025 - 10:00

Author(s): Bertrand Martinez, Robert Babjak, and Marija Vranic

Positron creation and acceleration is one of the major challenges for constructing future lepton colliders. On the one hand, conventional technology can provide a solution, but at a prohibitive cost and scale. On the other hand, alternative, reduced-scale ideas for positron beam generation could bri…

[Phys. Rev. E 111, 035203] Published Mon Mar 10, 2025

Earth's oldest impact crater was just found in Australia—exactly where geologists hoped it would be

Phys.org: Earth science - Sat, 03/08/2025 - 20:50

We have discovered the oldest meteorite impact crater on Earth, in the very heart of the Pilbara region of Western Australia. The crater formed more than 3.5 billion years ago, making it the oldest known by more than a billion years. Our discovery is published today in Nature Communications.