Browse Journal Highlights
New study ranks hazardous asteroid effects from least to most destructive
Press— If an asteroid struck Earth, which of its effects—scorching heat, flying debris, towering tsunamis—would claim the most lives? A new study has the answer: violent winds and shock waves are the most dangerous effects produced by Earth-impacting asteroids. The study explored seven effects associated.... more
Why can we see and hear meteors at the same time?
Blog— Light travels nearly a million times faster than sound. But for thousands of years, humans have reported hearing some meteors as they pass overhead, puzzling scientists for decades. Now, a new study puts forth a simple explanation for the phenomenon: the sound waves aren’t coming from the meteor.... more
Mercury’s craters offer clues to planet’s contraction
Blog— Mercury’s cratered surface, like the moon, tells a story of bombardment that goes back billions of years. Now scientists have used this history of impacts to determine when and at what rate Mercury cooled down after its formation and shrank to its present size…more more
Arctic river ice deposits rapidly disappearing
Press Release— Climate change is causing thick ice deposits that form along Arctic rivers to melt nearly a month earlier than they did 15 years ago, a new study finds. River icings form when Arctic groundwater reaches the surface and solidifies on top of frozen rivers. They grow throughout the winter.... more
Can tree planting really help mitigate climate change?
From Eos.org: Research Spotlights— It depends on where, when, and how. For centuries, nature enthusiasts around the world have hosted events to plant and care for trees. At the first U.S. Arbor Day, held in 1872, Nebraska residents planted an estimated 1 million trees. In more recent years, some groups.... more
What Happens When Ocean Eddies Hit a Wall?
Editors’ Highlight—Observing subsurface changes of two anticyclonic eddies passing over the Izu-Ogasawara Ridge This study examines how submarine ridges create subsurface changes to ocean eddies. Looking specifically at two anticyclonic eddies in the North Pacific that migrate westward and encounter.... more
Could Stratospheric Ozone Depletion Make Hadley Cells Expand?
From Eos.org: Research Spotlights— Convection-driven Hadley cells are expanding poleward. Scientists now may have uncovered part of the reason why. In 1735, meteorologist George Hadley shook up his field by proposing a novel model of global atmospheric circulation, since named the Hadley cell, in which.... more
Ice fabric in an Antarctic ice stream interpreted from seismic anisotropy
Editors’ Highlight— Large-scale ice flow models assume that ice is isotropic, but this study suggests the presence of highly anisotropic ice within a fast-flowing ice stream in West Antarctica. The authors analyzed the shear wave splitting of events generated on the bed of the ice stream. From the.... more
Lightning could be sending powerful electromagnetic radiation into space
Blog— During a thunderstorm, lightning that hits the ground may be shooting powerful electromagnetic radiation skyward. At least that is the new theory from a physicist in China who specializes in laser-plasma interactions. Hui-Chun Wu, who works at the Institute for Fusion Theory and Simulation (IFTS).... more
Unique, non-Earthlike, meteoritic ion behavior in upper atmosphere of Mars
Press Release— Mars has electrically charged metal atoms (ions) high in its atmosphere, according to new results from NASA’s MAVEN spacecraft. The metal ions can reveal previously invisible activity in the mysterious electrically charged upper atmosphere (ionosphere) of Mars…more more
Eos.org: Earth & Space Science News
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Featured Special Collection
The Magnetospheric Multiscale (MMS) mission has been performing particle and electromagnetic field measurements in the near-Earth environment since its launch in March 2015. Thanks to data with unprecedented time resolution on four identical spacecraft in a close tetrahedron configuration (down to 10 km), MMS science goals are to probe and understand the electron-scale physics involved in the magnetic reconnection process. This collection provides a selection of key results obtained during the first phase of the mission at the dayside magnetopause. It includes new observations of the geometry and variability of the reconnection process, the detailed dynamics of particles, fields and waves in the vicinity of the reconnection region, the observation of small-scale signatures at current sheets formed in the magnetosheath, in Kevlin-Helmholtz vortices, or flux transfer events, as well as other small-scale features which are by-products of magnetic reconnection or not. These results open a new window for our understanding of magnetic reconnection in space, with direct and numerous implications for astrophysical and laboratory plasmas.