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Breakthrough in understanding rare lightning-triggered gamma-rays



Posted: 17 May 2018 07:22 AM PDT


The Telescope Array detected 10 bursts of downward terrestrial gamma-ray flashes (TGFs) between 2014 and 2016, more events than have been observed in rest of the world combined. They are the first to detect downward TGFs at the beginning of cloud-to-ground lightning, and to show where they originated inside thunderstorms. The array is by far the only facility capable of documenting the full TGF 'footprint' on the ground.


The ultrafast dance of liquid water



Posted: 17 May 2018 07:22 AM PDT


Typically we consider that water molecules in the liquid state move randomly on ultrafast timescales due to thermal fluctuations. Now, scientists have discovered correlated motion in water dynamics on a sub-100 femtoseconds timescale. This appears as 'caging effects' due to buildup of tetrahedral structures upon supercooling. The results are based on a combination of experimental studies using x-ray lasers and theoretical simulations.
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