magnetic reconnection tagged posts

The World’s Largest Turbulence Simulation Unmasks the Flow of Energy in Astrophysical Plasmas

Solar corona
Halo-like solar corona. (Photo courtesy of NASA.)

Researchers have uncovered a previously hidden heating process that helps explain how the atmosphere that surrounds the Sun called the “solar corona” can be vastly hotter than the solar surface that emits it.

The discovery at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL) could improve tackling a range of astrophysical puzzles such as star formation, the origin of large-scale magnetic fields in the universe, and the ability to predict eruptive space weather events that can disrupt cell phone service and black out power grids on Earth. Understanding the heating process also has implications for fusion research.

First clear 3D explanation

“Our direct numerical simulation is the first to pro...

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Aurora mysteries unlocked with NASA’s THEMIS mission

The photograph was taken east of Saskatoon on winter solstice in 2015 with a 81% illuminated waxing gibbous Moon. It was processed with PixInsight to remove streaks caused due to an accidentally nudged tripod during exposure while attempting to retain realistic star shapes and colors. The exposure time was 2.5 seconds. Credit: Alan Duffy

A special type of aurora, draped east-west across the night sky like a glowing pearl necklace, is helping scientists better understand the science of auroras and their powerful drivers out in space. Known as auroral beads, these lights often show up just before large auroral displays, which are caused by electrical storms in space called substorms...

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A new theory for how Black Holes and Neutron Stars Shine Bright

Here, a massive super-computer simulation shows the strong particle density fluctuations that occur in the extreme turbulent environments that host black holes and neutron stars. Dark blue regions are low particle density regions, while yellow regions are strongly over-dense regions. Particles are accelerated to extremely high speeds due to the interactions with strongly turbulence fluctuations in this environment. Credit: Image from published study

Astrophysicists employed massive super-computer simulations to calculate the mechanisms that accelerate charged particles in extreme environments. They concluded their energization is powered by the interplay of chaotic motion and reconnection of super-strong magnetic fields.

For decades, scientists have speculated about the origin of ...

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Unexpected Rain on Sun Links two Solar Mysteries

Mason’s article analyzed three observations of Raining Null-Point Topologies, or RNTPs, a previously overlooked magnetic structure shown here in two wavelengths of extreme ultraviolet light. The coronal rain observed in these comparatively small magnetic loops suggests that the corona may be heated within a far more restricted region than previously expected.
Credit: NASA’s Solar Dynamics Observatory/Emily Mason

Researchers find rain on the sun in an unexpected place. The findings could create a new link between two of the biggest mysteries in solar physics. For five months in mid 2017, Emily Mason did the same thing every day...

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