WHAT THE F?

*** Aluminum (TMA), Barium, Strontium, Sulfur Hexafluoride (SF6), and Lithium have been dumped in space to study and modify space weather for over sixty years (60) and nobody knew. - Big Wobble Blog *** Then there's Z. July 18, 2022 - I was awakened this morning with a clear message that there are three years left until the simulation ends. - ELLIE *** Ego & Time are our biggest anchors to ignorance- Walter Russell

Search This Blog

Saturday, April 17, 2021

Early Earth

 

Scientists are finding that Earth's mantle may have generated the planet's early magnetic field. Credit: Naeblys


New research lends credence to an unorthodox retelling of the story of early Earth that was first proposed by a geophysicist at the Scripps Institution of Oceanography in La Jolla, California.

In a study appearing in the journal Earth and Planetary Science Letters, researchers Dave Stegman, Leah Ziegler and Nicolas Blanc provide new estimates of the thermodynamics of magnetic field generation in the liquid portion of early Earth's mantle, and show how long that field was available.

The National Science Foundation-funded research provides a "door-opening opportunity" to resolving inconsistencies in the narrative of the planet's early days.

"Currently we have no grand unifying theory for how Earth evolved thermally," Stegman said. "We don't have a conceptual framework for understanding the planet's evolution. This is one viable hypothesis."

The study is one of the latest developments in a paradigm shift that could change how Earth's history is understood.

It has been a bedrock tenet of geophysics that Earth's liquid outer core has always been the source of the dynamo that generates its magnetic field. Magnetic fields form on Earth and other planets that have liquid, metallic cores, rotate rapidly, and experience conditions that make the convection of heat possible.

In 2007, researchers in France proposed a radical departure from the long-held assumption that the Earth's mantle has remained entirely solid since the very beginnings of the planet. They argued that during the first half of the planet's 4.5-billion-year history, the bottom third of Earth's mantle would have been molten, which they call "the basal magma ocean."

Six years later, Stegman and Ziegler expanded on that idea, publishing the first work showing how this once-liquid portion of the lower mantle, rather than the core, could have exceeded the thresholds needed to create Earth's magnetic field during that time. This study is a next step in their work.


The above story is based on materials provided by National Science Foundation.

No comments:

Post a Comment

talk to me

i told you

i told you
to look around (click older posts)

no people in dark green areas

no people in dark green areas

book 2 of 3

book 2 of 3
"I want for you what you want for me... nothing more, nothing less..."

keeping track

on my "to read" list

let's grow hemp

let's grow hemp

Get it?

Get it?

from the new book FINDING THE INVISIBLES

from the new book FINDING THE INVISIBLES
click to read free ebook

Contact Form

Name

Email *

Message *