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Keyword: geomagneticreversal

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  • Rise of dinosaurs linked to increasing oxygen levels

    08/22/2019 6:45:52 PM PDT · by SunkenCiv · 37 replies
    EurekAlert! ^ | Tuesday, August 20, 2019 | Goldschmidt Conference
    Scientists have found that increasing oxygen levels are linked to the rise of North American dinosaurs around 215 M years ago. A new technique for measuring oxygen levels in ancient rocks shows that oxygen levels in North American rocks leapt by nearly a third in just a couple of million years, possibly setting the scene for a dinosaur expansion into the tropics of North America and elsewhere... The US-based scientists have developed a new technique for releasing tiny amounts of gas trapped inside ancient carbonate minerals. The gases are then channelled directly into a mass spectrometer, which measures their composition....
  • Earth's Core, Magnetic Field Changing Fast, Study Says

    07/10/2008 1:53:24 PM PDT · by hripka · 138 replies · 298+ views
    National Geographic Society ^ | June 30, 2008 | Kimberly Johnson
    Rapid changes in the churning movement of Earth's liquid outer core are weakening the magnetic field in some regions of the planet's surface, a new study says. "What is so surprising is that rapid, almost sudden, changes take place in the Earth's magnetic field," said study co-author Nils Olsen, a geophysicist at the Danish National Space Center in Copenhagen. The findings suggest similarly quick changes are simultaneously occurring in the liquid metal, 1,900 miles (3,000 kilometers) below the surface, he said. The swirling flow of molten iron and nickel around Earth's solid center triggers an electrical current, which generates the...
  • {Simulated] Geomagnetic jerks finally reproduced and explained

    04/22/2019 1:23:36 PM PDT · by BenLurkin · 22 replies
    Phys.org ^ | April 22, 2019
    The Earth's magnetic field experiences unpredictable, rapid, and intense anomalies that are known as geomagnetic jerks. Initially described in 1978, geomagnetic jerks are unpredictable events that abruptly accelerate the evolution of the Earth's magnetic field, and skew predictions of its behaviour on a multi-year scale. The Earth's magnetic field is produced by the circulation of matter within its metallic core, via the energy released when this core cools. Researchers know of two types of movements that cause two types of variations in the magnetic field: those resulting from slow convection movement, which can be measured on the scale of a...
  • People can sense Earth’s magnetic field, brain waves suggest

    03/18/2019 1:26:25 PM PDT · by DUMBGRUNT · 71 replies
    Science News ^ | 18 Mar 2019 | MARIA TEMMING
    During the experiment, 26 participants each sat with their eyes closed in a dark, quiet chamber lined with electrical coils. These coils manipulated the magnetic field inside the chamber such that it remained the same strength as Earth’s natural field but could be pointed in any direction. Participants wore an EEG cap that recorded the electrical activity of their brains while the surrounding magnetic field rotated in various directions. ...Joseph Kirschvink, a neurobiologist and geophysicist at Caltech, and colleagues studied alpha waves to determine whether the brain reacts to changes in magnetic field direction. Alpha waves generally dominate EEG readings...
  • Rediscovering north Local vet’s work on magnetism changed maps, textbooks

    11/13/2017 7:52:58 AM PST · by SandRat · 23 replies
    SierraVista Herald ^ | David Rookhuyzen
    At first blush, Frank Klein is another distinguished veteran in a military town full of them. But the 96-year-old retired U.S. Air Force colonel can also lay claim to a special footnote in history. In addition to being a decorated officer and skilled navigator, he’s the man who helped redefine where north was. The Wauwatosa, Wisconsin, native’s journey to his footnote was a circuitous one. Following high school, he had a mind to go into acting and actually moved to New York City. For a year he had a role on a weekly CBS radio program, where he would rub...
  • Check your compass: The magnetic north pole is on the move

    02/05/2019 11:32:20 AM PST · by Puppage · 55 replies
    AP ^ | 02/05/2019 | AP
    WASHINGTON (AP) - North isn't quite where it used to be. Earth's north magnetic pole has been drifting so fast in the last few decades that scientists say that past estimates are no longer accurate enough for precise navigation. On Monday, they released an update of where magnetic north really was, nearly a year ahead of schedule.
  • Earth’s magnetic pole is on the move, fast. And we don’t know why

    01/12/2019 9:17:53 AM PST · by shove_it · 66 replies
    News Corp Australia Network ^ | 12 Jan 2019 | Jamie Seidel
    Earth’s magnetic field is what allows us to exist. It deflects harmful radiation. It keeps our water and atmosphere in place. But now it’s acting up — and nobody knows why. Planet Earth is alive. Deep beneath its skin, its life blood — rivers of molten iron — pulse around its core. And this mobile iron is what generates the magnetic field that causes auroras — and keeps us alive. But, according to the science journal Nature, something strange is going on deep down below. It’s causing the magnetic North Pole to ‘skitter’ away from Canada, towards Siberia. “The magnetic...
  • Shifting North Magnetic Pole Forces Unprecedented Navigation Fix

    01/11/2019 9:23:46 PM PST · by artichokegrower · 99 replies
    gCaptain ^ | January 11, 2019 | Alister Doyle
    Rapid shifts in the Earth’s north magnetic pole are forcing researchers to make an unprecedented early update to a model that helps navigation by ships, planes and submarines in the Arctic, scientists said.
  • Earth’s magnetic field is acting up and geologists don’t know why

    01/10/2019 7:52:13 PM PST · by BenLurkin · 126 replies
    Nature ^ | 09 January 2019 | Alexandra Witze
    The magnetic pole is moving so quickly that it has forced the world’s geomagnetism experts into a rare move. On 15 January, they are set to update the World Magnetic Model, which describes the planet’s magnetic field and underlies all modern navigation, from the systems that steer ships at sea to Google Maps on smartphones. The most recent version of the model came out in 2015 and was supposed to last until 2020 — but the magnetic field is changing so rapidly that researchers have to fix the model now. The problem lies partly with the moving pole and partly...
  • Earth’s Magnetic Field Decaying at an Alarming Rate

    12/11/2018 11:21:44 AM PST · by fishtank · 151 replies
    Creation Evolution Headlines ^ | 12-11-18 | David F. Coppedge
    Earth’s Magnetic Field Decaying at an Alarming Rate December 11, 2018 | David F. Coppedge The biosphere depends on earth’s magnetic field, but it has been decaying rapidly for at least 1500 years. In Spacecraft Earth: A Guide for Passengers, Dr Henry Richter describes how the story of the decay of the earth’s magnetic field caught his attention. He had read the monograph by Dr Thomas Barnes in the 1970s, and realized the implications: if the decay is true, the earth could not be billions of years old. He considered the various proposals for maintaining the field, but none of...
  • Researchers find fast flip in Earth’s magnetic field

    08/23/2018 12:39:17 PM PDT · by BenLurkin · 22 replies
    earthsky.org ^ | | August 22, 2018 | Deborah Byrd
    A research team led by scientists in Taiwan and [Red] China announced on August 21, 2018, that Earth’s protective magnetic field has undergone relatively rapid shifts in the past, including one lasting just two centuries. That’s fast in contrast to the thousands of years thought to be needed for a magnetic pole reversal, an event whereby magnetic south becomes magnetic north and vice versa. Such an event might leave Earth with a substantially reduced magnetic field for some unknown period of time, exposing our world to dangerous effects from the sun. If it occurred in today’s world of ubiquitous electric...
  • "Earth's Magnetic Field not flipping tonight, perhaps.." John Batchelor Show

    05/02/2018 6:45:59 AM PDT · by Voption · 4 replies
    The John Batchelor Show WABC- NY ^ | May 2, 2018 | John Batchelor/Robert Zimmerman
    Blue Origin test flight, China's space-program, SLS, earth's magnetic field flipping?
  • Why Earth's Magnetic Field Might Not Flip After All

    05/01/2018 8:06:25 AM PDT · by BenLurkin · 55 replies
    Live Science ^ | April 30, 2018 03:35pm ET | Stephanie Pappas,
    In a study published in the journal Proceedings of the National Academy of Sciences today (April 30), researchers ... found that today's patterns don't resemble the two most extreme disruptions in the past 50,000 years, when the magnetic field nearly reversed. [7 Ways the Earth Changes in the Blink of an Eye] Instead, the modern field appears similar to the field during two other periods — one 49,000 ago, and one 46,000 years ago — when the field wobbled but didn't flip-flop. ... Currently, magnetic north is very close to the North Pole, while magnetic south is near the South...
  • Earth’s Second Magnetic Field: Satellite Image Reveals Invisible Force From Ocean Currents

    04/12/2018 6:58:36 AM PDT · by DUMBGRUNT · 64 replies
    Inquisitr ^ | 12 Apr 2018 | Mia Lorenzo
    The Earth has a second magnetic field, one generated by ocean currents. Researchers know little about it, but images captured by satellites show this invisible force generated by the world’s salty oceans in perfect detail. ... ESA released a video detailing the changes in the Earth’s magnetic field over a 24-hour period... ...“It’s a really tiny magnetic field. It’s about 2-2.5 nanotesla at satellite altitude, which is about 20,000 times weaker than the Earth’s global magnetic field.”... Oceans may have a small contribution to the magnetic field that protects the planet from harmful cosmic rays, but it remains to be...
  • Earth Raised Magnetic Shield Earlier than Thought

    03/07/2010 7:44:00 PM PST · by SunkenCiv · 22 replies · 168+ views
    Discovery News ^ | Thursday, March 4, 2010 | Irene Klotz
    Young Earth was cocooned in a protective shield that magnetically deflected killer solar radiation 200 million years earlier than previously thought, a key factor that allowed life to take hold, according to a new study published this week in the journal Science. The research, based on analysis of ancient silicate crystals from South Africa, has implications for the search for life beyond Earth, which to date has focused on finding planets where liquid water can exist. The study by University of Rochester geophysicist John Tarduno and colleagues suggests that the ability of a planet to generate a large magnetic field...
  • How long have the Scientists Known?

    02/03/2006 4:08:01 AM PST · by nextage · 25 replies · 627+ views
    Nextage Mission ^ | 3.02.2006 | nextage
    How long have the scientists known about the predicted pole-shift, expected date and likely causes, outcomes?
  • Earth's Magnetic Field Weakens 10 Percent (and some other stuff)

    12/12/2003 6:26:01 PM PST · by NormsRevenge · 20 replies · 588+ views
    Yahoo News ^ | 12/12/03 | Andrew Bridges - AP
    SAN FRANCISCO - The strength of the Earth's magnetic field has decreased 10 percent over the past 150 years, raising the remote possibility that it may collapse and later reverse, flipping the planet's poles for the first time in nearly a million years, scientists said Thursday.   At that rate of decline, the field could vanish altogether in 1,500 to 2,000 years, said Jeremy Bloxham of Harvard University. Hundreds of years could pass before a flip-flopped field returned to where it was 780,000 years ago. But scientists at a meeting of the American Geophysical Union cautioned that scenario is an...
  • Textbook Case of Tectonic Movement is Wrong, Says New Study

    08/22/2003 6:43:59 AM PDT · by forsnax5 · 14 replies · 6+ views
    University of Rochester ^ | August 22, 2003 | John Tarduno, Rory Cottrell
    Textbook Case of Tectonic Movement is Wrong, Says New Study Results from an expedition to the sea floor near the Hawaiian Islands show evidence that the deep Earth is more unsettled than geologists have long believed. A new University of Rochester study suggests that the long chain of islands and seamounts, which is deemed a "textbook" example of tectonic plate motion, was formed in part by a moving plume of magma, upsetting the prevailing theory that plumes have been unmoving fixtures in Earth's history. The research will be published in the August 22 issue of Science. "Mobile magma plumes force...
  • Africa PHENOMENON threatens to FLIP Earth's magnetic field, taking the poles with it

    03/08/2018 10:41:30 AM PST · by SunkenCiv · 101 replies
    Express.co.uk ^ | Wednesday, March 7, 2018 | Sakura Evans
    New research shows the most significant weakening is happening under Africa which has been dubbed the 'South Atlantic Anomaly' (SAA). As well as giving us our north and south poles, the magnetic field blankets the Earth, protecting it from solar winds and cosmic radiation. The forcefield has weakened significantly over the past 160 years and scientists now suggest it could be in the process of flipping. Such a change would be a switch in magnetic polarity and would see compasses point south rather than north. Scientists believe such an occurrence has actually happened several times in the history of our...
  • NASA: Earth's Last Full Magnetic-Pole Reversal Occurred 780,000 Years Ago --"We Are Over Due"

    02/01/2017 9:05:34 PM PST · by MtnClimber · 53 replies
    The Daily Galaxy ^ | 1 Feb, 2016
    The Earth’s continuously changing magnetic field surrounds the planet like an invisible force field – deflecting highly charged solar particles. Reversals are the rule, not the exception. Earth has settled in the last 20 million years into a pattern of a pole reversal about every 200,000 to 300,000 years, although it has been more than twice that long since the last reversal, the Brunhes-Matuyama, that occurred around 780,000 years ago. A temporary reversal, the Laschamp event, occurred around 41,000 years ago, and lasted less than 1,000 years with the actual change of polarity lasting around 250 years. Our planet’s history...