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Keyword: magneticfield

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  • The spacecraft-killing anomaly over the South Atlantic

    02/20/2021 8:56:06 AM PST · by MtnClimber · 49 replies
    Astronomy ^ | 17 Feb, 2021 | Doug Adler
    A strange dent in Earth’s magnetic field doses orbiting craft with high levels of radiation. It's caused everything from periodic glitches to total mission failure. The European Space Agency’s Swarm satellites measure the strength of Earth’s magnetic field. In this image, cooler colors (blue) mean lower strength than warmer colors (pink). The large dark region is called the South Atlantic Anomaly Radiation is a colorless, tasteless, and odorless enemy to both humans and electronics alike. And, thanks to a quirk in Earth’s magnetic field, a region called the South Atlantic Anomaly (SAA) regularly exposes orbiting spacecraft to high levels of...
  • The Herky-Jerky Weirdness of Earth’s Magnetic Field

    12/23/2020 12:38:01 PM PST · by BenLurkin · 14 replies
    Eos ^ | 21 December 2020 | Jenessa Duncombe
    As astronomers peering into Earth’s interior, there is no way for them to “feel” the true nature of the core. ... Scientists have long been on this quest, sometimes with fatal consequences. Explorers of old perished trying to set up monitoring stations in far-flung locales, like the doomed English explorer Sir John Franklin, whose expedition to take magnetic observations of the North Pole in 1845 ended with 129 men dead and two ships lost. As soon as long-lasting ground observatories sprung up around the world, scientists noticed strange deviations in the field, including for example, that our magnetic North and...
  • NASA Is Tracking a Vast, Growing Anomaly in Earth's Magnetic Field

    08/18/2020 11:08:14 AM PDT · by amorphous · 77 replies
    Science Alert ^ | 18 August 2020 | PETER DOCKRILL
    NASA is actively monitoring a strange anomaly in Earth's magnetic field: a giant region of lower magnetic intensity in the skies above the planet, stretching out between South America and southwest Africa.
  • The Air Force May Ditch GPS for Earth's Magnetic Field... We're long overdue for a new way to navigate.

    08/07/2020 7:46:40 AM PDT · by Red Badger · 92 replies
    www.popularmechanics.com ^ | By Kyle Mizokami Aug 4, 2020
    The Air Force, wary of losing its GPS satellites during a major war, is exploring alternatives. One alternative is using a magnetic field map of Earth. Maps of Earth’s magnetic field are very accurate, but we don't know how data is gained about possible enemy territory. =================================================================================== The U.S. Air Force, concerned that adversaries might target its fleet of GPS satellites in wartime, is looking into Earth’s magnetic field as an alternative, according to Defense One.Accurate and extremely difficult to jam, the magnetic field could be used as a means of navigation for ground troops, ships at sea, and...
  • Weird: Out of Nowhere, Something Just Rocked Earth’s Magnetic Field

    06/26/2020 7:45:35 AM PDT · by zeestephen · 59 replies
    Watts Up With That ^ | 25 June 2020 | Anthony Watts
    A GLOBAL MAGNETIC ANOMALY: On June 23rd, Earth’s quiet magnetic field was unexpectedly disturbed by a wave of magnetism that rippled around much of the globe. There was no solar storm or geomagnetic storm to cause the disturbance. So what was it?
  • Search for MH370 Revealed Ocean Crust Waves

    06/12/2020 11:32:16 PM PDT · by SunkenCiv · 7 replies
    Science News by American Geophysical Union ^ | 8 June 2020 | Kimberly M. S. Cartier
    The scans for MH370 revealed that the ocean crust rises and falls in waves that start at the Southeast Indian Ridge and continue outward. The ridge spreads about 35 millimeters in opposite directions every year, and the wave crests, where crust grew faster, are more than 100 kilometers long and repeat every 10-14 kilometers. The researchers estimated when each wave formed by comparing the bathymetry maps to independent measurements and models of the crust's magnetic field. ...Crustal rocks record the polarity of Earth's magnetic field as they form, allowing scientists to trace the age of different sections of ocean crust....
  • The Mysterious Anomaly Weakening Earth's Magnetic Field Seems to Be Splitting

    05/27/2020 8:46:16 AM PDT · by BenLurkin · 15 replies
    Science Alert ^ | 26 MAY 2020 | PETER DOCKRILL
    The South Atlantic Anomaly is a vast expanse of reduced magnetic intensity in Earth's magnetic field, extending all the way from South America to southwest Africa. Since our planet's magnetic field acts as a kind of shield – protecting Earth from solar winds and cosmic radiation, in addition to determining the location of the magnetic poles – any reduction in its strength is an important event we need to monitor closely, as these changes could ultimately have significant implications for our planet. ...[T]here's nothing to be alarmed about. The ESA notes that the most significant effects right now are largely...
  • Part of Earth's Magnetic Field is Getting Weaker in 'Vigorously' Developing Anomaly, Scientists Say

    05/22/2020 9:17:17 PM PDT · by BenLurkin · 43 replies
    newsweek. ^ | 5/22/20 | Hannah Osborne
    Using satellite data, researchers believe an "anomaly" in the South Atlantic may have split in two, with the eastern section "developing vigorously." Earth's magnetic field is generated by movements within the planet's molten iron core. ...When the magnetic field is stronger, it blocks more radiation. When it is weaker, more radiation reaches the planet's surface. The magnetic field is constantly moving. It strengthens and weakens as part of normal fluctuations. According to the European Space Agency, the magnetic field has lost around 9 percent of its strength over the preceding two centuries. One section of the magnetic field has been...
  • Enigmatic Rupture in Earth’s Magnetic Field Caused New Type of Aurora, NASA Scientist Reveals

    12/29/2019 8:11:48 AM PST · by BenLurkin · 19 replies
    Sputnik ^ | 12/26/2019
    What prompted this “massive, but localised compression”, which looked like something punched the magnetic field, is unclear. The edge of the bubble rushed towards the Earth by about 25,000 kilometres, taking just 1 minute and 45 seconds. The researchers suggested that there might have been an unprecedented storm in the area where the solar particles sneak through our protective bubble, the magnetosphere. What caused the storm is not known. "This motion is something that we've never seen before. This eastward and then westward and then spiralling motion is not something that we've ever seen, not something we currently understand", Briggs...
  • Earth Enters Unknown as Magnetic North Pole Continues Push Toward Russia, Crosses Greenwich Meridian

    12/13/2019 2:22:18 PM PST · by Red Badger · 102 replies
    Sputniknews.com ^ | 15:08 13.12.2019 (updated 15:42 13.12.2019) | Staff
    Earlier this year, US National Oceanic and Atmospheric Administration and the British Geological Survey (BGS) were forced to update the World Magnetic Model a year ahead of schedule due to the speed with which the magnetic north pole is shifting out of the Canadian Arctic and toward Russia’s Siberia. The BGS and the US National Centers for Environmental Information has released a new update to the World Magnetic Model this week, confirming that the magnetic north pole, whose coordinates are crucial for the navigation systems used by governments, militaries and a slew of civilian applications, is continuing its push toward...
  • Climate and the Solar Magnetic Field (Upcoming Grand Minimum 2020 - 2050)

    11/10/2019 9:21:20 AM PST · by 11th_VA · 49 replies
    YouTube by GWPF ^ | Nov 8, 2018 | Professor Valentina Zharkova
    Video at the LinkUpcoming Modern Grand Minimum To occur 2020 - 2050 Big Impact on the terrestrial temperature via SI and reduction of Magnetic field Shortage of vegetation periods can lead to possible food shortage in 2028 - 2032 (Conclusions at the 45:00 minute mark)
  • Mysterious magnetic pulses discovered on Mars

    09/20/2019 8:31:03 PM PDT · by amorphous · 96 replies
    National Geographic ^ | PUBLISHED September 20, 2019 | Robin George Andrews
    At midnight on Mars, the red planet’s magnetic field sometimes starts to pulsate in ways that have never before been observed. The cause is currently unknown. That’s just one of the stunning preliminary findings from NASA’s very first robotic geophysicist there, the InSight lander. Since touching down in November 2018, this spacecraft has been gathering intel to help scientists better understand our neighboring planet’s innards and evolution, such as taking the temperature of its upper crust, recording the sounds of alien quakes, and measuring the strength and direction of the planet’s magnetic field. As revealed during a handful of presentations...
  • A Diamond the Size of Earth - is this Jupiter's core?

    12/28/2018 10:47:49 AM PST · by Red Badger · 57 replies
    www.guide-to-the-universe.com ^ | 12/28/2018 - Undated | Staff
    In his book "2061 - Odyssey Three" (the third of his Space Odyssey series), Arthur C. Clarke put forward the intriguing proposal that the core of the planet Jupiter was, in fact, a diamond the size of Earth. Now Clarke, even though a science fiction author of some repute, had a science background and always tried to bring rigorous scientific accuracy to his stories. So, could his proposition be possible? The somewhat predictable answer is - we don't know. But we can analyse the possibility within known scientific parametres, to see if it is, at least, possible. For diamond to...
  • Juno Finds that Jupiter’s Gravitational Field is “Askew”

    10/27/2017 7:55:03 AM PDT · by BenLurkin · 29 replies
    Jupiter’s gravity field varies with depth, which indicated that material is flowing as far down as 3,000 km (1,864 mi). Combined with information obtained during previous perijoves, this latest data suggests that Jupiter’s core is small and poorly defined. This flies in the face of previous models of Jupiter, which held that the outer layers are gaseous while the interior ones are made up of metallic hydrogen and a rocky core. ... Another interesting find was that Jupiter’s gravity field varies with depth, which indicated that material is flowing as far down as 3,000 km (1,864 mi). Combined with information...
  • A Whole New Jupiter: First Science Results from NASA’s Juno Mission

    05/25/2017 5:04:05 PM PDT · by BenLurkin · 16 replies
    nasa ^ | May 25, 2017 | Dwayne Brown / Laurie Cantillo
    Early science results from NASA’s Juno mission to Jupiter portray the largest planet in our solar system as a complex, gigantic, turbulent world, with Earth-sized polar cyclones, plunging storm systems that travel deep into the heart of the gas giant, and a mammoth, lumpy magnetic field that may indicate it was generated closer to the planet’s surface than previously thought. “We are excited to share these early discoveries, which help us better understand what makes Jupiter so fascinating,” said Diane Brown, Juno program executive at NASA Headquarters in Washington. "It was a long trip to get to Jupiter, but these...
  • Most Recent Reversal of Earth’s Magnetic Field Lasted 22,000 Years

    08/08/2019 2:00:05 PM PDT · by BenLurkin · 20 replies
    sci-news.com ^ | 08/08/2019
    The researchers combined magnetic readings and radioisotope dating of samples from seven lava flow sequences to recreate the magnetic field over a span of about 70,000 years centered on the latest geomagnetic reversal. They accurately dated the lava flows by measuring the argon produced from radioactive decay of potassium in the rocks. They found that the final reversal was quick by geological standards, less than 4,000 years. But it was preceded by an extended period of instability that included two excursions — temporary, partial reversals — stretching back another 18,000 years. The lava flow data was corroborated by magnetic readings...
  • Ancient Tree With Record of Earth's Magnetic Field Reversal in Its Rings Discovered

    07/15/2019 9:21:19 AM PDT · by SunkenCiv · 93 replies
    Newsweak ^ | Thursday, July 4, 2019 | Hannah Osborne
    An ancient tree that contains a record of a reversal of Earth's magnetic field has been discovered in New Zealand. The tree -- an Agathis australis, better known as its M&Ccedilori name kauri -- was found in Ngawha, on New Zealand's North Island, during excavation work for the expansion of a geothermal power plant, stuff.nz reports. The tree, which had been buried in 26 feet of soil, measures eight feet in diameter and 65 feet in length. Carbon dating revealed it lived for 1,500 years, between 41,000 and 42,500 years ago... The lifespan of the kauri tree covers a point...
  • {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...
  • 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...