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Keyword: magnetosphere

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  • Earth and Venus are the Same Size, so Why Doesn’t Venus Have a Magnetosphere?....

    12/12/2017 10:53:55 AM PST · by BenLurkin · 54 replies ^ | | Matt Williams
    According to a new study conducted by an international team of scientists, it may have something to do with a massive impact that occurred in the past. Since Venus appears to have never suffered such an impact, its never developed the dynamo needed to generate a magnetic field. ... According to the most widely-accepted models of planet formation, terrestrial planets are not formed in a single stage, but from a series of accretion events characterized by collisions with planetesimals and planetary embryos – most of which have cores of their own. Recent studies on high-pressure mineral physics and on orbital...
  • How to Give Mars an Atmosphere, Maybe

    11/20/2017 1:18:57 PM PST · by LibWhacker · 42 replies
    Nautilus ^ | 11/17/17 | Marc Kaufman
    The plan for an artificial Martian magnetosphere may sound “fanciful,” but researchers say that emerging research is starting to show that a miniature magnetosphere can be used to protect humans and spacecraft.NASA Earth is most fortunate to have vast webs of magnetic fields surrounding it. Without them, much of our atmosphere would have been gradually torn away by powerful solar winds long ago, making it unlikely that anything like us would be here.Scientists know that Mars once supported prominent magnetic fields as well, most likely in the early period of its history when the planet was consequently warmer and...
  • Researchers Have Found Evidence of Cracking in the Magnetosphere

    11/07/2016 9:37:46 AM PST · by BenLurkin · 31 replies ^ | 11/06/2016 | Jelor Gallego
    Back in June 2015, a burst of galactic cosmic rays born from a giant cloud of plasma on the Sun’s corona struck Earth’s magnetic field at 2.5 million kph pounded for two hours. This produced radio signal blackouts at high altitude areas and created an unusually pronounced aurora borealis. The GRAPES-3 muon telescope, located in the Tata Institute in India, has determined those cosmic rays actually cracked the magnetosphere, warping its size and allowing additional radiation to pass through. The bombardment was able to compress the magnetosphere, from 11 to 4 times the radius of Earth. The telescope also detected...
  • Earth’s “Magnetosphere” Collapsed in Space Today for Two+ Hours! Trouble Ahead for All of Us

    04/24/2016 2:15:16 PM PDT · by SubMareener · 156 replies
    BPEarthWatch ^ | Apr 24, 2016 | BPEarthWatch
    Earth’s “Magnetosphere” COLLAPSED in space TODAY for two+ hours! Trouble ahead for all of us A stunning and terrifying event has taken place in space surrounding our planet; for two hours today, earth’s “Magnetosphere” COLLAPSED around the entire planet! The magnetosphere is what protects earth from solar winds and some radiation. EARTH’S MAGNETOSPHERE Deep within the Earth, a fierce molten core is generating a magnetic field capable of defending our planet against devastating solar winds. The protective field, called the “magnetosphere” extends thousands of miles into space and its magnetism affects everything from global communication to animal migration and weather...
  • Astronomy Picture of the Day -- Auroras and the Magnetosphere of Jupiter

    04/06/2016 7:01:07 AM PDT · by SunkenCiv · 3 replies
    NASA ^ | Wednesday, April 06, 2016 | (see photo credit)
    Explanation: Jupiter has auroras. Like near the Earth, the magnetic field of our Solar System's largest planet compresses when impacted by a gust of charged particles from the Sun. This magnetic compression funnels charged particles towards Jupiter's poles and down into the atmosphere. There, electrons are temporarily excited or knocked away from atmospheric gases, after which, when de-exciting or recombining with atmospheric ions, auroral light is emitted. The featured illustration portrays the magnificent magnetosphere around Jupiter in action. In the inset image released last month, the Earth-orbiting Chandra X-ray Observatory shows unexpectedly powerful X-ray light emitted by Jovian auroras, depicted...
  • Forget global warming, worry about the MAGNETOSPHERE: Earth's magnetic field is collapsing ...

    01/28/2014 4:32:23 AM PST · by Daffynition · 89 replies
    Daily Mail ^ | 27 January 2014 | Ellie Zolfagharifard
    Full title: Forget global warming, worry about the MAGNETOSPHERE: Earth's magnetic field is collapsing and it could affect the climate and wipe out power grids Deep within the Earth, a fierce molten core is generating a magnetic field capable of defending our planet against devastating solar winds. The protective field extends thousands of miles into space and its magnetism affects everything from global communication to animal migration and weather patterns. But this magnetic field, so important to life on Earth, has weakened by 15 per cent over the last 200 years. And this, scientists claim, could be a sign that...
  • ScienceCasts: Hidden Magnetic Portals Around Earth

    06/29/2012 3:21:43 PM PDT · by tired&retired · 25 replies
    NASA Science ^ | June 28, 2012 | NASA Science
    A NASA-sponsored researcher at the University of Iowa has developed a way for spacecraft to hunt down hidden magnetic portals in the vicinity of Earth. These portals link the magnetic field of our planet to that of the sun. Excellent video on the science of our magnetosphere and how we are just learning about field reversal that open and close between earth and the sun.
  • ScienceCasts: The Surprising Power of a Solar Storm

    06/29/2012 3:14:56 PM PDT · by tired&retired · 10 replies
    NASA Science ^ | March 22, 2012 | NASA Science
    A flurry of solar activity in early March dumped enough heat in Earth's upper atmosphere to power every residence in New York City for two years. The heat has since dissipated, but there's more to come as the solar cycle intensifies. At 2:16 minutes into the video it very clearly says that the CO2 is one of the most efficient coolants in the atmosphere and that it reflected 95% of the radiation back into outer space. This entire series of videos is excellent.
  • A Giant Breach in Earth's Magnetic Field

    12/16/2008 2:11:19 PM PST · by TaraP · 203 replies · 5,747+ views
    NASA ^ | Dec 16th, 2008
    Dec. 16, 2008: NASA's five THEMIS spacecraft have discovered a breach in Earth's magnetic field ten times larger than anything previously thought to exist. Solar wind can flow in through the opening to "load up" the magnetosphere for powerful geomagnetic storms. But the breach itself is not the biggest surprise. Researchers are even more amazed at the strange and unexpected way it forms, overturning long-held ideas of space physics. "At first I didn't believe it," says THEMIS project scientist David Sibeck of the Goddard Space Flight Center. "This finding fundamentally alters our understanding of the solar wind-magnetosphere interaction." The opening...
  • Astronomy Picture of the Day 10-15-02

    10/15/2002 3:13:14 PM PDT · by petuniasevan · 5 replies · 310+ views
    NASA ^ | 10-15-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 October 15 Aurora's Ring Credit & Copyright: Trygve Lindersen Explanation: Gusting solar winds and blasts of charged particles from the Sun made the early days of October rewarding ones for those anticipating auroras. While out enjoying the stormy space weather from Toemmeraas, Norway, Trygve Lindersen recorded this picturesque apparition of the northern lights with a digital camera on October 6. From this perspective, the curtains of green...