Interesting fact about our awesome planet June 7, 2019-magnetic field
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Started by metmike - June 7, 2019, 1:07 a.m.


#16                                                                                                                                The magnetic pole creeps                                                                    

The magnetic pole creeps


Earth has a magnetic field because of the ocean of hot, liquid metal that sloshes around its solid iron core, or that's what geophysicists are pretty certain is the cause. This flow of liquid creates electric currents, which, in turn, generate the magnetic field. Since the early 19th century, Earth's magnetic north pole has been creeping northward by more than 600 miles (1,100 kilometers), according to NASA scientists.

The rate of movement has increased, with the pole migrating northward at about 40 miles (64 km) per year currently, compared with the 10 miles (16 km) per year estimated in the 20th century.

Earth’s magnetic field also varies in strength, and recently it was found to be weakening.                                                                                                                                                                    

By metmike - June 7, 2019, 1:10 a.m.
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Earth's magnetic field

  Computer simulation of the Earth's field in a period of normal polarity between reversals.[1] The lines represent magnetic field lines, blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and vertical. The dense clusters of lines are within the Earth's core

Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from the Earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun. The magnetic field is generated by electric currents due to the motion of convection currents of molten iron in the Earth's outer core: these convection currents are caused by heat escaping from the core, a natural process called a geodynamo. The magnitude of the Earth's magnetic field  at its surface ranges from 25 to 65 microteslas (0.25 to 0.65 gauss).[3] As an approximation, it is represented by a field of a magnetic dipole currently tilted at an angle of about 11 degrees with respect to Earth's rotational axis, as if there were a bar magnet placed at that angle at the center of the Earth. The North geomagnetic pole, currently located near Greenland in the northern hemisphere, is actually the south pole of the Earth's magnetic field, and conversely.

While the North and South magnetic poles are usually located near the geographic poles, they slowly and continuously move over geological time scales, but sufficiently slowly for ordinary compasses to remain useful for navigation. However, at irregular intervals averaging several hundred thousand years, the Earth's field reverses and the North and South Magnetic Poles respectively, abruptly switch places. These reversals of the geomagnetic poles leave a record in rocks that are of value to paleomagnetists in calculating geomagnetic fields in the past. Such information in turn is helpful in studying the motions of continents and ocean floors in the process of plate tectonics.

The magnetosphere is the region above the ionosphere that is defined by the extent of the Earth's magnetic field in space. It extends several tens of thousands of kilometers into space, protecting the Earth from the charged particles of the solar wind and cosmic rays that would otherwise strip away the upper atmosphere, including the ozone layer that protects the Earth from harmful ultraviolet radiation.

By silverspiker - June 7, 2019, 1:10 a.m.
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.... dude .... this is daddy's little secret ..... except.... I am not a daddy ....

By silverspiker - June 7, 2019, 1:12 a.m.
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yes .... I already dissolved the information on "Delta Dawn" .... "what's that flower you have on " ????

    = Could It Be A Flowe.../r       Of Days' gONE bY ?????

By carlberky - June 7, 2019, 8:49 a.m.
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Owing to motion of fluid in the Earth's outer core, the actual magnetic poles are constantly moving. However, over thousands of years their direction averages to the Earth's rotation axis. On the order of once every half a million years, the poles reverse (north switches place with south).

By metmike - June 7, 2019, 1:28 p.m.
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Without the magnetic field protecting us, life as we know it would not exist on this planet!!

Earth's Magnetic Field is A Ruthless, Solar-Wind-Shredding Machine

                    Earth's magnetic field slices through harsh solar winds like a ship cruises through water. Scientists might finally know how.                    Credit: NASA                

Earth is constantly being bombarded by a hot, soupy plasma of protons, electrons and ions loosed by the sun in the form of solar wind. These winds blow all day and in all directions, blasting out of our nearest star at speeds of up to 500 miles per second (800 kilometers per second) and temperatures of up to 2.9 million degrees Fahrenheit (1.6 million degrees Celsius), according to NASA. You'd think that would be more than enough to bake our planet into a giant, orbiting lump of ash, but Earth and its atmosphere remain largely unscathed thanks to the planet's strong magnetic field.

As Earth cruises through the black sea of space at about 67,000 mph (108,000 km/h), the planet's magnetic field pushes aside solar wind — the constant stream of plasma particles ejected by the sun — the same way the bow of a speeding motorboat pushes aside water. Scientists call this phenomenon "bow shock" because of its similarity to a ship surging through stubborn waves.

Researchers have long suspected that we can thank this bow shock for reducing the scorching solar wind into the mild breezes we feel on Earth, but they didn't know exactly how this happened. Now, a new paper published May 31 in the journal Physical Review Letters adds a few billion electron-size pieces to the puzzle. [Rainbow Album: The Many Colors of the Sun]

In a study led by researchers at the University of Maryland and NASA's Goddard Space Flight Center in Maryland, scientists delved into data obtained by four NASA satellites that have been studying the collision zone between the solar wind and Earth's magnetic shield since 2015. They found that, when the solar wind smashes against Earth's bow shock, solar electrons accelerate so rapidly that they literally break apart, converting potentially destructive energy into innocuous heat.

"As the solar wind crashes into Earth's magnetic field, the bow shock protects us by slowing down this wind and changing it to a nice, warm breeze," lead study author Li-Jen Chen, an astronomer at the University of Maryland, said in a statement. "We now have a better idea how this happens."

By mcfarmer - June 7, 2019, 2:59 p.m.
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One idea for  the planet Mars is that it’s core wasn’t big enough to sustain a magnetic field, hence the lost atmosphere.

By metmike - June 7, 2019, 4:35 p.m.
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This is true