Sentences with phrase «reversed magnetic polarity»

However i had applied this same idea to the longer Bruckner cycle, which at 35 or 36 years presents the reversed magnetic polarity but at double the period of 71 years has the polarities the same.»

«since then he has been attracted by the same possibility that absorbed Dr. Abott, of washington, for a time, namely that of using a single cycle based on the discovery by Ellery Hale, of Mt. Wilson, that the sun reverses its magnetic polarity in the spots with every sunspot period.

Not exact matches

For example, scientists don't understand why the magnetic field is as strong as it is, or why the field reverses polarity — the North Pole becomes the South Pole and vice versa — every several hundreds of thousands of years, briefly vanishing in between.

The hypothesis has been strengthened recently by the discovery that bands of alternating normal and reversed magnetism parallel the mid-ocean ridges, apparently indicating upwellings of molten rock during different magnetic «polarity epochs.»»

The Earth's magnetic field takes an average of only 7000 years to reverse its polarity, but the switch happens much more quickly near the equator, according to the most comprehensive study yet of the last four reversals.

Scientists have long wondered why the polarity of the earth's magnetic field occasionally reverses.

The astrophysicists knew what it was because the spot's magnetic polarity is the reverse of the previous sunspots, says Hal Zirin, director of Caltech's Big Bear Solar Observatory.

Using LOS magnetograms, the authors observed a small region of transient polarity - reversed magnetic field in the main sunspot of NOAA 11429 on 13 March 2012, which corresponded with flare brightenings seen in intensity images.

At the end of a cycle, the magnetic field rapidly reverses its polarity.

On a permanent magnet motor, you effectively just reverse one magnetic field (the rotor) when reversing polarity, and that it why they will rotate in the opposite direction.

Therefore both the stator and rotors are using coils from the same feed and reversing the polarity of the feed reverses the direction of the magnetic fields on both the stator coils and rotor coil - the result being that the motor will rotate in the same direction as before anyway.

As the polarity of the solar magnetic dipole reverses at every solar maximum, the first idea to come in mind is that LOD would follow a approx 22 year period.

The solar magnetic cycle that flips polarity at the poles approximately every 11 years is dependent on the reversing flux from spent sunspots that migrate to the poles.

Scenario for a climate disaster movie suggests itself — when the Earth's magnetic field goes to nothing on the way to reversing polarity.