Magnetic storm

A magnetic storm (syn. : magnetic storm ) causes abrupt and intense fluctuations terrestrial magnetism related to the variations of the solar activity. The electric layers in the ionosphere would vary the intensity of the involving terrestrial magnetic field of many magnetic storms.

Principal effects

variation of the direction of the needle of the Compass;
fluctuations of the intensity of magnetic induction, mainly the horizontal component;
electric noise induced in the telephone cables;
important disturbances of the ionospheric propagation of the radio waves;
appearances of the polar lights.

Various types

the storm at abrupt beginning (SC: Storm Sudden Beginning ) which touches all the Latitude S, more intense during the maximum ones of the solar cycle and according to the solar eruptions (chromospheric) of a few tens of hours, it is accompanied by an intense emission of Ultraviolet rays affecting the ionospheric layers D and E being added to downpours of fast protons;
the storm at progressive beginning: of average intensity, with the more localized consequences and often occurring with a certain regularity corresponding to the period of rotation of the Sun on itself.

The monitoring of the solar activity can help to predict certain disturbances in the Propagation of the waves whose consequences can be serious for the Télécommunications. In 1965, enormous a Power cut had plunged the inhabitants of the continent of North America in the darkness, that is to say 30 million people on 200000 km2. In 1989, it is a breakdown pareillement caused which touched 6 million people in Quebec — and which generated polar lights until the Texas.

References

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