Cyclones - Hurricane The Earth's Magnetic Field The Earth...

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The swirling motions evident in the preceding animations are consequences of frontal systems anchored to high and low pressure systems, which are also called anticyclones and cyclones , respectively. The wind flow around high pressure (anticyclonic) systems is clockwise in the Northern hemisphere and counterclockwise in the Southern hemisphere. The corresponding flow around low pressure (cyclonic) systems is counterclockwise in the Northern hemisphere and clockwise in the Southern hemisphere. This is a consequence of the Coriolis force, as illustrated for the Northern hemisphere in the following figure. Low pressure systems (left) and high pressure systems (right) in the Northern hemisphere Here is a pronounced example of a cyclone: a movie of Hurricane Andrew (653 kB). This animation is a loop of infrared satellite images showing the path of
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Unformatted text preview: Hurricane The Earth's Magnetic Field The Earth has a substantial magnetic field, a fact of some historical importance because of the role of the magnetic compass in exploration of the planet. Structure of the Field The field lines defining the structure of the magnetic field are similar to those of a simple bar magnet, as illustrated in the following figure. The Earth's magnetic field and Van Allen radiation belts It is well known that the axis of the magnetic field is tipped with respect to the rotation axis of the Earth. Thus, true north (defined by the direction to the north rotational pole) does not coincide with magnetic north (defined by the direction to the north magnetic pole) and compass directions must be corrected by fixed amounts at given points on the surface of the Earth to yield true directions....
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This note was uploaded on 12/04/2011 for the course ANT ANT2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Cyclones - Hurricane The Earth's Magnetic Field The Earth...

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