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| Aurora |
(l.c.) bands or streamers of light that appear in the sky at night in areas around the magnetic poles, caused by solar particles striking atoms in the outer part of the earth's atmosphere. (See aurora australis, aurora borealis.) [1/3 definitions] |
| dipole |
a pair of electric charges or magnetic poles that are of equal magnitude but opposite polarity. [1/3 definitions] |
| magnetic needle |
a thin magnetized bar of steel situated within an instrument, such as a compass, so that it indicates the direction of the earth's magnetic poles. |
| magnetic north |
the northern direction indicated by a magnetic needle, in line with the earth's magnetic pole but usu. not true north. |
| North Pole |
(l.c.) see "magnetic pole." [1/4 definitions] |
| South Pole |
(l.c.) see "magnetic pole." [1/4 definitions] |
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