Terrestrial Magnetism Flashcards
1
Q
Magnet convention
A
~north seeking pole
~south seeking pole
2
Q
Dip
A
Magnetic dip is the angle between the horizontale component and the total field
3
Q
Isogonals and agonic lines
A
ISOGONALS: lines of equal variation
AGONIC: line of ZERO VARIATION
4
Q
Changes of magnetic field
A
~long term changes : SECULAR, movement of the poles
~short term predictable changes;ANNUAL due to earth orbit around sun;DIURNAL daily changes associated with changes in height of ionosphere
~short term unpredictable changes:
Solar wind,magnetic poles movemnt ,high latitudes
5
Q
Agonic lines
A
Zero variation : there are only two lines over the earth
6
Q
Isogonic
A
Variation of equal value
7
Q
Magnetic variation
A
1 degree every 6/7 years
