what do you mean by magnetic declination and dip . explain, (a)isogonic line(b) agonic line(c) isoclinic line(d)aclinic line
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Magnetic Declination (θ): The angle between the magnetic meridian and geographic meridian at a place is called Magnetic Declination at that place.
Magnetic Inclination or Angle of Dip (I): It is the angle between the direction of total magnetic field of earth and a horizontal line in magnetic meridian.
a) Isogonic lines are lines on the Earth's surface along which the declination has the same constant value, and lines along which the declination is zero are called agonic lines. The lowercase Greek letter δ (delta) is frequently used as the symbol for magnetic declination.
b)In the year 1900, the Agonic Line passed roughly through Detroit and then was East of Florida. It currently passes roughly west of Chicago and through New Orleans. If a navigator is located on the Agonic Line, then the declination (variation) is zero.
c)Isoclinic lines are imaginary lines on the earth's surface connecting points where the earth's magnetic field has the same angle. Agonic lines are lines connecting places where true and magnetic north are the same. They're a special case of isogonic lines.
d)The line through those points on the earth's surface at which the magnetic dip is zero. The aclinic line is a particular case of an isoclinic line. On this line, a magnetic needle balances horizontally without dipping (i.e., the angle of dip is zero). Also called dip equator, magnetic equator, or aclinic line.
Magnetic declination -It is the angle on the horizontal plane between magnetic north and true north.
Magnetic dip-The angle that a magnetic needle makes with the horizontal plane at specific location. Magnetic dip is 0degree at the magnetic equator and 90degree at each of the magnetic poles. Also called magnetic inclination.
Isogonic line-An imaginary line on a map joining points on the earth's surface at which the magnetic declination is the same
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