Inclination I
Angle between the geomagnetic
field and the local horizontal plane. Also the angle between a
remanent magnetisation
of a sample and the horizontal plane.
Induced magnetisation
Magnetic moment per unit of volume (A/m) or per unit of weight
(Am2/kg) of a magnetised
sample, measured in the presence
of a inducing magnetic field. The induced magnetisation is the sum of
two components: the remanent magnetisation (magnetisation that
remains when the magnetic field is removed) and the transient
magnetisation (magnetisation that
disappears when the magnetic
field is removed).
in-situ
The term in situ means, to an archaeomagnetist, unmoved since it
acquired its original magnetisation – whether deliberately or
accidental. It is thus far more specific than for an archaeologist for
which the terms usually means that the object is not foreign, i.e. from
outside the site.
Intensity F, M
The value or magnitude F of
the geomagnetic field
expressed in Tesla. Also the value or magnitude M of the remanent magnetisation of
a sample expressed in A/m
or Am2/kg.
International
geomagnetic reference model (IGRF)
Model for the global geomagnetic field of internal origin.
It is based on a global spherical
harmonical analysis and takes
also temporal variations of the field into account. Calculate the
geomagnetic field at your location for certain year: http://nssdc.gsfc.nasa.gov/space/model/models/igrf.html!
Iron-age
Denotes a time period in the development of the human society when
iron working was the most sophisticated form of metalworking. Its
hardness, high melting point and the abundance of iron sources favoured
its use. The Iron-age is subsequent to the Bronze-age. The Iron-age lasted in
Britain from around 500 BC to 500 AD or until the Roman conquest (43 AD
– 303 AD). In central Europe it lasted from about 800 BC until the
Roman conquest.
Isothermal remanent
magnetisation (IRM)
Remanent magnetisation acquired by a sample
after the application of a
constant or steady magnetic
field and removal of the field.