1) Magnetic device 
The term magnetogram has two meanings, used separately in the contexts of magnetic fields of the Sun and the Earth. In the context of the magnetic field of the Sun, the term magnetogram refers to a pictorial representation of the spatial variations in strength of the solar magnetic field. Magnetograms are often produced by exploiting the Zeeman ef...
(from the article `geomagnetic field`) ...Typical scale factors for such observatories correspond to 2–10 nanoteslas per millimetre vertically and 20 millimetres per hour horizontally. A ...
At left, a magnetogram showing solar surface magnetic field structures; and, at right, Skylab photograph in ultraviolet of some area. Credits: Magnetogram from Kitt Peak National Laboratory; photo from Naval research Laboratory and NASA A chart that shows the strength, polarity, and distribution...
Solar magnetograms are a graphic representation of solar mag- netic field strengths and polarity.
magnetogram; magnetograph A graphic representation of magnetic field strengths and polarity.