The Solar Magnetic Mean Field
(SMMF), mainly caused by the sunspots, is measured on
the entire solar surface. In its progression, the 11
year solar cycle can be recognised. Since also other
phenomena contribute to its total value, the 27 day
period of the solar rotation becomes apparent. The SMMF
changes according to the predominant polarity of the
magnetic field and can therefore become negative, whereas
the sun spot number always stays positive.
The data used here are daily averages from the Wilcox
Solar Observatory and can be obtained from the following
In the image, the Solar Magnetic Meanfield can be recognized
as a circle, changing its size according to the measured
value and thus defining a boarder between the ordered
grid and the disarranged structure. Additionally the
27 day average is shown as a second circle, showing
its value by a change of colour. Interpolated values
are indicated by a point in the centre of the image.
The value of the Solar Magnetic Meanfield changes the
sound of a double bass, which is played by the data
of the solar wind. The principle is similar to the sonification
of the Irradiance; the higher the measured value, the
stronger the alteration.