Spectral and fractal analyses of geomagnetic and riometric antarctic observations and a multidimensional index of activity

The Istituto Nazionale di Geofisica under the P.N.R.A. (National Program of Research in
Antarctica) has the responsibility of acquiring geophysical observations at the Italian Antarctic Base of Terra Nova Bay. Among others, geomagnetic and riometric data can provide some new insights into local
and global activity of the magnetosphere-ionosphere coupling. This article investigates some properties of
these kinds of data by means of spectral and fractal analyses. In addition, a multidimensional index is derived from this single-point dataset to represent not only the local but also the global state of the
magnetospheric activity.