
%0 Journal Article
%A Poulter, E.M. 
%A Allan, W. 
%T The spatial integration of transient ULF pulsations observed by ground based magnetometers
%J Exploration Geophysics
%D 1986/03/01
%V 17
%N 1
%P 10-11
%K 
%R https://doi.org/10.1071/EG986010
%U https://www.publish.csiro.au/paper/EG986010 
%X The major source of damping for resonant ULF pulsations is thought to be joule dissipation in the conducting ionosphere. determined by the Pedersen conductance, Sp. Transient pulsations (i.e. short-lived pulsations with latitude-dependent periods) are toroidal mode oscillations of the geomagnetic field shells (Poulter &amp; Nielsen 1982), and are often associated with SSC and SI. In this paper empirical models of the toroidal mode east-west Hall current density J were used to calculate the associated ground magnetic fields in an attempt to resolve the following points: (1) decay rates observed by ground magnetometers are in general larger than those observed by satellites and predicted by theory; (2) estimates of'the Pedersen conductance using ground magnetometer derived decay rates seem too low (Glassmeier et al. 1984); (3) ground magnetometer observations of transient pulsations may show little or no period variation with latitude (Allan et al. 1985); (4) the effect of non-monotonic latitudinal period variations (e.g. the plasmapause). 
