
%0 Journal Article
%A Bond, FR 
%A Jacka, F 
%T Distribution of Auroras in the Southern Hemisphere. II. Nightly Probability of Overhead Aurora
%J Australian Journal of Physics
%D 1962/06/01
%V 15
%N 2
%P 261-272
%K 
%R https://doi.org/10.1071/PH620261
%U https://www.publish.csiro.au/paper/PH620261 
%X The probability P of overhead occurrence of aurora during a night is estimated for 22 southern hemisphere stations during the I.G.Y. The distribution of probability of occurrence is represented in terms of three measures of colatitude: 81 is defined in terms of the eccentric dipole representation of the geomagnetic field; 82 is defined in terms of projections from circles in the equatorial plane, along the geomagnetic lines of force, onto the Earth; 83 is defined in terms of the integral invariant f; (I-F IF m)!dl of charged particle motion in the geomagnetic field. 
