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The Aurora Australis
Diurnal Frequency of Occurrence
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active displays active forms all-sky camera ﬁlm appeared at h Auroral Forms Auroral Observations auroral zone azimuth British Antarctic Survey centre bearings clear dark periods clear moonlit periods cloud Coats Land colour dark and clear decreasing diffuse surfaces Diurnal frequency elevation equatorward Evans and Thomas exposure extended faded Falkland Islands ﬁgs ﬁgures ﬁrst detected ﬂaming motion ﬂuctuations frequency of occurrence further was seen geomagnetic latitude Geomagnetic midnight Halley Bay homogeneous arc interference ﬁlters International Geophysical interquartile range lower border magnetic Magnetogram maximum median latitudes movement Number of clear number of observations occurrence of aurorae Percentage frequency Plate Polar Aurora probability of occurrence quiet arcs quiet forms quiet-arc zone ray structure rayed band rayed forms RB3 Type red type Royal Greenwich Observatory Scott Base series of prints solar activity southern horizon southern sky sunspot transition U.T. The sky UNIVERSAL TIME FIGURE University of Edinburgh upper limits visible weak glow