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Ill Association of the Aurora with
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active aurora active forms Antarctic Peninsula appeared April arc of brightness arc seen Argentine Islands aurora at Halley aurora seen aurora was seen auroral light auroral observations Bamburgh Castle bands of brightness British Antarctic Survey clear dark periods conjugate to Halley contour diagram Cook Inlet corona diffuse surfaces diﬂuse diurnal variation elevation equatorial plane coordinates ﬂaming rays frequency of occurrence geomagnetic latitude Halley Bay homogeneous arc homogeneous band Insensitive magnetogram interference rings ionospheric K-indices magnetic midnight maximum frequency mc./sec multiple arcs Northern Hemisphere northern horizon number of occurrences obscured by cloud overhead aurorae Percentage frequency point conjugate quiet arcs rayed arc rayed bands rayed forms rays and diffuse rays converging reported a display reported a rayed rings were detected seen at Halley seen from Halley shows sporadic sunspot maximum surfaces and rays throughout the night twilight U.S.C.G.C. Coos Bay U.T. At Halley U.T. the arc UNIVERSAL TIME FIGURE zenith