The Association of Pulsating and Flaming Auroras with Complete Ionospheric Absorption at Macquarie Island

Abstract

Records of simultaneous auroral observations and ionosphere soundings at Macquarie Island (geomagnetic lat. -61· 7°) show that pulsating or flaming auroras are frequently accompanied by complete absorption of the vertically incident waves. However, the nocturnal variations of frequency of occurrence of these two phenomena are markedly different in form.