Conjugacy of proton and electron auroras observed near L=6.1

Abstract

Simultaneous observations using two‐channel meridian scanning photometers were carried out at geomagnetically conjugate‐pair stations, Syowa Station in Antarctica and Husafell in Iceland (L=6.1), during August‐September 1984. The photometers were equipped with interference filters for OI 5577A and Hß 4861A emissions. During the conjugate campaign, the data obtained on September 26, 1984 was of the highest quality with a clear sky and no moon. The initial results on the conjugacy of Hß proton auroras and their relations to 5577A electron auroras are as follows; i) During the pre‐breakup phase the Hß auroras observed at Syowa were mostly located at a lower latitude than the simultaneous conjugate auroras observed at Husafell. Such Hß auroras showed high intensities at Syowa relatively to those at Husafell, ii) During the auroral breakup phase, enhancement of Hß emissions occurred almost simultaneously in the both hemispheres. However, the intensities of Hß auroras were higher at Husafell than at Syowa, iii) During the pre‐breakup phase, Hß auroras observed continuously in the equator boundary were associated with weak diffuse 5577A auroras in the conjugate regions, (iv) In the regions and time intervals where 5577A auroras showed poor conjugacy, the Hß auroras also showed poor conjugacy.