|Reference : Ground-based photometric observations of the type A aurora of 17-18 December 1971|
|Scientific journals : Article|
|Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics|
|Ground-based photometric observations of the type A aurora of 17-18 December 1971|
|Gérard, Jean-Claude [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]|
|Annales de Géophysique|
|Editions de la Revue d'Optique Théorique et Instrumentale|
|[en] AURORAL ZONES ; ELECTRON PRECIPITATION ; LUMINOUS INTENSITY ; MAGNETIC STORMS ; PHOTOMETRY ; COLLISION RATES ; ELECTRON FLUX DENSITY ; GROUND STATIONS ; H BETA LINE ; IONIC COLLISIONS ; LINE SPECTRA ; MAGNETIC DISTURBANCES ; PARTICLE PRODUCTION ; SUDDEN STORM COMMENCEMENTS|
|[en] Ground-based observations have been made during the event of 17-18 Dec. 1971 from northern Norway, using a tilting-filter photometer monitoring the intensities of N2(plus) 1.Neg., H-beta, 6300-A O-I, and 5200-A N-I. The high 6300-A/N2(plus) 1.Neg ratio classes this event among type A auroras. The 6300-A/5200-A ratio varies during the night and remains higher than the usual value of nearly 20. These observations are compatible with a soft electron flux as the origin of the red line enhancement as illustrated by comparison with a model aurora. It is also found that N(2Do) is deactivated by collisions with electrons at a rate foreseen by theoretical calculations. An upper limit of about 40 seconds is derived for the N(2Do) effective lifetime, though no simple relationship gives a good fit to the observations.|
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