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High latitude pulsating aurorae
Author(s) -
Craven M.,
Burns G. B.
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i009p01251
Subject(s) - noon , latitude , low latitude , high latitude , atmospheric sciences , local time , physics , magnetosphere , geology , geodesy , plasma , statistics , mathematics , quantum mechanics
We report here the significant occurrence of pulsating aurorae in the high latitude post‐noon auroral oval. Observations of aurorae at Davis, Antarctica (Inv. 74.5°S, Geog. 78.0°E, 68.6°S) during the 1988 Austral winter indicate pulsating auroral activity peaks at around 14.5% in the period 1330–1400 magnetic local time (MLT). Post‐noon high latitude pulsating aurora is typically a less than 250 R enhancement on a 1 kR background in the OI emission at 558 nm. Pulsation periods tend to be longer at 20–30 s compared to average auroral zone fluctuations of around 2–10 s. Similar to auroral zone stations, the optical fluctuations are always accompanied by Pi(c) magnetic pulsations. Weak Kp and IMF trends are present in the data.