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Occurrence and average behavior of pulsating aurora

Partamies, N., Whiter, D., Kadokura, A., Kauristie, K., Nesse Tyssøy, H., Massetti, S., Stauning, P. and Raita, Tero (2017) Occurrence and average behavior of pulsating aurora Journal of Geophysical Research (doi:10.1002/2017JA024039).

Record type: Article


Motivated by recent event studies and modeling efforts on pulsating aurora, which conclude that the precipitation energy during these events is high enough to cause significant chemical changes in the mesosphere, this study looks for the bulk behavior of auroral pulsations. Based on about 400 pulsating aurora events, we outline the typical duration, geomagnetic conditions, and change in the peak emission height for the events. We show that the auroral peak emission height for both green and blue emission decreases by about 8 km at the start of the pulsating aurora interval. This brings the hardest 10% of the electrons down to about 90 km altitude. The median duration of pulsating aurora is about 1.4 h. This value is a conservative estimate since in many cases the end of event is limited by the end of auroral imaging for the night or the aurora drifting out of the camera field of view. The longest durations of auroral pulsations are observed during events which start within the substorm recovery phases. As a result, the geomagnetic indices are not able to describe pulsating aurora. Simultaneous Antarctic auroral images were found for 10 pulsating aurora events. In eight cases auroral pulsations were seen in the southern hemispheric data as well, suggesting an equatorial precipitation source and a frequent interhemispheric occurrence. The long lifetimes of pulsating aurora, their interhemispheric occurrence, and the relatively high-precipitation energies make this type of aurora an effective energy deposition process which is easy to identify from the ground-based image data.

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Accepted/In Press date: 26 April 2017
e-pub ahead of print date: 11 May 2017
Organisations: Physics & Astronomy


Local EPrints ID: 409595
ISSN: 0148-0227
PURE UUID: d19c8ef1-e3fd-440d-aa96-e77fd16556b3
ORCID for D. Whiter: ORCID iD

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Date deposited: 31 May 2017 04:02
Last modified: 12 Aug 2017 16:31

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Author: N. Partamies
Author: D. Whiter ORCID iD
Author: A. Kadokura
Author: K. Kauristie
Author: H. Nesse Tyssøy
Author: S. Massetti
Author: P. Stauning
Author: Tero Raita

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