UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Altitude Distribution of the Auroral Acceleration Potential Determined from Cluster Satellite Data at Different Heights

Marklund, GT; Sadeghi, S; Karlsson, T; Lindqvist, PA; Nilsson, H; FORSYTH, C; Fazakerley, A; ... Pickett, J; + view all (2011) Altitude Distribution of the Auroral Acceleration Potential Determined from Cluster Satellite Data at Different Heights. Phys. Rev. Lett. , 106 (5) , Article 055002. 10.1103/PhysRevLett.106.055002. Green open access

[thumbnail of 1302972.pdf]
Preview
PDF
1302972.pdf

Download (668kB)

Abstract

Aurora, commonly seen in the polar sky, is a ubiquitous phenomenon occurring on Earth and other solar system planets. The colorful emissions are caused by electron beams hitting the upper atmosphere, after being accelerated by quasistatic electric fields at 1–2 RE altitudes, or by wave electric fields. Although aurora was studied by many past satellite missions, Cluster is the first to explore the auroral acceleration region with multiprobes. Here, Cluster data are used to determine the acceleration potential above the aurora and to address its stability in space and time. The derived potential comprises two upper, broad U-shaped potentials and a narrower S-shaped potential below, and is stable on a 5 min time scale. The scale size of the electric field relative to that of the current is shown to depend strongly on altitude within the acceleration region. To reveal these features was possible only by combining data from the two satellites.

Type: Article
Title: Altitude Distribution of the Auroral Acceleration Potential Determined from Cluster Satellite Data at Different Heights
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.106.055002
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.106.055002
Language: English
Additional information: © 2011 The American Physical Society
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1302972
Downloads since deposit
161Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item