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Dual spacecraft determinations of magnetopause motion

Bauer, TM; Dunlop, MW; Sonnerup, BUO; Sckopke, N; Fazakerley, AN; Khrabrov, AV; (2000) Dual spacecraft determinations of magnetopause motion. Geophysical Research Letters , 27 (13) 1835 - 1838. 10.1029/2000GL000041. Green open access

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Abstract

We examine the motion of Earth's magnetopause for 16 dawnside traversals of this boundary by the sister spacecraft AMPTE/UKS and IRM in December, 1984, when their separation was 400-900 km. We compare magnetopause normal vectors, n, and speeds of motion, u(n), obtained separately from each spacecraft by use of three different methods, and also compare those u(n) to corresponding speeds, u(n)*, obtained from observed time lags between the two spacecraft. Agreement between u, values and n vectors determined from the three methods ranges from poor to excellent. Comparing u(n)* and u(n) values, we find a clear tendency for \ u(n)*\ to be larger than \ u(n)\: While slightly less than half of the results show reasonable agreement (0.5 < u(n)/u(n)* < 2), there are about as many results in the range 0 < u(n)/u(n)* < 0.5, and a few cases give the wrong sign of u(n).

Type: Article
Title: Dual spacecraft determinations of magnetopause motion
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2000GL000041
Publisher version: http://dx.doi.org/10.1029/2000GL000041
Language: English
Additional information: Copyright 2000 by the American Geophysical Union
Keywords: Minimization, Residue, Layer
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/165363
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