Multiple-point electron measurements in a nightside auroral arc: Auroral Turbulence II particle observations
1999 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 26, no 22, 3361-3364 p.Article in journal (Refereed) Published
We report here three-point measurements of bursty, velocity-dispersed, field-aligned electron precipitation at the poleward edge of a northward-moving, post-breakup, nightside auroral arc. The three-point measurement allows detection of the proper motion of the inverted-V arc, which is shown to be 550 m/sec northward. The velocity dispersion patterns are fitted to find the source altitude of the precipitation bursts as a function of distance from the poleward edge of the are. These source points are interpreted to trace out the low-altitude boundary of the inverted-V potential drop, which is seen to rise both in time, and in the northward direction. The precipitation bursts under the inverted-V are seen to have an are-aligned velocity which varies with time, and which is consistent with the measured E x B local drift speed.
Place, publisher, year, edition, pages
1999. Vol. 26, no 22, 3361-3364 p.
2407 Ionosphere: Auroral ionosphere, 2455 Ionosphere: Particle precipitation, 2494 Ionosphere: Instruments and techniques, 7807 Space Plasma Physics: Charged particle motion and acceleration
IdentifiersURN: urn:nbn:se:kth:diva-13435DOI: 10.1029/1999GL900599ISI: 000083677500008OAI: oai:DiVA.org:kth-13435DiVA: diva2:325330
QC 201006182010-06-182010-06-182012-08-14Bibliographically approved