GEOSCAN Search Results: Fastlink


TitleNighttime magnetic perturbation events observed in Arctic Canada: 2. multiple-instrument observations
AuthorEngebretson, M J; Steinmetz, E S; Posch, J L; Pilipenko, V A; Moldwin, M B; Connors, M G; Boteler, D HORCID logo; Mann, I R; Hartinger, M D; Weygand, J M; Lyons, L R; Nishimura, Y; Singer, H J; Ohtani, S; Russell, C T; Fazakerley, A; Kistler, L M
SourceJournal of Geophysical Research, Space Physics vol. 124, issue 9, 2019 p. 7459-7476, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20190554
PublisherAmerican Geophysical Union
Mediapaper; on-line; digital
RelatedThis publication is accompanied by Nighttime magnetic perturbation events observed in Arctic Canada: 1. survey and statistical analysis
File formatpdf (Adobe® Reader®); html
ProvinceNunavut; Quebec; Manitoba
NTS14; 15; 16; 24; 25; 26; 27; 28; 34; 35; 36; 37; 38; 44; 45; 46; 47; 48; 54; 55; 56; 57; 65; 66; 67
AreaCanadian Arctic; Baffin Island; Melville Peninsula; Ungava Peninsula; Hudson Bay; Repulse Bay; Rankin Inlet; Churchill; Cape Dorset; Pangnirtung; Igloolik; Belcher Islands; Canada; Greenland; Denmark
Lat/Long WENS-100.0000 -48.0000 74.0000 56.0000
Subjectsgeophysics; Science and Technology; Nature and Environment; geomagnetic fields; geomagnetism; geomagnetic variations; magnetic field; statistical analyses; magnetometer surveys; magnetic storms; Infrastructures
Illustrationslocation maps; tables; time series; geoscientific sketch maps; geophysical images
ProgramPublic Safety Geoscience Assessing space weather hazards
Released2019 08 29
AbstractThe rapid changes of magnetic fields associated with nighttime magnetic perturbations with amplitudes |delta-B| of hundreds of nanoteslas and 5- to 10-min periods can induce bursts of geomagnetically induced currents that can harm technological systems. This paper presents three cases of intervals of intense and complex nighttime magnetic perturbations in eastern Arctic Canada in 2015, augmented by observations from auroral imagers and high-altitude spacecraft in the nightside magnetosphere. Each case occurred within 1 hr after substorm onsets. None occurred during the main phase of a geomagnetic storm, and only the first during the early recovery phase (of a moderate storm). The cases were similar in that two or three intervals occurred in this region over a span of ~1 hr; these showed a spatial progression, in that successive intervals occurred later at more western and northern stations. During several intervals, individual peak Bx impulses occurred nearly simultaneously (within 1-2 min) at several stations, while during others the impulses occurred later at more western and northern stations, and during one interval they occurred later at southern stations. During both of the cases for which auroral images were available, a westward traveling surge and a poleward auroral expansion and/or poleward boundary intensification occurred, and during two events auroral streamers coincided in time and location with magnetic perturbations. These observations appear to be consistent with several earlier studies connecting nighttime magnetic perturbation events to localized auroral structures and to dipolarizing flux bundles and bursty bulk flows in the magnetotail.

Date modified: