| Title | Nighttime magnetic perturbation events observed in Arctic Canada: 2. multiple-instrument observations |
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| Author | Engebretson, M J; Steinmetz, E S; Posch, J L; Pilipenko, V A; Moldwin, M B; Connors, M G; Boteler, D H ; 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 |
| Source | Journal of Geophysical Research, Space Physics vol. 124, issue 9, 2019 p. 7459-7476, https://doi.org/10.1029/2019JA026797  Open Access |
| Image |  |
| Year | 2019 |
| Alt Series | Natural Resources Canada, Contribution Series 20190554 |
| Publisher | American Geophysical Union |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| Related | This publication is accompanied by Nighttime magnetic
perturbation events observed in Arctic Canada: 1. survey and statistical analysis |
| File format | pdf (Adobe® Reader®); html |
| Province | Nunavut; Quebec; Manitoba |
| NTS | 14; 15; 16; 24; 25; 26; 27; 28; 34; 35; 36; 37; 38; 44; 45; 46; 47; 48; 54; 55; 56; 57; 65; 66; 67 |
| Area | Canadian 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 |
| Subjects | geophysics; Science and Technology; Nature and Environment; geomagnetic fields; geomagnetism; geomagnetic variations; magnetic field; statistical analyses; magnetometer surveys; magnetic storms;
Infrastructures |
| Illustrations | location maps; tables; time series; geoscientific sketch maps; geophysical images |
| Program | Public Safety Geoscience Assessing space weather hazards |
| Released | 2019 08 29 |
| Abstract | The 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. |
| GEOSCAN ID | 321873 |
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