Relation of sun-aligned arcs to polar cap convection and magnetic disturbances

Gusev, M.G.; Трошичев, О. А.

doi:10.1016/0032-0633(90)90002-8

Cited by 21 publications

(5 citation statements)

References 33 publications

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“…However, at the time of this DMSP pass, no arcs were detected in the IMAGE spacecraft UV image data. Another unique feature of the northward‐IMF ionosphere are bright discrete Sun‐aligned polar cap arcs detected from the ground [e.g., Gusev and Troshichev , 1990, and references therein]. Location of these arcs coincides with more faint and more global diffuse precipitation.…”

Section: Discussionmentioning

confidence: 99%

Plasma sheet structure during strongly northward IMF

et al. 2003

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[1] On 14 September 2001, under stongly northward IMF conditions Cluster registered several fast magnetic field polarity changes which are usually attributed to thin (nearequatorial) current sheet crossings. However, the IMF was northward for the previous 24 hours, the plasma sheet was expanded vertically, filled with cold, dense plasmas with high local vertical magnetic component B z , and the formation of a such cross-tail thin current sheet was very unlikely. The analysis of multipoint measurements revealed that the detected sheets were almost vertically oriented, had strong shear and vanishing normal magnetic components, and therefore could be interpreted as boundaries between independent magnetic field domains (flux tubes) vertically indented relative to their neighbors, rather than crossings of the main cross-tail current sheet. Such field reversals would be then observed by a spacecraft owing to horizontal flapping motion. Similar events were detected under analogous conditions by a pair of Geotail and Interball spacecraft, providing important evidence of significant spatial extent of areas with indented magnetic flux tubes along the tail. In conclusion we suggest how such anomalous structured magnetotail configuration might emerge in the course of high-latitude reconnection of geomagnetic lobe and northward IMF.

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Section: Discussionmentioning

confidence: 99%

Plasma sheet structure during strongly northward IMF

et al. 2003

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“…noted a polar cap arc newly forming during a substorm, appearing first at local midnight and lengthening sunward to noon. Gusev and Troshichev (1990) also detected a polar cap arc formed at the beginning of a substorm. According to Kullen et al (2002), TPAs typically fade some 10 s of minutes up to 1-2 hours after the onset of substorms.…”

Section: Connection With Substorm Triggeringmentioning

confidence: 92%

Aurora in the Polar Cap: A Review

et al. 2020

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This paper reviews our current understanding of auroral features that appear poleward of the main auroral oval within the polar cap, especially those that are known as Sunaligned arcs, transpolar arcs, or theta auroras. They tend to appear predominantly during periods of quiet geomagnetic activity or northwards directed interplanetary magnetic field (IMF). We also introduce polar rain aurora which has been considered as a phenomenon on open field lines. We describe the morphology of such auroras, their development and Auroral Physics Edited by 15 Page 2 of 44 K. Hosokawa et al.dynamics in response to solar wind-magnetosphere coupling processes, and the models that have been developed to explain them.

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“…The scanty spatial resolution of spacecraft UV imagers did not allow examining the fine structure of θ auroras and their relation to visible PCAs. However, there were some reasons to assume that visible PCAs are the most intense brightenings, appearing against the background of wider but less luminous transpolar bands that were observed by UV imagers (Gusev and Troshichev, 1990). Direct comparisons of visible PCAs observed by the all-sky camera at the Vostok station and θ auroras registered by the DE-1 UV imager were carried out for the first time by Vorobjev et al (1995b).…”

Section: Discrete Auroras In the Polar Capmentioning

confidence: 99%