Zhang_et_al-2016-Journal_of_Geophysical_Research%3A_Space_Physics.pdf (2.91 MB)
Polar cap patch transportation beyond the classic scenario
journal contribution
posted on 2018-05-08, 14:36 authored by Q-H. Zhang, J. Moen, M. Lockwood, I. McCrea, B-C. Zhang, K. A. McWilliams, Q-G. Zong, S-R. Zhang, J. M. Ruohoniemi, E. G. Thomas, M. W. Dunlop, R-Y. Liu, H-G. Yang, H-Q. Hu, Mark LesterWe report the continuous monitoring of a polar cap patch, encompassing its creation, and a subsequent evolution that differs from the classic behavior. The patch was formed from the stormenhanced density plume, by segmentation associated with a subauroral polarization stream generated by a substorm. Its initial antisunward motion was halted due to a rapidly changing of interplanetary magnetic field (IMF) conditions from strong southward to strong eastward with weaker northward components, and the patch subsequently very slowly evolved behind the duskside of a lobe reverse convection cell in afternoon sectors, associated with high-latitude lobe reconnection, much of it fading rapidly due to an enhancement of the ionization recombination rate. This differs from the classic scenario where polar cap patches are transported across the polar cap along the streamlines of twin-cell convection pattern from day to night. This observation provides us new important insights into patch formation and control by the IMF, which has to be taken into account in F region transport models and space weather forecasts.
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Citation
Journal of Geophysical Research: Space Physics, 2016, 121 (9), pp. 9063-9074Author affiliation
/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and AstronomyVersion
- VoR (Version of Record)
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Journal of Geophysical Research: Space PhysicsPublisher
American Geophysical Unionissn
2169-9380eissn
2169-9402Acceptance date
2016-08-22Copyright date
2016Available date
2018-05-08Publisher DOI
Publisher version
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2016JA022443Language
enAdministrator link
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Science & TechnologyPhysical SciencesAstronomy & Astrophysicspolar cap patchstorm-enhanced densitysubauroral polarization streammagnetosphere-ionosphere couplingpolar ionosphereEISCAT SVALBARD RADARMAGNETOPAUSE RECONNECTION RATEINTERPLANETARY MAGNETIC-FIELDPLASMA-DENSITY STRUCTURESIONOSPHERIC F-REGIONDAYSIDE CONVECTIONNETWORK SUPERDARNELECTRON-DENSITYSUBSTORM CYCLESIMF
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