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Abstract
In this study, the ion composition of flux transfer events (FTEs) observed within the magnetosheath proper is examined. These FTEs were observed just upstream of the Earth's postnoon magnetopause by the National Aeronautics and Space Administration (NASA) Magnetospheric Multiscale (MMS) spacecraft constellation. The minor ion characteristics are described using energy spectrograms, flux distributions, and ion moments as the constellation encountered each FTE. In conjunction with electron data and magnetic field observations, such observations provide important contextual information on the formation, topologies, and evolution of FTEs. In particular, minor ions, when combined with the field-aligned streaming of electrons, are reliable indicators of FTE topology. The observations are also placed (i) in context of the solar wind magnetic field configuration, (ii) the connection of the sampled flux tube to the ionosphere, and (iii) the location relative to the modeled reconnection line at the magnetopause. While protons and alpha particles were often depleted within the FTEs relative to the surrounding magnetosheath plasma, the He+ and O+ populations showed clear enhancements either near the center or near the edges of the FTE, and the bulk plasma flow directions are consistent with magnetic reconnection northward of the spacecraft and convection from the dayside toward the flank magnetopause.
Publication Date
6-14-2020
Journal Title
JGR: Space Physics
Publisher
AGU
Digital Object Identifier (DOI)
Document Type
Article
Recommended Citation
Petrinec, S. M.; Burch, J. L.; Chandler, M.; Farrugia, C. J.; Fuselier, S. A.; Giles, B. L.; Gomez, R. G.; Mukherjee, J.; Paterson, W. R.; Russell, C. T.; Sibeck, D. G.; Strangeway, R. J.; Torbert, R. B.; Trattner, K. J.; Vines, S. K.; Zhao, C. (2020). Characteristics of Minor Ions and Electrons in Flux Transfer Events Observed by the Magnetospheric Multiscale Mission, JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS. Vol. 125, No. 7. DOI: 10.1029/2020JA027778
Comments
This is an article published by AGU in JGR: Space Physics in 2020, available online: https://dx.doi.org/10.1029/2020JA027778