@article{fb43bac7b54b492ea02d1bb7b269e47c,
title = "Ion Energization by Turbulent Electric Fields in Fast Earthward Flows and Its Implications for the Dynamics of the Inner Magnetosphere",
abstract = "Large-amplitude electric fields (>50 mV/m) typical to bursty bulk flow (BBF) braking regions of the Earth's magnetotail can accelerate energetic electrons and ions to many times their initial thermal energies. We follow up on the Usanova and Ergun (2022), https://doi.org/10.1029/2022JA030336, study of electron energization and examine wave and plasma observations from the THEMIS satellites over four tail seasons to investigate the transfer of BBF energy to ions by turbulent electric fields. The results show that the large-amplitude electric fields are accompanied by an ion temperature increase of ∼50% when compared to times when the turbulence is not observed. Electric field turbulence is also associated with a roughly ten-fold increase in temperature fluctuations and a five-fold increase in variations of energetic ion fluxes. We discuss the contribution of this turbulent energy transfer process to the dynamics of energetic ions in the magnetosphere.",
keywords = "BBF breaking region, fast earthward flows, ion energization, large-amplitude electric fields, turbulence",
author = "Usanova, {M. E.} and Ergun, {Robert E.} and Stawarz, {J. E.}",
note = "Funding information: This work is supported by NASA grants for THEMIS mission and funding support from the MMS and Van Allen Probes missions. We acknowledge NASA contract NAS5-02099 and V. Angelopoulos for use of data from the THEMIS Mission. Specifically, J. W. Bonnell and F. S. Mozer for use of EFI data, D. Larson and the late R. P. Lin for use of SST data, C. W. Carlson and J. P. McFadden for use of ESA data, K. H. Glassmeier, U. Auster and W. Baumjohann for the use of FGM data provided under the lead of the Technical University of Braunschweig and with financial support through the German Ministry for Economy and Technology and the German Center for Aviation and Space (DLR) under contract 50 OC 0302. We thank World Data Center for Geomagnetism, Kyoto for the use of Dst data. MEU is thankful for support from the International Space Sciences Institute international teams program and NASA award 80NSSC23K0405. JES is supported by the Royal Society University Research Fellowship URF\R1\201286.",
year = "2023",
month = aug,
doi = "10.1029/2023JA031704",
language = "English",
volume = "128",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9380",
publisher = "American Geophysical Union",
number = "8",
}