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Title: Inverse energy dispersion of energetic ions observed in the magnetosheath
Authors: Lee, S. H.
Sibeck, D. G.
Hwang, K. J.
Wang, Y.
Silveira, M. V. D.
Fok, M. C.
Mauk, B. H.
Cohen, I. J.
Ruohoniemi, J. M.
Kitamura, N.
Burch, J. L.
Giles, B. L.
Torbert, R. B.
Russell, C. T.
Lester, M.
First Published: 22-Jul-2016
Publisher: American Geophysical Union (AGU), Wiley
Citation: Geophysical Research Letters, 2016, 43 (14), pp. 7338-7347
Abstract: We present a case study of energetic ions observed by the Energetic Particle Detector (EPD) on the Magnetospheric Multiscale spacecraft in the magnetosheath just outside the subsolar magnetopause that occurred at 1000Â UT on 8 December 2015. As the magnetopause receded inward, the EPD observed a burst of energetic (∼50–1000Â keV) proton, helium, and oxygen ions that exhibited an inverse dispersion, with the lowest energy ions appearing first. The prolonged interval of fast antisunward flow observed in the magnetosheath and transient increases in the H components of global ground magnetograms demonstrate that the burst appeared at a time when the magnetosphere was rapidly compressed. We attribute the inverse energy dispersion to the leakage along reconnected magnetic field lines of betatron-accelerated energetic ions in the magnetosheath, and a burst of reconnection has an extent of about 1.5Â RE using combined Super Dual Auroral Radar Network radar and EPD observations.
DOI Link: 10.1002/2016GL069840
ISSN: 0094-8276
eISSN: 1944-8007
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: Archived with reference to SHERPA/RoMEO and publisher website.
Description: The Kp and Dst indices were provided by the website (
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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