Ion-beam-driven intense electrostatic solitary waves in reconnection jet

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Liu , C M , Vaivads , A , Graham , D B , Khotyaintsev , Y V , Fu , H S , Johlander , A , André , M & Giles , B L 2019 , ' Ion-beam-driven intense electrostatic solitary waves in reconnection jet ' , Geophysical Research Letters , vol. 46 , no. 22 , pp. 12702-12710 . https://doi.org/10.1029/2019GL085419

Title: Ion-beam-driven intense electrostatic solitary waves in reconnection jet
Author: Liu, C.M.; Vaivads, A.; Graham, D.B.; Khotyaintsev, Yu V.; Fu, H.S.; Johlander, A.; André, M.; Giles, B.L.
Other contributor: University of Helsinki, Particle Physics and Astrophysics


Date: 2019-11-28
Language: eng
Number of pages: 9
Belongs to series: Geophysical Research Letters
ISSN: 0094-8276
DOI: https://doi.org/10.1029/2019GL085419
URI: http://hdl.handle.net/10138/311882
Abstract: Electrostatic solitary waves (ESWs) have been reported inside reconnection jets, but their source and role remain unclear hitherto. Here we present the first observational evidence of ESWs generation by cold ion beams inside the jet, by using high-cadence measurements from the Magnetospheric Multiscale spacecraft in the Earth's magnetotail. Inside the jet, intense ESWs with amplitude up to 30 mV m(-1) and potential up to similar to 7% of the electron temperature are observed in association with accelerated cold ion beams. Instability analysis shows that the ion beams are unstable, providing free energy for the ESWs. The waves are observed to thermalize the beams, thus providing a new channel for ion heating inside the jet. Our study suggests that electrostatic turbulence can play an important role in the jet dynamics.
Subject: ACCELERATION
ANISOTROPY
BURSTY BULK FLOWS
DIPOLARIZATION FRONTS
ENERGY-CONVERSION
ONSET
PARTICLE ENERGIZATION
ROLLING-PIN DISTRIBUTION
SEPARATRIX REGION
TAIL
dipolarization front
electrostatic solitary waves
ion beam instability
ion heating
reconnection jet
wave-particle interations
114 Physical sciences
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