Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm14b..03l&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM14B-03
Physics
Plasma Physics
[7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
A number of recent studies have revealed a close association between the fast earthward flows and dipolarization fronts in the magnetotail and the plasma wave intensifications in the ELF/VLF range, including the lower-hybrid waves, whistler-mode and electron cyclotron waves. Those waves may play crucial roles in the acceleration and pitch-angle scattering of the plasma sheet electrons, and in turn produce a macroscopic effect accompanying the fast flows. In this study, we perform a statistical survey of the THEMIS B/C data over the 2008 and 2009 tail seasons, and select ~110 fast earthward flow intervals in which the probes were mostly located in the mid-tail central plasma sheet (CPS) region. We investigate the filterbank (FBK) dataset of the electric field instrument (EFI) and search coil magnetometer (SCM) during the collected fast flow intervals, and identify an unambiguous trend of increasing ELF wave intensities with the convective flow enhancement. Notwithstanding the relatively wide bandwidth of FBK data we may still distinguish the existence of the lower-hybrid waves, the whistler-mode waves, and the electrostatic waves at f>f_ce. On a further examining of the flow-associated whistler-mode waves we notice a mixture of the quasi-electrostatic and electromagnetic wave modes, implying a broad distribution of the wave normal angles. We tentatively suggest that the energetic electron beam originated from the reconnection site and/or the local dipolarizatoin front might be the main driving mechanism of the flow-associated ELF wave intensifications.
Cully C. M.
Donovan Eric F.
Liang Jian-Jie
Mansergh Thorne Richard
Ni Binbin
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