Speaker
Dr
A. Vaivads
(Swedish Institute of Space Physics, Uppsala)
Description
The acceleration of energetic electrons inside magnetic pile-up regions
of plasma jets in the Earth
magnetotail is studied in details for one case observed by Cluster. The
case has been selected based
on high observed fluxes of electrons, Cluster being in the burst mode
and Cluster separation being
around 1000 km that is optimal for studies of ion scale physics. We
show that during this event
there are present two characteristic acceleration mechanisms. First,
significant acceleration is
achieved due to magnetic flux pile-up, consistent with betatron
acceleration. Secondly, in this case
magnetic island like 3D structures are forming in front of the pile-up
region and we observe strong
electron acceleration inside those. Energetic electrons inside magnetic
island have more parallel
anisotropy and thus can escape along the magnetic field from the
acceleration place and can
generate low altitude radio emissions as observed.
Primary author
Dr
A. Vaivads
(Swedish Institute of Space Physics, Uppsala)
Co-authors
Dr
A. Retinò
(Laboratoire de Physique des Plasmas LPP, Centre National de la Recherche Scientifique CNRS, France)
Dr
E. Kronberg
(Max-Planck-Institut fr Sonnensystemforschung, Katlenburg-Lindau, Germany)
Prof.
H. Fu
(Space Science Institute, School of Astronautics, Beihang University, Beijing, China)
Prof.
P. Daly
(Max-Planck-Institut fr Sonnensystemforschung, Katlenburg-Lindau, Germany)
Dr
Yu. V. Khotyaintsev
(Swedish Institute of Space Physics, Uppsala)
