Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm13d..06r&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM13D-06
Physics
2720 Energetic Particles: Trapped, 2724 Magnetopause And Boundary Layers, 2728 Magnetosheath, 2748 Magnetotail Boundary Layers, 2778 Ring Current
Scientific paper
On May 20, 2007, the 5 THEMIS spacecraft passed by a FTE, in the post-noon sector. Spacecraft configuration was particularly interesting since the satellites bracketed the FTE structure, with Thb and Thc on the magnetospheric side, Tha and The on the magnetosheath side, while Thd was close to the magnetopause current layer. The geometry and the general characteristics of this event will be discussed elsewhere by Sibeck et al. Here we look for possible wave-particle interactions. The spacecraft in the magnetosphere observe (i) a bipolar magnetic field signature normal to the nominal magnetopause, (ii) a crater-like variation in the magnetic field strength, (iii) enhanced densities, (iv) enhanced ion flow velocities, (v) intense fluxes of medium energy electrons, and (vi) enhanced magnetic components of the ULF waves. Densities and ion velocities in the core region are comparable to those in the magnetosheath, but electrons are apparently heated/accelerated well above magnetosheath values. Near the magnetopause, and in the magnetosheath, electron heating/acceleration is not limited to the vicinity of the FTE magnetic field signature, but rather extends over a broader region, where it still coincides with ULF waves. Densities and ion flow velocities vary little as the FTE passes the spacecraft in the magnetosheath. However, in conjunction with large amplitude ULF waves, the magnetosheath electrons are heated/accelerated significantly These preliminary observations suggest that electromagnetic waves interact with electrons, inside the FTE, on the magnetospheric side, and in a broader region, in the current layer and magnetosheath side. We will analyse wave characteristics, as well as the shape of the electron distribution function, and investigate possible signatures of wave particle interactions as a potential heating mechanism.
Alison D.
Angelopoulos Vassilis
Auster Uli
Bonnell Jerry
Bouabdellah A.
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