Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11612205l&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A12, CiteID A12205
Physics
Plasma Physics
2
Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Magnetospheric Physics: Radiation Belts, Radio Science: Waves In Plasma (7867), Space Plasma Physics: Wave/Particle Interactions (2483, 6984)
Scientific paper
The global distribution of chorus wave amplitudes and their wave normal angles is investigated using high-resolution wave spectra and waveform data from THEMIS for lower-band and upper-band chorus separately. Statistical results show that large amplitude chorus (>300 pT) occurs predominantly from premidnight to postdawn and is preferentially observed at lower L shells (<8) near the magnetic equator. However, strong or moderate chorus extends further into the afternoon sector and to higher L shells. For lower-band chorus, strong waves (>50 pT) tend to have wave normal angles of <20° and their wave normal angles become even smaller with increasing wave amplitudes. For modest waves, the wave normal angles are distributed over a broad range with a major peak at <20° and a secondary peak at 60°-80°. Wave normal angles of lower-band chorus are generally smaller on the dayside than on the nightside possibly due to the more uniform and more compressed magnetic field configuration on the dayside. Lower-band chorus becomes more oblique with increasing latitude on the dayside, whereas on the nightside the probability of observing oblique chorus decreases at higher latitudes. Compared to lower-band chorus, the properties of upper-band chorus are somewhat different. Upper-band chorus is considerably weaker in magnetic wave amplitudes, shows tighter confinement to the magnetic equator (<10°), and occurs at smaller L shells (<8). Furthermore, wave normal angles of upper-band chorus are generally larger than those of lower-band chorus, but the occurrence rate still peaks at wave normal angles of <20°, particularly for strong upper-band chorus.
Angelopoulos Vassilis
Bortnik Jacob
Li Wangrong
Mansergh Thorne Richard
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