OBLIQUE LOWER BAND CHORUS WAVES AND TRANSVERSE MOTION OF THE CHORUS SOURCE

Details OBLIQUE LOWER BAND CHORUS WAVES AND TRANSVERSE MOTION OF THE CHORUS SOURCE OBLIQUE LOWER BAND CHORUS WAVES AND TRANSVERSE MOTION OF THE CHORUS SOURCE

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53b1383c&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM53B-1383

Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

We report observations and analysis of highly oblique lower band chorus emissions recorded by WBD and STAFF instruments onboard CLUSTER spacecraft close to the geomagnetic equator. We observed falling elements in the analyzed cases. The Poynting flux measurements made by the STAFF instrument confirm that the chorus source is located in the magnetic equatorial plane. Owing to the orbit, the spacecraft located closer to the equator were at lower L-shells during these observations. Surprisingly, the spacecraft located closer to the geomagnetic equator systematically received the corresponding chorus elements later than the spacecraft located at higher magnetic latitudes. The time shifts and frequency differences depended almost linearly on the perpendicular distance between the various spacecraft. We discuss several properties of the chorus source that could lead to these observations. We show that the sources moving across the magnetic field lines are reasonably well consistent with these observations. We propose that the transverse motion of the chorus sources is a consequence of a feedback between the oblique waves and counter streaming electrons during nonlinear cyclotron interactions, and we provide an estimate of the transverse velocity of the source.

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