Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1706g&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1706
Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2768] Magnetospheric Physics / Plasmasphere, [2772] Magnetospheric Physics / Plasma Waves And Instabilities
Scientific paper
This study explores the manner in which the plasmapause is responsible for dictating which magnetospheric source regions of ELF/VLF chorus are able to propagate to and be received by mid-latitude stations on the ground. First, we explore the effects of plasmapause extent on ground-based observations of chorus via a three-month study of ground-based measurements of chorus at Palmer Station, Antarctica (L=2.4, 50°S geomagnetic latitude) and data on the plasmapause extent from the IMAGE EUV instrument. It is found that chorus normalized occurrence peaks when the plasmapause is at L ~ 2.6, somewhat higher than Palmer's L-shell, and that this occurrence peak persists across a range of observed chorus frequencies. Next, reverse raytracing is employed to evaluate the portion of the equatorial chorus source region, distributed in radial distance and wave normal, from which chorus is able to reach Palmer station via propagation in a non-ducted mode. The results of raytracing are similar to those of observations, with a peak of expected occurrence when the plasmapause is at L ~ 3. The exact location of the peak is frequency-dependent. This supports the conclusion that the ability for chorus to propagate to low altitudes and the ground is a strong function of instantaneous plasmapause extent, and that peak occurrence of chorus at a given ground station may occur when the L-shell of the plasmapause is somewhat beyond that of the observing station. These results also suggest that chorus observed on the ground at mid-latitude stations propagates predominantly in the non-ducted mode.
Golden D. I.
Inan Umran S.
Spasojevic Maria
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