Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53b1385g&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM53B-1385
Physics
[2768] Magnetospheric Physics / Plasmasphere, [2772] Magnetospheric Physics / Plasma Waves And Instabilities
Scientific paper
In this study, we investigate the role of the plasmapause shape and extent, as determined by the IMAGE satellite's EUV imager, in dictating the type and amplitude of ELF/VLF chorus and hiss emissions observed at the Stanford recording station in Palmer Station, Antarctica. Palmer Station, situated at the tip of the Antarctic peninsula at L=2.4, observes magnetospherically-generated chorus and hiss emissions on more than 50% of days during years of high solar activity (e.g., 2003, near the peak of the most recent solar cycle). It has been well-established that increased geomagnetic disturbance, as measured by increased values of Kp, leads to increased observation of chorus and hiss on the ground, as well as in space. Similarly, increased geomagnetic disturbance leads to the erosion of the plasmasphere as shown, for example, in the Carpenter-Anderson 1992 plasmasphere model. However, the effects of the specific instantaneous plasmapause shape and extent on chorus and hiss occurrence are less well-known. This study attempts to determine and explain specifically the effects of the plasmapause on chorus and hiss emissions observed at Palmer. Specifically, we show the importance of large scale structures of the plasmapause on determining characteristics of emissions observed at Palmer, and how estimating the plasmapause at a given geomagnetic longitude from the global Kp index is often a severe oversimplification. Additionally, we discuss the question of whether the instantaneous large-scale structures in the plasmapause are an underlying cause of the variation in chorus and hiss occurrence at Palmer (e.g., if the eroded plasmapause more effectively guides emissions to the ground), or whether both phenomena are effects of a greater overlying cause.
Golden D. I.
Inan Umran S.
Spasojevic Maria
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