Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1713h&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1713
Physics
[2768] Magnetospheric Physics / Plasmasphere, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
Electromagnetic ion cyclotron (EMIC) waves have been observed to occur more frequently during geomagnetic storms as well as in the days following the minimum Sym-H value and are thought to contribute to the loss processes of the ring current ion and radiation belt MeV electrons. In particular, CRRES EMIC wave activity shows peaks in occurrence during the storm main phase, and again after about 4 - 6 days from the minimum Sym-H value. It is well known that EMIC wave generation is enhanced in the presence of increased cold plasma density associated with radially extended plasmaspheric plasma plumes and the refilling of the plasmasphere. The hot plasma, which is also needed in the generation of the EMIC waves, can be provided by the storm time ring current or potentially through substorm particle injections. It has been suggested that the density structures and plumes formed during geomagnetic storms in the plasmasphere are also important in the generation and propagation of EMIC waves. In this study we will report on the role of the plasmasphere in influencing the distribution of EMIC waves seen during the storm main and recovery phases, as well as during the 6 days following the minimum Sym-H value of the storm. The EMIC wave data set used comes from the CRRES mission that includes over 800 EMIC wave events and over 100 geomagnetic storms. By comparing the main and recovery phases between storms and the phases to each other and to quiet times, we are able to improve our understanding of what magnetospheric and plasma conditions are prevalent during EMIC wave events. We can also better define the role of the hot,ring current and cold plasmspheric plasma in EMIC wave generation by looking at how the EMIC waves are associated with ring current injections and plasmaspheric plumes.
Fraser Brian J.
Halford A. J.
Morley S.
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