Probing the Relationship Between EMIC Waves and Plasmaspheric Drainage Plumes near Geosynchronous Orbit

Details Probing the Relationship Between EMIC Waves and Plasmaspheric Drainage Plumes near Geosynchronous Orbit Probing the Relationship Between EMIC Waves and Plasmaspheric Drainage Plumes near Geosynchronous Orbit

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm33a..03p&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM33A-03

Physics

2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2774 Radiation Belts, 2778 Ring Current

Scientific paper

Plasmaspheric plumes created during disturbed geomagnetic conditions have been suggested as one cause of increased occurrences of electromagnetic ion cyclotron (EMIC) waves at these times. Murphy et al. [Fall AGU, 2008] cataloged all occurrences of Pc1 EMIC waves from 1996 through 2003 at three automated geophysical observatories (AGOs) at auroral zone latitudes in Antarctica (L = 6.28, 7.68, and 8.07; GLON = 20.4 W, 3.0 E, and 23.9 W). They found increased wave activity during the initial stages of convection during high speed streams, using data from 1996 and 2003, consistent with the observations [Borovsky and Denton, JGR, 2008; Denton and Borovsky, JGR, 2008] of increased density of plume material convecting to the dayside magnetopause at these times. In this study we further explore the correlation between the occurrence of Pc1 wave activity at these ground stations and the occurrence of plasmaspheric drainage plumes in space, using 1996-2002 data from the Magnetospheric Plasma Analyzer (MPA) on the LANL 1990-095 spacecraft, in geosynchronous orbit near 38 degrees west longitude.

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