Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm23b1700g&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM23B-1700
Physics
2736 Magnetosphere/Ionosphere Interactions (2431), 2764 Plasma Sheet, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Energetic neutral atom images (ENAs) from the IMAGE satellite have been used previously to observe features of the plasma sheet. From MENA images, McComas et al. [Geophys. Res. Lett., 29(22), 2079, doi:10.1029/2002GL016153, 2002.] showed that high flux from the plasma sheet is associated with high solar wind density. From HENA images, Brandt et al. [Geophys. Res. Lett., 29(20), 1954, doi:10.1029/2002GL015160, 2002] observed the acceleration of the plasma sheet ions during a substorm. We show here that the plasma sheet can also be observed from bright pixels in the ENA images that result from low altitude emissions caused by charge exchange of plasma sheet ions and ionospheric neutral oxygen. Magnetic field lines from these bright pixels are mapped into the plasma sheet using the Tsyganenko 2005 magnetic field model. Calculations using plasma sheet models, show that the observed flux is consistent with expectations. Thus we are able to observe plasma sheet properties during both CME and CIR geomagnetic storms inferred from geosynchronous observations by Borovsky and Denton [J. Geophys. Res., 111, A07S08, doi:10.1029/2005JA011447, 2006] For example, CME storms result in a plasma sheet that has a longer lasting, higher density, while CIR storms produce a longer lasting, hotter plasma sheet.
Grimes E. W.
Jahn J.-
Perez Joseph D.
Pollock C. J.
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