Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51b2076p&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM51B-2076
Physics
[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2778] Magnetospheric Physics / Ring Current
Scientific paper
The spatial and temporal variations of the energy spectra of trapped ring current ions is an important geospace diagnostic during geomagnetic storms. The stereo energetic neutral atom (ENA) images provided by the TWINS dual-space mission offer a unique view of the spatial and temporal variations of the inner magnetosphere during these storms. We present ion energy spectra from 2.5 - 90 keV deconvolved from ENA images for a number of geomagnetic storms during the time period 2008-11. These include both ICME and CIR driven storms. The spectra are fit to a kappa and/or a Maxwellilan distribution to obtain density and temperature profiles. For energies below 30 keV, the distributions are usually Maxwellian-like but for higher energies show a higher than Maxwellian tail. The results are compared with in-situ measurements from THEMIS when available.
Angelopoulos Vassilis
Blumenthal A.
Goldstein Jeffrey Jay
Grimes E. W.
Lauritson E.
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