Using ENA Inversions with Simultaneous In-situ Measurements for Global 3-D Magnetospheric Perspective

Details Using ENA Inversions with Simultaneous In-situ Measurements for Global 3-D Magnetospheric Perspective Using ENA Inversions with Simultaneous In-situ Measurements for Global 3-D Magnetospheric Perspective

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51b2078v&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51B-2078

Physics

[1976] Informatics / Software Tools And Services, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [2794] Magnetospheric Physics / Instruments And Techniques

Scientific paper

In contrast to in situ measurements, Energetic Neutral Atom (ENA) imagery can provide information about very large portions of the Earth's magnetosphere (or other large scale space plasma systems) simultaneously. Two dimensional ENA images can be combined with an inversion to derive a fully three dimensional picture of magnetospheric plasma distributions. Although the spatial resolution of such a characterization is often much more course than in situ measurements, this type of measurement can yield unique insight into the global behavior of the plasma. In fact, a combined approach of in situ constellation measurements and ENA can be used to drastically reduce the inevitable time/space ambiguity incurred by in situ measurements. That is, given an understanding of the large scale motions and gradients afforded by the imagery, the ambiguity between spatial and temporal changes observed in situ (mitigated but not removed by constellation observations) can be effectively removed. We present here visualizations for the understanding of spatial and temporal phenomena in the magnetosphere through the use of 3-D particle distributions created from ENA inversions. We are using data from the HENA instrument which flew on NASA's IMAGE spacecraft (2000 to 2005). We present a tool for 3-D visualization of inverted ENA images, typically of the ring current region. So far, the tool provides access to a pre-made set of inversions that have been validated against multi-point, in-situ particle measurements made by detectors on Cluster or Polar. Eventually, the tool will allow users to request inversions for any usable time period within the IMAGE mission.

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