Low altitude emission of ring current ENA’s spanning 1-100 keV as observed by IMAGE and TWINS: Select case studies

Details Low altitude emission of ring current ENA’s spanning 1-100 keV as observed by IMAGE and TWINS: Select case studies Low altitude emission of ring current ENA’s spanning 1-100 keV as observed by IMAGE and TWINS: Select case studies

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm11a1553m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM11A-1553

Physics

[0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [0394] Atmospheric Composition And Structure / Instruments And Techniques, [2716] Magnetospheric Physics / Energetic Particles: Precipitating

Scientific paper

Ring current ion precipitation during the main phase of geomagnetic storms plays a role in magnetosphere/ionosphere/thermosphere coupling. This precipitation can be a regionally dominant source of energy deposition and ionization in Earths’ upper atmosphere. Charge exchange between ring current ions spiraling into the high latitude upper atmosphere and terrestrial neutral constituents produces a non-isotropic distribution of escaping Energetic Neutral Atoms (ENA). ENA’s produced in such a manner are no longer tied to the magnetic field, and can therefore be observed remotely by orbiting platforms. Those ENAs emitted from altitudes of several hundred km at ring current and/or plasma sheet magnetic footpoints often form very bright signatures, and have been referred to as Low Altitude Emissions (LAE). In this study we will build on previous work in detecting LAE signatures in the IMAGE/MENA dataset. The algorithm used in the MENA study will be modified to detect LAE signatures in IMAGE/HENA and TWINS images over an energy range covering roughly 1-100 keV. The study will initially be limited to detections using hydrogen ENA’s, with the option to expand into oxygen in future work. The operational epochs of the IMAGE and TWINS platforms allow the opportunity to select interesting periods of geomagnetic activity over most of one solar cycle to use as case studies, focusing on the relationship of LAE’s to geomagnetic storms.

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