Ion Intensities from TWINS 1 & 2 ENA Images During Weak CIR Magnetic Storms

Details Ion Intensities from TWINS 1 & 2 ENA Images During Weak CIR Magnetic Storms Ion Intensities from TWINS 1 & 2 ENA Images During Weak CIR Magnetic Storms

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm71a..04p&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM71A-04

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2720 Energetic Particles: Trapped, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

The TWINS 1 & 2 energetic neutral atom (ENA) imagers have provided energy-dependent images for a series of weak (-30 to -50 nT minimum Dst) corotating interaction regions (CIRs) magnetic storms. The brightest pixels in the images are typically from low altitude emissions, that are due to charge exchange with neutral oxygen at altitudes of 500 - 1000 km. Mapping these pixels using the Tsyganenko magnetic field model from the ionosphere to the equator suggests that this emission is from plasma sheet particles. Using this and other features of the TWINS instruments along with techniques successfully used for ENA images from the IMAGE mission, we present ion intensities deconvolved from the neutral images. We show spatial and energy distributions of the ring current as a function of time during CIR storms in the summer of 2008.

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