Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm14a..05v&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM14A-05
Physics
[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
The Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) mission provides a new capability for stereoscopically imaging the magnetosphere by observing energetic neutral atoms (ENA) produced by charge exchange over a broad energy range (~1-100 keV) using two identical imagers on two widely spaced high-altitude, high-inclination spacecraft. Owing to an extended solar minimum, the era of TWINS stereo operation (which began June 2008) has seen extremely quiet geomagnetic conditions, with very weak CIR-triggered disturbances (magnitude of Dst only a few tens of nT) occurring roughly every 27 days. On 22 July 2009 the Dst index fell to approximately -80 nT, the largest storm yet witnessed by TWINS and the largest disturbance since December 2006. TWINS made continuous ENA observations and stereoscopic ENA images from key times of this 22 July 2009 storm. We present here the TWINS observations from this storm and compare them to in situ observations (THEMIS) and model (CRCM) results.
C:son Brandt Pontus
Fok M. H.
Goldstein Jeffrey Jay
McComas David John
Perez Joseph D.
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