Physics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3708107w&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 8, CiteID L08107
Physics
1
Magnetospheric Physics: Substorms, Interplanetary Physics: Energetic Particles (7514), Magnetospheric Physics: Ring Current
Scientific paper
We present imaging and high resolution energy spectra of energetic ˜5-90 keV neutral atoms (ENA) of a weak geomagnetic substorm (Dst > -8 nT and AE $\lesssim$ 200 nT), made by the Suprathermal Electron (STE) instrument on the STEREO B spacecraft. Enhanced ENA emissions were observed coming from around local midnight near the equator with different spatial distribution and/or temporal behavior at ˜5-20keV compared to ˜20-90 keV. By forward modeling using a parameterized ring-current model, we show that the ENA images imply the parent equatorial protons have pitch-angle distributions peaked at 90°, an energy spectrum consistent with in situ proton measurements at geosynchronous orbit, and a spatial asymmetry with the maximum flux at midnight for 5-20 keV and at 2240 MLT for 20-90 keV. These are the first ENA measurements at ˜5 to 26 keV from low altitude, and the first for such weak activity.
C:son Brandt Pontus
Curtis Dave W.
Eastwood Jonathan P.
Larson Davin E.
Lin Robert P.
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