Physics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29k..14i&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 11, pp. 14-1, CiteID 1519, DOI 10.1029/2001GL013847
Physics
16
Magnetospheric Physics: Auroral Phenomena (2407), Atmospheric Composition And Structure: Airglow And Aurora, Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Ring Current
Scientific paper
Recent global-scale observations by the IMAGE-FUV instrument demonstrate the existence of regions of particle precipitation at sub-auroral latitudes on the dayside. The signature of this precipitation is seen infrequently, but when so, it is clear in all 3 channels of the FUV instrument. A conjugate hemisphere conjunction with the FAST satellite demonstrates the presence of precipitating protons and the notable absence of precipitating electrons in these arcs. With this knowledge, one can determine the mean energy and energy flux of the precipitating protons by intercomparison of the response in the three FUV channels. Assuming that the protons have a kappa energy distribution, the mean energy is found to be ~20 keV, with a peak in total energy flux of ~1 mW/m2/sec, consistent with fits to the FAST ion measurements. These phenomena are observed mainly during times of high solar wind dynamic pressure and variable interplanetary magnetic field, and are associated with earlier nightside enhancements in the brightness and latitudinal extent of the proton aurora.
Burch James. L.
Carlson Charles W.
Frey Harald U.
Fuselier Stephen A.
Gérard Jean-Claude
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