Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa23a1123r&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA23A-1123
Physics
0300 Atmospheric Composition And Structure, 2700 Magnetospheric Physics (6939), 3300 Atmospheric Processes, 7514 Energetic Particles (2114), 7900 Space Weather
Scientific paper
The FAST electron spectrometer offers a serendipitous opportunity to determine for the first time the fraction of precipitating photoelectrons that are backscattered. Ionospheric photoelectrons produced by solar EUV radiation can escape into the plasmasphere and travel along magnetic field lines to the opposite hemisphere. In 2002 the FAST satellite orbit sliced through the plasmasphere above 3000 km altitude where it detected photoelectrons coming from both hemispheres with energies in the range 10 to 800 eV. When one hemisphere is sunlit and the other is in darkness, the photoelectrons arriving at the satellite from the dark hemisphere are photoelectrons that are backscattered from the dark thermosphere after traveling from the sunlit hemisphere. This paper compares the measured and modeled backscattered fraction of photoelectrons. The backscatter ratio of precipitating electrons is important in relation to auroral energy deposition rate, which depends on the amount of backscattered energy flux. Direct experimental determination of auroral electron backscatter is not possible because the precipitating auroral flux is too variable in space and time.
Peterson B. K.
Richards Paul G.
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