Physics – Plasma Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1064k&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A5, pp. SMP 10-1, CiteID 1064, DOI 10.1029/2001JA000163
Physics
Plasma Physics
Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Space Plasma Physics: Charged Particle Motion And Acceleration, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Magnetosphere-Inner
Scientific paper
Kinetic modeling results are analyzed to examine the transport of photoelectrons through the nightside inner magnetosphere. Two sources are considered, those on the dayside from direct solar illumination and those across the nightside from light scattered by the upper atmosphere and geocorona. A natural filter exists on the nightside for the dayside photoelectrons. Coulomb collisions erode the distribution at low energies and low L shells, and magnetospheric convection compresses the electrons as they drift toward dawn. It is shown that for low-activity levels a band of photoelectrons forms between L = 4 and 6 that extends throughout the nightside local times and into the morning sector. For the scattered light photoelectrons the trapped zone throughout the nightside is populated with electrons of E < 30 eV. At high L shells near dawn, convective compression on the nightside yields an accelerated population with electrons at energies up to twice the ionospheric energy maximum (that is, roughly 1200 eV for dayside photoelectrons and 60 eV for scattered light electrons). Modeled energy and pitch angle distributions are presented to show the features of these populations.
Khazanov George V.
Liemohn Michael W.
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