Physics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3201106l&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 1, CiteID L01106
Physics
5
Ionosphere: Auroral Ionosphere (2704), Ionosphere: Ionospheric Dynamics, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Numerical Modeling
Scientific paper
Ionospheric electron heating by resonant standing shear Alfvén waves in Earth's magnetosphere is investigated. It is demonstrated that in field line resonances (FLRs), electron heating by Alfvén waves produces ionization and large changes in the ionospheric Pedersen conductivity. This leads to a strong feedback effect on the FLR amplitude, along with narrow localization in latitude. Analysis and computer simulations performed with a 2D finite element MHD code, indicate that the primary mechanisms responsible for variations in the electron temperature are ohmic heating by the electron component of the Pedersen current, and electron cooling due to ionization losses and collisions with neutrals. It is shown that electron heating can be quantitatively more important than direct collisional ionization by precipitating electrons. The latter can reduce dissipation losses by at most a factor of two.
Lu Jian-Yong
Marchand Régine
Rankin Robert
Tikhonchuk Vladimir T.
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