Ion Acceleration in Vlasov Simulations of Double Layers, Electron Holes, and Associated Waves in Earth's Auroral Ionosphere

Details Ion Acceleration in Vlasov Simulations of Double Layers, Electron Holes, and Associated Waves in Earth's Auroral Ionosphere Ion Acceleration in Vlasov Simulations of Double Layers, Electron Holes, and Associated Waves in Earth's Auroral Ionosphere

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm51d..04s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM51D-04

Physics

7815 Electrostatic Structures, 7839 Nonlinear Phenomena (4400, 6944), 7845 Particle Acceleration, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

The localized unipolar electric field of strong double layers (DLs), such as those observed1 by FAST in the downward current region of the auroral ionosphere, can produce significant acceleration of anti-earthward electrons and earthward ions. However, DLs can also contribute to the energization of ion perpendicular to the geomagnetic field through several different processes: If the DL itself develops structure perpendicular to \mathbf{B}0, strong local ion heating can result. On the high-potential (high-altitude) side of the DL, electron holes (nonlinear structures with bipolar electric fields resulting from the saturation of a DL-driven electron two-stream instability) can also contribute to the acceleration of ions \perp to \mathbf{B}0. Finally, oblique wave modes with E\perp\gg Eallel (e.g., lower-hybrid and ion-Bernstein waves) can contribute to perpendicular ion heating both above and below the DL. Two-dimensional Vlasov simulations are employed to study the interactions of DLs, holes, and oblique waves, together with their contributions to perpendicular ion heating rates. Fully kinetic algorithms for unmagnetized ions as well as reduced2 algorithms for magnetized ions, are used in this study. *Research supported by NASA, NSF, and DOE 1 R.~E.~Ergun, et al., Phys.~Rev.~Lett., 87, 045003 (2001). 2 D.~L.~Newman, et al., Phys.~Plasmas, 14, 055907 (2007).

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