Simulation studies of electron phase-space hole dynamics in the auroral ionosphere

Details Simulation studies of electron phase-space hole dynamics in the auroral ionosphere Simulation studies of electron phase-space hole dynamics in the auroral ionosphere

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm41b07o&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM41B-07

Physics

2407 Auroral Ionosphere (2704), 2471 Plasma Waves And Instabilities, 2483 Wave/Particle Interactions

Scientific paper

Bipolar electric field structures have recently been identified in four different regions of the Earth's ionosphere and magnetosphere. We now understand that these field structures result from the electric field signature of electron phase-space holes -- quasi-stable regions of depleted electron density commonly generated during the nonlinear stage of the two-stream instability. Massively-parallel PIC simulations in 2-D and 3-D show that these holes decay after hundreds of plasma periods while emitting electrostatic whistler waves (magnetized Langmuir waves oblique to the geomagnetic field ěc B0). Ultimately, these holes break up into small structures having comparable sizes parallel and perpendicular to ěc B0. Recently, two theories have been proposed to explain the generation of whistler waves by electron holes. This paper presents a number of simulations which helps us discern between the theories and the role they play in hole physics. This analysis should help us better understand the evolution of electron holes found in the downward current region of the auroral ionosphere.

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