Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 120, Issue 7, Pages 5623-5632Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015JA021074
Keywords
electron acceleration; kinetic Alfven waves; kinetic simulations; magnetosphere-ionosphere coupling; ion gyroradius effects
Categories
Funding
- NASA [NNH11AR071, NNX14AM27G, NNH14AY20I, NNX13XAE12G, NNX15AJ01G]
- NSF [AGS1203299]
- Australian Research Council [FT110100316]
- U.S. Department of Energy [DE-AC02-09CH11466]
- CISL project [UPR10002]
- NASA [NNX14AM27G, 679191] Funding Source: Federal RePORTER
- Australian Research Council [FT110100316] Funding Source: Australian Research Council
- Direct For Mathematical & Physical Scien
- Division Of Physics [1523261] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1144374] Funding Source: National Science Foundation
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A new 2-D self-consistent hybrid gyrofluid-kinetic electron model in dipolar coordinates is presented and used to simulate dispersive-scale Alfven wave pulse propagation from the equator to the ionosphere along an L = 10 magnetic field line. The model is an extension of the hybrid MHD-kinetic electron model that incorporates ion Larmor radius corrections via the kinetic fluid model of Cheng and Johnson (1999). It is found that consideration of a realistic ion to electron temperature ratio decreases the propagation time of the wave from the plasma sheet to the ionosphere by several seconds relative to a (i)=0 case (which also implies shorter timing for a substorm onset signal) and leads to significant dispersion of wave energy perpendicular to the ambient magnetic field. Additionally, ion temperature effects reduce the parallel current and electron energization all along the field line for the same magnitude perpendicular electric field perturbation.
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