Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm53d..02t&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM53D-02
Other
2435 Ionospheric Disturbances, 2451 Particle Acceleration, 2704 Auroral Phenomena (2407), 2721 Field-Aligned Currents And Current Systems (2409)
Scientific paper
Excitation of ULF waves due to the positive feedback instability is considered in Ionospheric Alfvén Resonator (IAR) taking into account an inhomogeneous profile of velocity of the magnetospheric convection. This profile is formed by interaction of the convective flow with the neutral atmosphere at heights 90--150~km. ULF waves include oblique Alfvén waves, trapped in IAR, and drift ionospheric waves, which are in a resonance with each other. These waves together form strongly anisotropic closed current loops with the scale along the magnetic field l\| ~ 1000~km and with the scale l\perp ~ 1~km across the magnetic field and can be considered as Alfvén vortices. The instability threshold and the growth rate are investigated as functions of different parameters (wave vector k\perp, angle between the wave vector and convection velocity, ratio of Alfvén wave and Pedersen conductivities) in a model of ionosphere close to the real one. Possible acceleration mechanisms of electrons by oblique Alfvén waves and the role of energetic electron precipitation in the feedback instability development are discussed. Some estimations are given in application to observed short-scale field- aligned currents and auroral arcs in the auroral ionosphere.
No associations
LandOfFree
Excitation of Alfven vortices in the ionosphere by the magnetospheric convection does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Excitation of Alfven vortices in the ionosphere by the magnetospheric convection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Excitation of Alfven vortices in the ionosphere by the magnetospheric convection will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1427144