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CUTLASS HF radar observations of high-latitude azimuthally propagating vortical currents in the nightside ionosphere during magnetospheric substorms

CUTLASS HF radar observations of high-latitude azimuthally propagating vortical currents in the... High-time resolution CUTLASS observations and ground-based magnetometers have been employed to study the occurrence of vortical flow structures propagating through the high-latitude ionosphere during magnetospheric substorms. Fast-moving flow vortices (∼800 m s−1) associated with Hall currents flowing around upward directed field-aligned currents are frequently observed propagating at high speed (∼1 km s−1) azimuthally away from the region of the ionosphere associated with the location of the substorm expansion phase onset. Furthermore, a statistical analysis drawn from over 1000 h of high-time resolution, nightside radar data has enabled the characterisation of the bulk properties of these vortical flow systems. Their occurrence with respect to substorm phase has been investigated and a possible generation mechanism has been suggested. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annales Geophysicae Springer Journals

CUTLASS HF radar observations of high-latitude azimuthally propagating vortical currents in the nightside ionosphere during magnetospheric substorms

Wild, J.; Yeoman, T.
Annales Geophysicae , Volume 18 (6) – Jan 1, 2000
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13 pages

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Publisher
Springer Journals
Copyright
Copyright © 2000 by EGS – Springer-Verlag
Subject
Earth Sciences; Geophysics/Geodesy; Astronomy, Observations and Techniques; Astrophysics and Astroparticles; Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics)
ISSN
0992-7689
eISSN
1432-0576
DOI
10.1007/s00585-000-0640-7
Publisher site
See Article on Publisher Site

Abstract

High-time resolution CUTLASS observations and ground-based magnetometers have been employed to study the occurrence of vortical flow structures propagating through the high-latitude ionosphere during magnetospheric substorms. Fast-moving flow vortices (∼800 m s−1) associated with Hall currents flowing around upward directed field-aligned currents are frequently observed propagating at high speed (∼1 km s−1) azimuthally away from the region of the ionosphere associated with the location of the substorm expansion phase onset. Furthermore, a statistical analysis drawn from over 1000 h of high-time resolution, nightside radar data has enabled the characterisation of the bulk properties of these vortical flow systems. Their occurrence with respect to substorm phase has been investigated and a possible generation mechanism has been suggested.

Journal

Annales Geophysicae – Springer Journals

Published: Jan 1, 2000

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