Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - CUTLASS HF radar observations of high-latitude azimuthally propagating vortical currents in the nightside ionosphere during magnetospheric substorms
AU - Wild, J. A.
AU - Yeoman, T. K.
PY - 2000/6
Y1 - 2000/6
N2 - High-time resolution CUTLASS observations and ground-based magnetometers have been employed to study the occurrence of vortical fl ̄ow structures propagating through the high-latitude ionosphere during magnetospheric substorms. Fast-moving flow vortices (~800 m/s) associated with Hall currents flowing around upward directed field-aligned currents are frequently observed propagating at high speed (~1 km/s) 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.
AB - High-time resolution CUTLASS observations and ground-based magnetometers have been employed to study the occurrence of vortical fl ̄ow structures propagating through the high-latitude ionosphere during magnetospheric substorms. Fast-moving flow vortices (~800 m/s) associated with Hall currents flowing around upward directed field-aligned currents are frequently observed propagating at high speed (~1 km/s) 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.
KW - magnetometer DCS-publications-id
KW - art-516
KW - DCS-publications-credits
KW - samnet
KW - DCS-publications-personnel-id
KW - 104
U2 - 10.1007/s00585-000-0640-7
DO - 10.1007/s00585-000-0640-7
M3 - Journal article
VL - 18
SP - 640
EP - 652
JO - Annales Geophysicae
JF - Annales Geophysicae
SN - 0992-7689
IS - 6
ER -