Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12b..07f&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM12B-07
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2439 Ionospheric Irregularities, 2455 Particle Precipitation, 2463 Plasma Convection, 2724 Magnetopause, Cusp, And Boundary Layers
Scientific paper
Observations during a triple magnetic conjunction CLUSTER-FAST-Sondestrom are examined. CLUSTER was on an outbound pass through the exterior cusp. The IMF pointed south-west throughout. A solar wind dynamic pressure release, whose arrival at CLUSTER can be very well timed, shifted CLUSTER into the cusp boundary layer at the poleward edge of the cusp (geomagnetic Bz < 0, Bx > 0). There it observed 5 flow bursts and magnetic perturbations which are Alfvenic in nature. We interpret these flow events as being due to a sequence of reconnected flux tubes passing over CLUSTER (i.e., flux transfer events, FTEs). This interpretation is further supported by (i) the observation at FAST of a staircase cusp signature on magnetic field lines nominally connected to CLUSTER; (ii) the observation by the Sondestrom and CUTLASS radars of a sequence of pulsed poleward enhancements of ionospheric flows (PIFs) which are (a) in one-to-one correspondence with the flow bursts at CLUSTER and which (b) are well known from previous work to be an ionospheric signature of FTEs; and (iii) Observations of the ion flow bursts at Polar, situated in the magnetosphere further downstream of CLUSTER, whose directional characteristics are consistent with the interpretation proposed above. The work extends previous studies of signatures of FTEs by showing flow bursts associated with reconnection at sub-cusp latitudes but which are seen behind the cusp. Acknowledgements: This work is supported by NASA Grants NAG 5-10883, NAG5 - 11803, NAG 5-11676, and NAS5-31283.
Balogh André
Carlson Carl
CERISIER J.
Cowley Stanley W.
Dunlop Malcolm W.
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