Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm23a1191o&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM23A-1191
Physics
2704 Auroral Phenomena (2407), 2716 Energetic Particles: Precipitating, 2723 Magnetic Reconnection (7526, 7835), 2736 Magnetosphere/Ionosphere Interactions (2431), 2744 Magnetotail
Scientific paper
In a recent case study based on the combined Cluster and Polar PIXIE data we reported that an inverted-V structure caused by a field aligned potential drop of 30 kV producing very strong X-ray aurora was found in connection with tail reconnection. However, the insitu particle measurements by Cluster indicate clearly that the particles responsible for the X-ray aurora were not accelerated by the reconection process. In this paper we report predicted and observed ionospheric signatures of 13 reconnection events where Cluster passed through the reconnection ion diffusion region. For the 6 events where global auroral imaging data were available our results indicate that reconnection is an azimuthally expanding (or extended) process observed along the poleward boundary of the aurora. Furthermore, the ionospheric emissions indicate that there has to be acceleration mechanism in addition to the local acceleration in the ion diffusion region.
Åsnes A.
Borg Lori A.
Oieroset Marit
Ostgaard Nikolai
Pedersen Andreas
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