Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21b0270c&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM21B-0270
Physics
2407 Auroral Ionosphere (2704), 2437 Ionospheric Dynamics, 2704 Auroral Phenomena (2407), 2723 Magnetic Reconnection (7526, 7835), 2736 Magnetosphere/Ionosphere Interactions (2431)
Scientific paper
On December 19, 2002, between 9 and 10 UT the IMF turned from being B_z > 0 dominated to B_y > 0 dominated. In the following hour By was very stable and of the order of 15 - 18 nT, while B_z and Bx were close to zero. Throughout the whole period SuperDARN data allowed to reconstruct the convection patterns for both hemispheres. During the first hour, inspection of convection patterns reveals the presence of lobe reconnection cells in both hemispheres. As the IMF clock angle rotates towards 90°, it appears that near antiparallel reconnection develops in the prenoon sector in the Southern hemisphere and in the postnoon sector in the Northern hemisphere; moreover, there is some evidence that component merging may take place at the low latitude magnetopause. During the second hour, the B_y > 0 reconnection signatures persist in both hemispheres. Complementary to SuperDARN observations, the ITACA2 all-sky cameras operated by IFSI-INAF at Ny Alesund (Svalbard) and Daneborg (Greenland) observe a longitudinally bifurcated cusp topology between 9:30 and 11:00 UT, interpreted as due to precipitation coming from different reconnection sites in the Northern and Southern hemispheres.
Amata Ermanno
Coco I.
Marcucci Maria Federica
Massetti Stefano
Villain Jacques
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