Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11b0315p&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM11B-0315
Mathematics
Logic
2712 Electric Fields (2411), 2721 Field-Aligned Currents And Current Systems (2409), 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431)
Scientific paper
We report on magnetically-conjugate Cluster and the Defense Meteorological Satellite Program (DMSP) satellite observations of sub-auroral ion drifts (SAID) during moderate geomagnetic activity levels on April 8, 2004. To our knowledge, the field-aligned separation of DMSP and Cluster (~ 28,000 km) is the largest separation ever analyzed with respect to the SAID phenomenon. Nonetheless, we show coherent, sub- auroral magnetosphere-ionosphere (MI) coupling along an entire fieldline in the post-dusk sector. The four Cluster spacecraft crossed SAID electric field channels with meridional magnitude EM~eq 25 mV/m in situ and latitudinal extent Δ Λ ≍ 0.5° in the southern and northern hemispheres near 07:00 and 07:30 UT, respectively. Cluster was near perigee (R \approx 4 RE) and within 5° (15°) of the magnetic equator for the southern (northern) crossing. The SAID were located near the plasmapause, within the ring-current-plasmasphere overlap (RCPO) region. Region 2 field- aligned current (R2 FAC) was observed across both SAID crossings. The most magnetically and temporally conjugate SAID field from DMSP F16A at 07:12 UT was practically identical in latitudinal size and R2 FAC strength to that mapped from Cluster. Since the DMSP ion drft meter saturated at 3000 m/s (or ~ 114 mV/m) and the electrostatically mapped value for EM from Cluster exceeded 300 mV/m, a magnitude comparison of EM was not possible. Although the conjugate measurements show similar large-scale SAID features, differences in substructure highlight the physical and chemical diversity of the conjugate regions.
Décréau Pierrette
Khotyaintsev Yu.
Kistler Lynn
Matsui Hideki
Mishin Evgeni V.
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