Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm13b..08g&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM13B-08
Physics
2407 Auroral Ionosphere (2704), 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2744 Magnetotail, 2790 Substorms, 2794 Instruments And Techniques
Scientific paper
Some of the early subauroral observations with the new SuperDARN radar at the NASA Wallops Flight Facility have indicated rapid changes in ionospheric convection in the nighttime sector on time scales of 2 minutes or less. Typically, the line-of-sight velocities observed along many of the radar viewing directions varied by as much as a few hundred meters per second about a baseline value of less than 100 m/s. The variations last from a few minutes to a few tens of minutes and there is evidence that they are associated with the substorm expansion phase. In this paper we relate this phenomenon to a number of processes occurring in the midnight sector ionosphere at similar and higher latitudes. In particular, we have found that it is strongly correlated with ground magnetic pulsations that are typically associated with PI2 waves. We show examples of these velocity variations and associated magnetic variations. We further present examples of concurrent magnetotail data indicating substorm processes. All these observations suggest that the subauroral ionosphere also displays impacts of magnetospheric substorms.
Baker Jeff
Barnes Robin
Gjerloev Jesper W.
Greenwald Ray A.
Oksavik Kjellmar
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