Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm52a..06l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM52A-06
Physics
2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2790 Substorms
Scientific paper
Ground-based observations of Pi1B pulsations at substorm onset have been reported by several researchers, using data from various ground-based platforms. Some recent evidence indicates that these pulsations may drive Alfvenic aurora at onset, providing, at least in part, a source for the initial brightening. Arnoldy et al. [1998] showed that these pulsations can also be observed at geosynchronous orbit at substorm onset, with such observations having a reasonable correlation to ground observations. These authors noted, however, that specific onset times depend strongly on differences in MLT between the ground stations and the satellite. Still, the occurrence of Pi1B pulsations at geosynchronous orbit implies that they originate near or beyond this region, perhaps providing a means to couple energy from deeper in the tail to the ionosphere at onset. In order to better understand the apparent relationship between ground-based and geosynchronous observations of Pi1B pulsations, we have investigated a number of events having good conjunctions in detail. In this presentation, we show the results of this study and discuss the resulting implications. Arnoldy, R. L., J. L. Posch, M. J. Engebretson, H. Fukunishi and H. J. Singer, Pi1 magnetic pulsations in space and at high latitudes on the ground, JGR, 103, A10, 23581-23592, doi:10.1029/98JA01917
Engebretson Mark J.
Lessard Marc R.
Mouikis Christopher
Singer Howard J.
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