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Ann. Geophys., 21, 493-508, 2003
https://doi.org/10.5194/angeo-21-493-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
28 Feb 2003
Ps 6 disturbances: relation to substorms and the auroral oval
M. Connors1, G. Rostoker2,6, G. Sofko3, R. L. McPherron4, and M. G. Henderson5 1Centre for Science, Athabasca University,Athabasca, AB T9S 3A3 Canada
2Department of Physics, University of Alberta, Edmonton, AB T6G 2E1 Canada
3Department of Physics and Engineering Physics, 116 Science Place, Saskatoon, SK S7N 5E2 Canada
4Institute for Geophysics and Space Physics, University of California, Los Angeles, Los Angeles, CA 90024-1567 USA
5Mail Stop D-436 Los Alamos National Laboratory, Los Alamos, NM 87545 USA
6Solar-Terrestrial Environment Laboratory Nagoya University, Toyakawa Aichi 442-8507 Japan
Abstract. Ps 6 disturbances and associated omega bands are often considered to be part of the phenomenology of the recovery phase of substorms. We note cases of the initiation of Ps 6 activity at or very near the time of onset, either of a substorm expansive phase, a pseudobreakup, or a poleward border intensification. Thus, we claim that Ps 6 disturbances need not be viewed primarily as phenomena of the recovery phase. This produces both the challenge of explaining Ps 6 within a broader context and the opportunity to use Ps 6 observations to better understand magnetospheric phenomenology, including expansive phase onsets. We further examine the position of the causative currents for Ps 6 and find that they may be located at either the equatorward or poleward border of the auroral oval, or within it. In the first case, the relationship of expansive phase onset and time delay to Ps 6 initiation appears to be very short. In the latter case, there is an association with poleward border intensification, but with a measurable time delay. We present HF radar data to discuss how the electric field at onset time favors the growth of Ps 6 current systems.

Key words. Magnetospheric physics (Storms and substorms; Electric fields; MHD waves and instabilities)


Citation: Connors, M., Rostoker, G., Sofko, G., McPherron, R. L., and Henderson, M. G.: Ps 6 disturbances: relation to substorms and the auroral oval, Ann. Geophys., 21, 493-508, https://doi.org/10.5194/angeo-21-493-2003, 2003.
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