Spaced-based counterparts of substorm onset ULF waves

Details Spaced-based counterparts of substorm onset ULF waves Spaced-based counterparts of substorm onset ULF waves

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm53b..05r&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM53B-05

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2744] Magnetospheric Physics / Magnetotail, [2790] Magnetospheric Physics / Substorms

Scientific paper

The temporal sequence of events at substorm onset requires the generation and propagation of electromagnetic waves as the system evolves from its pre- to post-onset state. Such waves offer a unique diagnostic for the dynamics of this system, and the important coupling between the equatorial magnetosphere and auroral onset dynamics in the ionosphere. We detail the ground auroral and magnetic response to both substorms and nightside auroral activations, with particular focus on characterising the space-based counterparts of the well-known onset sequence of the auroral substorm in the ionosphere. We present specific case studies and some statistics of the evolution of magnetic wave power and auroral intensity throughout the late growth phase and expansion phase of the substorm cycle. We show strong evidence that some substorm-related auroral enhancements are clearly and demonstrably linked to the evolution of ULF wave power, such as onset arc auroral beads, whilst others have a smaller ULF wave signature. We utilise multi-point multi-instrument conjunctions from THEMIS, Cluster and GOES and other platforms to probe the magnetospheric counterpart of the ground-based signatures through onset, using a range of time-series analysis techniques. In particular, we examine the implied mapping of Pi1-2 onset signatures, which often show a clear ionospheric epicentre, to dynamical processes in the magnetotail in an attempt to diagnose the plasma physics linking onset arcs to their energy sources in the tail.

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