Multi-scale radar and optical measurements of a substorm expansion

Details Multi-scale radar and optical measurements of a substorm expansion Multi-scale radar and optical measurements of a substorm expansion

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1697s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1697

Physics

0310 Airglow And Aurora, 2407 Auroral Ionosphere (2704), 2772 Plasma Waves And Instabilities (2471), 2788 Magnetic Storms And Substorms (7954)

Scientific paper

The substorm phases are most often discussed in terms of meso-scale features in the optical aurora, with limited consideration of the micro-scale physics governing how this visual information is produced. Recently deployed radio and optical instruments at Poker Flat, AK, are providing new insight into the elemental processes underlying the global-scale drivers observed in the distant magnetosphere. In this paper, this new observational information is presented in the context of multi-scale measurements of a substorm that occurred on 23 March 2007. We take, as the starting point, measurements of the large-scale electromagnetic perturbations observed by the THEMIS satellites. We then consider the cascade of energy conversion from the perspective of conjugate, multi-scale, ground-based observations--in particular, the THEMIS all-sky camera array, the Poker Flat Incoherent Scatter Radar (PFISR), and two colocated narrow- field spectral imaging system. Observation of coherent wave-packets in the aurora, accompanied by ion- acoustic turbulence in common-volume ISR measurements, suggests that the substorm energy is dissipated in Alfven resonant cones which, in turn, appear to form coherently with magnetic pulsations in the Pi2 range.

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