Ground-based Observations of ULF Waves in the Cusp Region and at Substorm Onset as Possible Evidence for Reconnection

Details Ground-based Observations of ULF Waves in the Cusp Region and at Substorm Onset as Possible Evidence for Reconnection Ground-based Observations of ULF Waves in the Cusp Region and at Substorm Onset as Possible Evidence for Reconnection

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm43c1241l&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM43C-1241

Physics

2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2706 Cusp, 2723 Magnetic Reconnection (7526, 7835), 2772 Plasma Waves And Instabilities (2471), 2790 Substorms

Scientific paper

Various studies have shown increasingly that Pi1B pulsations are associated with substorm onset. While these pulsations have been observed on the ground for decades, recent results show that they are also observed at geosynchronous orbit at substorm onset, where they are compressional in nature. Signatures of pulsations with quite similar characteristics have also been observed on the ground in the cusp region. The similar characteristics of these pulsations, observed at times and locations where reconnection is often thought to occur, raises the question whether these pulsations may, in fact, be artifacts of the reconnection process. In this study, spectral properties associated with reconnection are investigated using results of two fluid numerical simulations of reconnection in simple geometries. The spectral analysis considers the variability in various quantities during the reconnection process, with the implicit assumption that the variability is emitted in the form of wave power that eventually is observed in space and on the ground.

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