Seasonal variations of Pi1B propagation asymmetries at conjugate hemispheres in association with substorm onset

Details Seasonal variations of Pi1B propagation asymmetries at conjugate hemispheres in association with substorm onset Seasonal variations of Pi1B propagation asymmetries at conjugate hemispheres in association with substorm onset

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm44b..03k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM44B-03

Physics

2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2736 Magnetosphere/Ionosphere Interactions (2431), 2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2790 Substorms

Scientific paper

Ground-based observations have shown that Pi1B magnetic pulsations, characterized by broadband bursts in the ULF range (periods of 1 to 40 s), have been well-correlated with substorm onsets. Recent work shows that these are also observed at geosynchronous orbit in conjunction with onset, where they are compressional in nature. Studies have shown that these pulsations provide an onset signature with timing precision on the order of a few seconds and, also, that the ground stations that detect this signature need only be located within a couple of hours in MLT of the onset. In this study, observations at nominally conjugate stations (South Pole and Iqaluit) are used to determine differences in substorm onsets in opposite hemispheres. This statistical study spanning two years shows a wide range in onset time differences. For periods of perhaps a few months, however, there are times when onset does occur preferentially in one hemisphere. These features imply that these pulsations may provide new insight regarding Pi1B wave source and propagation mechanisms in association with substorm onsets in opposite hemispheres. To examine these seasonal asymmetries of the wave propagations, the variations of the magnetospheric geometry such as IMF clock angle and dipole tilt angle are considered.

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