A Satellite-Ground Study of Low-Latitude Pi2 Pulsations

Details A Satellite-Ground Study of Low-Latitude Pi2 Pulsations A Satellite-Ground Study of Low-Latitude Pi2 Pulsations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41b1467f&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM41B-1467

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2790 Substorms

Scientific paper

It is well-known that Pi2 geomagnetic pulsations are triggered by substorm onset, and may couple to field line resonances in the outer magnetosphere. Recent modelling also suggests that at low latitudes Pi2 may couple to plasmaspheric cavity modes. The amplitude and phase relationship between the Pi2 in these two regions is not clear, nor is it clear what effect the ionosphere has on these properties as the waves propagate to the ground. We report a study using the Oersted low-Earth orbit (600-850 km) spacecraft and ground magnetometer arrays in which we compared the spectra, amplitude and phase of Pi2 pulsations observed at widely spaced latitudes on the ground. Using case studies, we find that the amplitude of Pi2 events at Oersted in the azimuthal and meridional components is significantly larger than on the ground, while amplitudes on the ground are similar for stations spanning the plasmasphere. There is a nearly constant phase difference between the Pi2 on Oersted and at plasmaspheric ground stations. In the outer magnetosphere the Pi2 amplitudes and phases increase markedly. These results support the idea that low latitude Pi2 are couple to resonances of the plasmaspheric cavity, and at higher latitudes to field line resonances.

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