Longitudinal structure of low-latitude Pi2 pulsations and its dependence on aurora

Details Longitudinal structure of low-latitude Pi2 pulsations and its dependence on aurora Longitudinal structure of low-latitude Pi2 pulsations and its dependence on aurora

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10912206t&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A12, CiteID A12206

Physics

4

Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions

Scientific paper

The relationship between the spatial and temporal properties of auroral power and low-latitude magnetic Pi2 pulsations is statistically studied using auroral images obtained with the Ultraviolet Imager on the Polar spacecraft and magnetic fields measured at the Kakioka Observatory (L = 1.3). We select auroral intensification events from spatially integrated auroral power at time steps of ~180 s and for each event determine various properties of associated Pi2 pulsations in a 300-s time window. Since our auroral events are simply defined to be a power increase of 30% or greater, some events are well-defined substorm expansion phase onsets reaching 50 GW, but some are weak events reaching only ~1 GW. Nevertheless, the Pi2 pulsations show very similar local time patterns of amplitude and polarization regardless of the magnitude of the increase in auroral power. This implies that a single mechanism excites Pi2-band oscillations over a wide range of auroral activity. A likely source of the low-latitude pulsations is a plasmaspheric cavity mode, and our local time patterns of Pi2 parameters show features consistent with theoretical models of the cavity mode excited by longitudinally localized disturbances.

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