Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.4017m&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 24, p. 4017-4020
Physics
3
Magnetospheric Physics, Magnetospheric Physics: Magnetosphere-Outer, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions
Scientific paper
We analyze a Pc5 ULF pulsation event that occurred on 12 May, 1999, following an extended interval of extremely low solar wind dynamic pressure (ram pressure dropped to ~0.2nPa bow shock standoff position estimated at ~60RE). Using the IMAGE magnetometer array, we show that the extended magnetosphere at this time gave rise to an Alfvén continuum of field line oscillations in the outer magnetosphere of anomalously low frequency, consistent with field lines mapping out to large distances within the enlarged magnetospheric cavity. We demonstrate that the pulsation event was characterized by discrete, low frequency signals consistent with cavity/waveguide modes, and that these discrete modes couple to high latitude field line resonances during the event. Our observations suggest that cavity/waveguide modes continue as the dominant source of energy input to geomagnetic pulsations even during intervals when the magnetosphere is abnormally extended.
Mann Ian R.
Mathie R. A.
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