Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1769l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1769
Physics
2704 Auroral Phenomena (2407), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2790 Substorms
Scientific paper
With the recent success of using Polar ultraviolet imager (UVI) data to probe the global structure of the ultralow-frequency (ULF) waves in the magnetosphere associated with solar wind dynamic pressure enhancements, we now explore the global structure of ULF waves associated with magnetospheric substorms. We investigate ULF waves during the three phases of 5 large isolated substorm events and found: (1) Multiple monochromatic ULF waves appear in the Polar UVI images, (2) the "auroral pulsation" is confined on the nightside between 18 and 03 MLT with the maximum wave power coincident with the westward traveling surge, and (3) some of these ULF waves show the classical field line resonance (FLR) signature: A phase change of 180 degrees across the wave power maximum. In one event, we found discrete ULF waves occurring on the dayside from 04 to 17 MLT, with different frequencies from their nightside counterparts. These dayside ULF waves are likely to be associated with the magnetospheric cavity mode. We will present detailed analysis results and discuss implications of the results during the presentation.
Liou Kan
Takahashi Keitaro
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