Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51d1969c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA51D-1969
Physics
Plasma Physics
[2752] Magnetospheric Physics / Mhd Waves And Instabilities, [7836] Space Plasma Physics / Mhd Waves And Instabilities
Scientific paper
Magnetospheric ultra-low-frequency (ULF) waves with small azimuthal scale lengths, high azimuthal wavenumbers (m) have important implications in the condition of energetic particles. These high-m waves are invisible to ground magnetometers due to ionospheric screening, and they were only occasionally found in spacecraft data because of the stringent requirement in satellite separation for the proper identification of wavenumbers. Recently Le et al. [2011] discovered that the large number of Pc 2-3 waves observed by the ST-5 satellites at low altitudes were in fact Doppler shifted high-m waves with much lower frequencies in the Earth's frame. In this study we analyze all the Pc 2-3 events observed during the lifetime of ST-5 when ground magnetometer observations near the satellite footprints were available. The field line resonance (FLR) frequencies in the Earth's frame were confidently determined by ground observations through the use of the gradient technique. These FLR frequencies in turn helped estimate the m number of the ULF waves observed by ST-5 in space. Our analysis shows that the estimated wave numbers for the available wave events range from 40 to 250. The frequent occurrence of the high-m waves observed by the uniquely positioned ST-5 satellites strongly suggests that the existing space-based and ground-based experiments are not sufficient to capture this important class of waves in the magnetosphere.
Chi Peter J.
Le Guan
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