Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51a1921b&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA51A-1921
Physics
[2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
Ultra-low-frequency (ULF) waves in the Pc1-2 frequency range (0.1-5 Hz) serve as diagnostics of plasma processes in Earth's magnetosphere, and contribute to reducing the fluxes of energetic ions in the ring current and energetic electrons in the radiation belts. We report here on a study of the occurrence of Pc 1-2 waves from April 2006 through December 2010 in data obtained from an array of ground-based search coil magnetometers in Antarctica: Halley (62° MLAT), AGO P2 (70° MLAT), AGO P3 (72° MLAT), South Pole (74° MLAT), AGO P1 (80°), and McMurdo (80° MLAT). Wave occurrences and their latitudinal profiles were compared to variations in the Dst index. During pre-storm intervals, waves were associated with compressions (transient increases in Dst) or with the recovery phase of a previous magnetic storm. During storm main phase, waves were observed only during strong storms (minimum Dst < -80); only broadband noise appeared during the main phase of weaker storms. During the first 1-2 days of the recovery phase no waves were observed. Waves appeared sooner, on average, and occurred more frequently and often with greater intensity, after stronger storms. Compression-induced waves appeared for Dst increases of from 1 to 25 nT; above 25 nT ULF activity was more broadband. There was a clear latitudinal pattern in wave occurrence: storm-time waves occurred most often at Halley, while compression-induced waves were most common at South Pole; occurrences at AGO P2 and P3 were intermediate. In many cases, waves appeared simultaneously at AGO P2 and Halley and were most intense at Halley, but wave activity persisted longer at AGO P2.
Bhowmik R.
Engebretson Mark J.
Lessard Marc
Posch Jennifer L.
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