Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm33b..04e&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM33B-04
Other
2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities (2149, 6050, 7836)
Scientific paper
A three-axis search coil magnetometer was deployed at the Halley research station near the coast of Antarctica (L = 4.2) in February 2005. We report here on some of the initial observations of Pc 1 and 2 waves recorded at this site, and in particular on selected events observed simultaneously by one or more of the four Cluster spacecraft during their perigee pass through the inner magnetosphere down to L ~ 4.4. We have previously observed instances in which all four Cluster spacecraft observed similar, simultaneous dayside wave activity, as well as instances in which only one of the four spacecraft observed such waves. These suggest that the regions of the dayside magnetosphere which can become unstable to ion cyclotron wave growth can vary in size from ~ 0.1 RE to over 0.5 RE. On September 30, 2005 waves with frequencies from 0.3 to 0.8 Hz with a pearl-like temporal structure were observed at Halley for several hours before local noon. Cluster 3, located ~ 2 hours MLT east of Halley, observed waves with a similar frequency range but without pearl structure over a narrow L range at L = 5.7 ± 0.1. No wave activity was observed at any of the other Cluster spacecraft at nearby locations. The wide range of frequencies of waves propagating along a flux tube narrow in L, and the absence of activity at the other spacecraft, may serve to constrain models of pearl generation. In particular, these observations suggest that pearls, which are observed almost exclusively in ground-based records, cannot necessarily be ascribed to interference between signals propagating from several nearby flux tubes.
Engebretson Mark J.
Fornacon K.-
Glassmeier K.-
Horne Richard B.
Lessard Marc R.
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