TY  - JOUR
AU  - Francia, P.
AU  - Lanzerotti, L. J.
AU  - Villante, U.
AU  - Lepidi, S.
AU  - Di Memmo, D.
PY  - 2005//
TI  - A statistical analysis of low-frequency magnetic pulsations at cusp and cap latitudes in Antarctica
T2  - J. Geophys. Res.
JO  - Journal of geophysical research-atmospheres
VL  - 110
PB  - American Geophysical Union
KW  - polar cap and cusp pulsations
KW  - magnetospheric wave guide modes
KW  - field line resonances
KW  - open/closed field line boundary
KW  - 2784 Magnetospheric Physics: Solar wind/magnetosphere interactions
KW  - 2740 Magnetospheric Physics: Magnetospheric configuration and dynamics
KW  - 2776 Magnetospheric Physics: Polar cap phenomena
KW  - 2706 Magnetospheric Physics: Cusp
KW  - 2752 Magnetospheric Physics: MHD waves and instabilities
N2  - We report a statistical analysis of low-frequency magnetic variations (magnetic pulsations, 0.8–7 mHz) at South Pole (74°S corrected geomagnetic latitude) and Terra Nova Bay (80°S) during 1996. The results show that at South Pole (at cusp latitudes) the pulsation power exhibits two maxima during the day, one in the local premidnight and the other in the morning. The first maximum disappears when the analysis is restricted to northward interplanetary magnetic field conditions (B z > 1 nT), suggesting that it might be associated to substorm phenomena. During closed magnetospheric conditions, when the cusp is expected to be located poleward with respect to the station, the spectral and polarization characteristics of pulsations between 1 and 3 mHz suggest that resonant oscillations of the outermost closed field lines commonly occur at South Pole in the local morning. At Terra Nova Bay, in the polar cap, the pulsation power is much lower and its diurnal variation is characterized by a single maximum, which occurs around local noon, when the station approaches the cusp. The corresponding polarization pattern indicates that Terra Nova Bay is always located poleward with respect to resonant field lines.
SN  - 0148-0227
UR  - http://dx.doi.org/10.1029/2004JA010680
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=5495), last updated on Wed, 15 Apr 2009 18:17:10 +0200
ID  - Francia_etal2005
ER  -