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We report a statistical analysis of low frequency magnetic variations (magnetic pulsations, 0.8-7 mHz) at South Pole in Antarctica (74°S corrected geomagnetic latitude) during 1996. The results show that the pulsation power exhibits two maxima during the day, one in the local pre-midnight hours, ass...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.574.173 http://solar.njit.edu/preprints/lanzerotti1234.pdf |
| Summary: | We report a statistical analysis of low frequency magnetic variations (magnetic pulsations, 0.8-7 mHz) at South Pole in Antarctica (74°S corrected geomagnetic latitude) during 1996. The results show that the pulsation power exhibits two maxima during the day, one in the local pre-midnight hours, associated with substorm occurrence, and the other in the local morning. During quiet magnetospheric conditions (Bz> 1nT), when the cusp is expected to be located poleward with respect to the station, the spectral and polarization characteristics of pulsations between 1-3 mHz suggest that resonant oscillations of the outermost closed field lines commonly occur at South Pole in the local morning. In order to investigate the spatial extension of the observed phenomena, we extend our analysis to simultaneous measurements made at Terra Nova Bay (80°S) and find that, in the polar cap, the magnetic variations exhibit different spectral and polarization characteristics. |
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