| Title | Low and mid-frequency pulsations in the polar cap; polarization pattern and MLT dependence of the spectral power during the descending phase of the solar cycle |
| Author | De Lauretis, M.; Francia, P.; Piancatelli, A.; Vellante, M.; Villante, U. |
| Author Affil | De Lauretis, M., Universita dell'Aquila, Dipartimento di Fisica, L'Aquila, Italy. Other: Consorzio Area di Ricerca in Astrogeofisica, Italy |
| Source | Annals of Geophysics, 52(1), p.27-34, ; International Union of Geodesy and Geophysics general assembly, symposium on Geomagnetic measurements in remote regions, Perugia, Italy, July 2-12, 2007, edited by A. De Santis, B. Arora and H. McCreadie. Publisher: Editrice Compositori, Bologna, Italy. ISSN: 1593-5213 |
| Publication Date | Feb. 2009 |
| Notes | In English. 18 refs. GeoRef Acc. No: 296995 |
| Index Terms | Antarctica--Dome C; polar caps; Antarctica--Terra Nova Bay; Antarctica; Concordia Station; Dome C; geophysical methods; geophysical surveys; low frequency; magnetic field; magnetic local time; magnetic methods; magnetization; observations; solar cycles; statistical analysis; surveys; Terra Nova Bay; ultra low frequency; Victoria Land; Wilkes Land |
| Abstract | We present a statistical analysis of ULF (1-100 mHz) geomagnetic measurements conducted during years 2003-2006 at the Italian/French base of Concordia at Dome C, close to the geomagnetic pole, and at the Italian base "Mario Zucchelli" at Terra Nova Bay, also located in the polar cap, but at lower latitude. Our analysis shows that high latitude ULF pulsation power is largely controlled by the solar wind speed. At Terra Nova Bay the power shows a maximum at local noon, clearly related to cusp and closed field lines phenomena. At few mHz, the polarization pattern indicates field line resonances driven, just equatorward with respect to the station, by waves propagating tailward; the polarization of higher frequency pulsations, mostly originated from interplanetary upstream waves, suggests waves propagating sunward from the night sector. At Dome C the wave power shows a small enhancement in the local morning, more pronounced for mid-frequency pulsations; the polarization pattern, at all frequencies, appears to indicate waves propagating sunward from the night sector, suggesting a propagation channel to the ground via the magnetotail lobes. |
| Publication Type | conference paper or compendium article |
| Record ID | 87419 |