Azimuthal propagation of Pc5 geomagnetic field pulsations in the southern polar cap
A statistical analysis of low frequency geomagnetic fluctuations at the two Antarctic stations Mario Zucchelli Station (geographic coordinates: 74.7 S, 164.1 E; corrected geomagnetic coordinates: 80.0 S, 306.8 E) and Dumont D’Urville (geographic coordinates: 66.7 S, 140.0 E; corrected geomagnetic co...
| Published in: | Advances in Space Research |
|---|---|
| Main Authors: | , , , |
| Other Authors: | , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Elsevier
2011
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| Subjects: | |
| Online Access: | http://hdl.handle.net/2122/7024 https://doi.org/10.1016/j.asr.2010.10.027 |
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ftingv:oai:www.earth-prints.org:2122/7024 |
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openpolar |
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Open Polar |
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Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
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ftingv |
| language |
English |
| topic |
(2784) Solar wind-magnetosphere interactions (2776) Polar cap phenomena (2752) MHD waves and instabilities 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals |
| spellingShingle |
(2784) Solar wind-magnetosphere interactions (2776) Polar cap phenomena (2752) MHD waves and instabilities 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals Lepidi, S. Cafarella, L. Pietrolungo, M. Santarelli, L. Azimuthal propagation of Pc5 geomagnetic field pulsations in the southern polar cap |
| topic_facet |
(2784) Solar wind-magnetosphere interactions (2776) Polar cap phenomena (2752) MHD waves and instabilities 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals |
| description |
A statistical analysis of low frequency geomagnetic fluctuations at the two Antarctic stations Mario Zucchelli Station (geographic coordinates: 74.7 S, 164.1 E; corrected geomagnetic coordinates: 80.0 S, 306.8 E) and Dumont D’Urville (geographic coordinates: 66.7 S, 140.0 E; corrected geomagnetic coordinates: 80.4 S, 236.0 E) is shown. The analysis focuses on power spectra, coherence and phase difference between the stations, which are both located in the polar cap, with a 5-h magnetic local time displacement along a geomagnetic parallel; in this situation, the phase difference between geomagnetic fluctuations indicates the direction of their azimuthal propagation. Coherent fluctuations have been found to occur preferably when both stations are on the same side (dawnward or duskward) with respect to the polar cusp; moreover, around local magnetic midnight, they occur essentially during open magnetospheric conditions. The phase difference for coherent fluctuations indicates a propagation direction away from local geomagnetic noon and midnight. Also the analysis of three individual pulsation events, occurring at different times during the day, is shown; they are characterized at the two stations by simultaneous, coherent fluctuations, whose phase difference finds correspondence with the statistical behaviour. 2010 COSPAR. Published by Elsevier Ltd. All rights reserved. Published 966-977 1.6. Osservazioni di geomagnetismo JCR Journal restricted |
| author2 |
Lepidi, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Cafarella, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Pietrolungo, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Santarelli, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia |
| format |
Article in Journal/Newspaper |
| author |
Lepidi, S. Cafarella, L. Pietrolungo, M. Santarelli, L. |
| author_facet |
Lepidi, S. Cafarella, L. Pietrolungo, M. Santarelli, L. |
| author_sort |
Lepidi, S. |
| title |
Azimuthal propagation of Pc5 geomagnetic field pulsations in the southern polar cap |
| title_short |
Azimuthal propagation of Pc5 geomagnetic field pulsations in the southern polar cap |
| title_full |
Azimuthal propagation of Pc5 geomagnetic field pulsations in the southern polar cap |
| title_fullStr |
Azimuthal propagation of Pc5 geomagnetic field pulsations in the southern polar cap |
| title_full_unstemmed |
Azimuthal propagation of Pc5 geomagnetic field pulsations in the southern polar cap |
| title_sort |
azimuthal propagation of pc5 geomagnetic field pulsations in the southern polar cap |
| publisher |
Elsevier |
| publishDate |
2011 |
| url |
http://hdl.handle.net/2122/7024 https://doi.org/10.1016/j.asr.2010.10.027 |
| long_lat |
ENVELOPE(140.000,140.000,-66.667,-66.667) ENVELOPE(164.123,164.123,-74.695,-74.695) ENVELOPE(164.117,164.117,-74.700,-74.700) |
| geographic |
Antarctic Dumont d’Urville Mario Zucchelli Mario Zucchelli Station |
| geographic_facet |
Antarctic Dumont d’Urville Mario Zucchelli Mario Zucchelli Station |
| genre |
Antarc* Antarctic |
| genre_facet |
Antarc* Antarctic |
| op_relation |
Advances in Space Research 6/47(2011) http://hdl.handle.net/2122/6223 Arnoldy, R.L., Cahill Jr., L.J., Engebretson, M.J., Lanzerotti, L.J., Wolfe, A. Review of hydromagnetic wave studies in the Antarctic. Rev. Geophys. 26, 181–207, 1988. Atkinson, G., Watanabe, T. Surface waves in the magnetospheric boundary as a possible origin of long period geomagnetic micropulsations. Earth Planet. Sci. Lett. 1, 89–91, 1966. Baker, G.J., Donovan, E.F., Jackel, B.J. A comprehensive survey of auroral latitude Pc5 pulsation characteristics. J. Geophys. Res. 108 (A10), 1384, doi:10.1029/2002JA009801, 2003. Chen, S.H., Kivelson, M.G. On ultralow frequency waves in the lobes of the Earths magnetotail. J. Geophys. Res. 96 (A9), 15711–15723, 1991. Engebretson, M.J., Hughes, W.J., Alford, J.L., Zesta, E., Cahill, L.J., Arnoldy, R.L., Reeves, G.D. Magnetometer array for cusp and cleft studies observations of the spatial extent of broadband ULF magnetic pulsations of cusp/cleft latitudes. J. Geophys. Res. 100, 19371–19386, 1995. Engebretson, M.J., Posh, J.L., Pilipenko, V.A., Chugunova, O.M. ULF waves at very high latitudes, in: Takahashi, K. et al. (Eds.), Geophysical Monograph, Magnetospheric ULF Waves: Synthesis and New Directions, vol. 169. AGU, Washington, DC, pp. 137–156, 2006. Ershkovich, A.I., Nusinov, A.A. Geomagnetic tail oscillations. Cosmic Electrodyn. 2, 471–480, 1972. Francia, P., Lanzerotti, L.J., Villante, U., Lepidi, S., Di Memmo, D. A statistical analysis of low-frequency magnetic pulsations at cusp and cap latitudes in Antarctica. J. Geophys. Res. 110 (A2), A02205, doi:10.1029/2004JA010680, 2005. Gonzalez, W.D., Tsurutani, B.T., Clua de Gonzalez, A.M. Interplanetary origin of geomagnetic storms. Space Sci. Rev. 88, 529–562, 1999. Heacock, R.R., Hunsucker, R.D. Type Pi 1–2 magnetic field pulsations. Space Sci. Rev. 28 (2), 191–221, 1981. Iijima, T. Field-aligned currents in geospace: substance and significance, in: Ohtani, S.-I., Fujii, R., Hesse, M., Lysak, R.L. (Eds.), Magnetospheric Current Systems, Gephysical Monograph, vol. 118, pp. 107–129, 2000. Kangas, J., Lukkari, L., Heacock, R.R. Observations of evening magnetic pulsations in the auroral zone during the substorm. J. Atmos. Terr. Phys. 38, 1177–1181, 1976. Lanzerotti, L.J., Shono, A., Fukunishi, H., Maclennan, C.G. Long period hydromagnetic waves at very high geomagnetic latitudes. J. Geophys. Res. 104, 28423–28435, 1999. Lepidi, S., Villante, U., Vellante, M., Palangio, P., Meloni, A. High resolution geomagnetic field observations at Terra Nova Bay, Antarctica. Ann. Geofis. 39 (3), 519–528, 1996. Lepidi, S., Francia, P., Villante, U., Lanzerotti, L.J., Meloni, A. Polarization pattern of low-frequency geomagnetic field fluctuations (0.8–3.6 mHz) at high and low latitude. J. Geophys. Res. 104 (A1), 305–310, 1999a. Lepidi, S., Francia, P., Villante, U., Meloni, A., Lazarus, A.J., Lepping, R.P. The Earth’s passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions. Ann. Geophys. 17, 1245–1250, 1999b. Lepidi, S., Cafarella, L., Francia, P., Meloni, A., Palangio, P., Schott, J.J. Low frequency geomagnetic field variations at Dome C (Antartica). Ann. Geophys. 21, 923–932, 2003. Lepidi, S., Francia, P. Diurnal polarization pattern of ULF geomagnetic pulsations in the Pc5 band from low to polar latitudes. J. Atmos. Solar-Terr. Phys. 65, 1179–1185, 2003. Lloyd, H. On earth-currents, and their connexion with the diurnal changes of the horizontal magnetic needle. Trans. Roy. Irish Acad. 24, 115– 141, 1861. Lui, A.T.Y. Current controversies in magnetospheric physics. Rev. Geophys. 39 (4), 535–563, 2001. Meloni, A., Palangio, P., Cafarella, L., Romeo, G., Bozzo, E., Caneva, G. The geomagnetic observatory at Terra Nova Bay Base. Terra Antarctica 1, 181–183, 1997. Miura, A. Dependence of the magnetopause Kelvin–Helmholtz instability on the orientation of the magnetosheath magnetic field. Geophys. Res. Lett. 22, 2993–2996, 1995. Newell, P.T., Meng, C.-I. Dipole tilt angle effects on the latitude of the cusp and cleft/low latitude boundary layer. J. Geophys. Res. 94, 6949– 6953, 1989. Olson, J.V. ULF signatures of the polar cusp. J. Geophys. Res. 91, 10055–10062, 1986. Olson, J.V., Rostoker, G. Longitudinal phase variations of Pc4–5 micropulsations. J. Geophys. Res. 83, 2481–2488, 1978. Phan, T.D., Escoubet, C.P., Rezeau, L., Treumann, R.A., Vaivads, A., Paschmann, G., Fuselier, S.A., Attie´, D., Rogers, B., Sonnerup, B.U.O¨ . Magnetopause processes. Space Sci. Rev. 118, 367–424, 2005. Pilipenko, V.A., Chugunova, O.M., Engebretson, M.J. Pc3–4 ULF waves at polar latitudes. J. Atmos. Solar-Terr. Phys. 70, 2262–2274, 2008. Russell, C.T. The polar cusp. Adv. Space Res. 25, 1413–1424, 2000. Samson, J.C. Three-dimensional polarization characteristics of high latitude Pc5 geomagnetic micropulsations. J. Geophys. Res. 77, 6145– 6160, 1972. Samson, J.C. Geomagnetic pulsations and plasma waves in the Earth’s magnetosphere, in: Jacobs, J.A. (Ed.), Geomagnetism, vol. 4. Academic Press, pp. 481–592, 1991. Santarelli, L., Lepidi, S., Palangio, P., Cafarella, L. Pc3–Pc4 pulsations at Terra Nova Bay (Antarctica): seasonal dependence of the power and its relation with solar wind parameters. Mem. S.A.It. 74, 766–769, 2003. Santarelli, L., Lepidi, S., Cafarella, L. Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations. Ann. Geophys. 25, 2405–2412, 2007. Sarafopoulos, D.V. Long duration Pc5 compressional pulsations inside the Earth’s magnetotail lobes. Ann. Geophys. 13 (9), 926–937, 1995. Villante, U., Francia, P., Lepidi, S., De Lauretis, M., Pietropaolo, E., Cafarella, L., Meloni, A., Lazarus, A.J., Lepping, R.P., Mariani, F. Geomagnetic field variations at low and high latitude during the January 10–11, 1997 magnetic cloud. Geophys. Res. Lett. 25, 2593– 2596, 1998. Villante, U., Lepidi, S., Francia, P., Vellante, M., Meloni, A., Palangio, P. ULF fluctuations at Terra Nova Bay (Antarctica). Ann. Geofis. 43 (2), 217–227, 2000. Weatherwax, A.T., Rosenberg, T.J., Maclennan, C.G., Doolittle, J.H., et al. Substorm precipitation in the polar cap and associated Pc 5 modulation. Geophys. Res. Lett. 24 (5), 579– 582, 1997. Yagova, N.V., Lanzerotti, L.J., Villante, U., Pilipenko, V.A., Lepidi, S., Francia, P., Papitashvili, V.O., Rodger, A.S. ULF Pc5–6 magnetic activity in the polar cap as observed along a geomagnetic meridian in Antarctica. J.Geophys. Res. 107 (A8), 1195, doi:10.1029/2001JA900143, 2002. Yagova, N.V., Pilipenko, V.A., Lanzerotti, L.J., Engebretson, M.J., Rodger, A.S., Lepidi, S., Papitashvili, V.O. Two-dimensional structure of long-period pulsations at polar latitudes in Antarctica. J. Geophys. Res. 109, A03222, doi:10.1029/2003JA010166, 2004. Zhou, X.W., Russell, C.T., Le, G., Fuselier, S.A., Scudder, J.D. The polar cusp location and its dependence on dipole tilt. Geophys. Res. Lett. 26, 429–432, 1999. Zhou, X.W., Russell, C.T., Le, G., Fuselier, S.A., Scudder, J.D. Solar wind control of the polar cusp at high altitude. J. Geophys. Res. 105, 245–252, 2000. http://hdl.handle.net/2122/7024 doi:10.1016/j.asr.2010.10.027 |
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ftingv:oai:www.earth-prints.org:2122/7024 2023-05-15T14:01:36+02:00 Azimuthal propagation of Pc5 geomagnetic field pulsations in the southern polar cap Lepidi, S. Cafarella, L. Pietrolungo, M. Santarelli, L. Lepidi, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Cafarella, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Pietrolungo, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Santarelli, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia 2011-03-15 http://hdl.handle.net/2122/7024 https://doi.org/10.1016/j.asr.2010.10.027 en eng Elsevier Advances in Space Research 6/47(2011) http://hdl.handle.net/2122/6223 Arnoldy, R.L., Cahill Jr., L.J., Engebretson, M.J., Lanzerotti, L.J., Wolfe, A. Review of hydromagnetic wave studies in the Antarctic. Rev. Geophys. 26, 181–207, 1988. Atkinson, G., Watanabe, T. Surface waves in the magnetospheric boundary as a possible origin of long period geomagnetic micropulsations. Earth Planet. Sci. Lett. 1, 89–91, 1966. Baker, G.J., Donovan, E.F., Jackel, B.J. A comprehensive survey of auroral latitude Pc5 pulsation characteristics. J. Geophys. Res. 108 (A10), 1384, doi:10.1029/2002JA009801, 2003. Chen, S.H., Kivelson, M.G. On ultralow frequency waves in the lobes of the Earths magnetotail. J. Geophys. Res. 96 (A9), 15711–15723, 1991. Engebretson, M.J., Hughes, W.J., Alford, J.L., Zesta, E., Cahill, L.J., Arnoldy, R.L., Reeves, G.D. Magnetometer array for cusp and cleft studies observations of the spatial extent of broadband ULF magnetic pulsations of cusp/cleft latitudes. J. Geophys. Res. 100, 19371–19386, 1995. Engebretson, M.J., Posh, J.L., Pilipenko, V.A., Chugunova, O.M. ULF waves at very high latitudes, in: Takahashi, K. et al. (Eds.), Geophysical Monograph, Magnetospheric ULF Waves: Synthesis and New Directions, vol. 169. AGU, Washington, DC, pp. 137–156, 2006. Ershkovich, A.I., Nusinov, A.A. Geomagnetic tail oscillations. Cosmic Electrodyn. 2, 471–480, 1972. Francia, P., Lanzerotti, L.J., Villante, U., Lepidi, S., Di Memmo, D. A statistical analysis of low-frequency magnetic pulsations at cusp and cap latitudes in Antarctica. J. Geophys. Res. 110 (A2), A02205, doi:10.1029/2004JA010680, 2005. Gonzalez, W.D., Tsurutani, B.T., Clua de Gonzalez, A.M. Interplanetary origin of geomagnetic storms. Space Sci. Rev. 88, 529–562, 1999. Heacock, R.R., Hunsucker, R.D. Type Pi 1–2 magnetic field pulsations. Space Sci. Rev. 28 (2), 191–221, 1981. Iijima, T. Field-aligned currents in geospace: substance and significance, in: Ohtani, S.-I., Fujii, R., Hesse, M., Lysak, R.L. (Eds.), Magnetospheric Current Systems, Gephysical Monograph, vol. 118, pp. 107–129, 2000. Kangas, J., Lukkari, L., Heacock, R.R. Observations of evening magnetic pulsations in the auroral zone during the substorm. J. Atmos. Terr. Phys. 38, 1177–1181, 1976. Lanzerotti, L.J., Shono, A., Fukunishi, H., Maclennan, C.G. Long period hydromagnetic waves at very high geomagnetic latitudes. J. Geophys. Res. 104, 28423–28435, 1999. Lepidi, S., Villante, U., Vellante, M., Palangio, P., Meloni, A. High resolution geomagnetic field observations at Terra Nova Bay, Antarctica. Ann. Geofis. 39 (3), 519–528, 1996. Lepidi, S., Francia, P., Villante, U., Lanzerotti, L.J., Meloni, A. Polarization pattern of low-frequency geomagnetic field fluctuations (0.8–3.6 mHz) at high and low latitude. J. Geophys. Res. 104 (A1), 305–310, 1999a. Lepidi, S., Francia, P., Villante, U., Meloni, A., Lazarus, A.J., Lepping, R.P. The Earth’s passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions. Ann. Geophys. 17, 1245–1250, 1999b. Lepidi, S., Cafarella, L., Francia, P., Meloni, A., Palangio, P., Schott, J.J. Low frequency geomagnetic field variations at Dome C (Antartica). Ann. Geophys. 21, 923–932, 2003. Lepidi, S., Francia, P. Diurnal polarization pattern of ULF geomagnetic pulsations in the Pc5 band from low to polar latitudes. J. Atmos. Solar-Terr. Phys. 65, 1179–1185, 2003. Lloyd, H. On earth-currents, and their connexion with the diurnal changes of the horizontal magnetic needle. Trans. Roy. Irish Acad. 24, 115– 141, 1861. Lui, A.T.Y. Current controversies in magnetospheric physics. Rev. Geophys. 39 (4), 535–563, 2001. Meloni, A., Palangio, P., Cafarella, L., Romeo, G., Bozzo, E., Caneva, G. The geomagnetic observatory at Terra Nova Bay Base. Terra Antarctica 1, 181–183, 1997. Miura, A. Dependence of the magnetopause Kelvin–Helmholtz instability on the orientation of the magnetosheath magnetic field. Geophys. Res. Lett. 22, 2993–2996, 1995. Newell, P.T., Meng, C.-I. Dipole tilt angle effects on the latitude of the cusp and cleft/low latitude boundary layer. J. Geophys. Res. 94, 6949– 6953, 1989. Olson, J.V. ULF signatures of the polar cusp. J. Geophys. Res. 91, 10055–10062, 1986. Olson, J.V., Rostoker, G. Longitudinal phase variations of Pc4–5 micropulsations. J. Geophys. Res. 83, 2481–2488, 1978. Phan, T.D., Escoubet, C.P., Rezeau, L., Treumann, R.A., Vaivads, A., Paschmann, G., Fuselier, S.A., Attie´, D., Rogers, B., Sonnerup, B.U.O¨ . Magnetopause processes. Space Sci. Rev. 118, 367–424, 2005. Pilipenko, V.A., Chugunova, O.M., Engebretson, M.J. Pc3–4 ULF waves at polar latitudes. J. Atmos. Solar-Terr. Phys. 70, 2262–2274, 2008. Russell, C.T. The polar cusp. Adv. Space Res. 25, 1413–1424, 2000. Samson, J.C. Three-dimensional polarization characteristics of high latitude Pc5 geomagnetic micropulsations. J. Geophys. Res. 77, 6145– 6160, 1972. Samson, J.C. Geomagnetic pulsations and plasma waves in the Earth’s magnetosphere, in: Jacobs, J.A. (Ed.), Geomagnetism, vol. 4. Academic Press, pp. 481–592, 1991. Santarelli, L., Lepidi, S., Palangio, P., Cafarella, L. Pc3–Pc4 pulsations at Terra Nova Bay (Antarctica): seasonal dependence of the power and its relation with solar wind parameters. Mem. S.A.It. 74, 766–769, 2003. Santarelli, L., Lepidi, S., Cafarella, L. Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations. Ann. Geophys. 25, 2405–2412, 2007. Sarafopoulos, D.V. Long duration Pc5 compressional pulsations inside the Earth’s magnetotail lobes. Ann. Geophys. 13 (9), 926–937, 1995. Villante, U., Francia, P., Lepidi, S., De Lauretis, M., Pietropaolo, E., Cafarella, L., Meloni, A., Lazarus, A.J., Lepping, R.P., Mariani, F. Geomagnetic field variations at low and high latitude during the January 10–11, 1997 magnetic cloud. Geophys. Res. Lett. 25, 2593– 2596, 1998. Villante, U., Lepidi, S., Francia, P., Vellante, M., Meloni, A., Palangio, P. ULF fluctuations at Terra Nova Bay (Antarctica). Ann. Geofis. 43 (2), 217–227, 2000. Weatherwax, A.T., Rosenberg, T.J., Maclennan, C.G., Doolittle, J.H., et al. Substorm precipitation in the polar cap and associated Pc 5 modulation. Geophys. Res. Lett. 24 (5), 579– 582, 1997. Yagova, N.V., Lanzerotti, L.J., Villante, U., Pilipenko, V.A., Lepidi, S., Francia, P., Papitashvili, V.O., Rodger, A.S. ULF Pc5–6 magnetic activity in the polar cap as observed along a geomagnetic meridian in Antarctica. J.Geophys. Res. 107 (A8), 1195, doi:10.1029/2001JA900143, 2002. Yagova, N.V., Pilipenko, V.A., Lanzerotti, L.J., Engebretson, M.J., Rodger, A.S., Lepidi, S., Papitashvili, V.O. Two-dimensional structure of long-period pulsations at polar latitudes in Antarctica. J. Geophys. Res. 109, A03222, doi:10.1029/2003JA010166, 2004. Zhou, X.W., Russell, C.T., Le, G., Fuselier, S.A., Scudder, J.D. The polar cusp location and its dependence on dipole tilt. Geophys. Res. Lett. 26, 429–432, 1999. Zhou, X.W., Russell, C.T., Le, G., Fuselier, S.A., Scudder, J.D. Solar wind control of the polar cusp at high altitude. J. Geophys. Res. 105, 245–252, 2000. http://hdl.handle.net/2122/7024 doi:10.1016/j.asr.2010.10.027 restricted (2784) Solar wind-magnetosphere interactions (2776) Polar cap phenomena (2752) MHD waves and instabilities 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals article 2011 ftingv https://doi.org/10.1016/j.asr.2010.10.027 https://doi.org/10.1029/2002JA009801 2022-07-29T06:05:58Z A statistical analysis of low frequency geomagnetic fluctuations at the two Antarctic stations Mario Zucchelli Station (geographic coordinates: 74.7 S, 164.1 E; corrected geomagnetic coordinates: 80.0 S, 306.8 E) and Dumont D’Urville (geographic coordinates: 66.7 S, 140.0 E; corrected geomagnetic coordinates: 80.4 S, 236.0 E) is shown. The analysis focuses on power spectra, coherence and phase difference between the stations, which are both located in the polar cap, with a 5-h magnetic local time displacement along a geomagnetic parallel; in this situation, the phase difference between geomagnetic fluctuations indicates the direction of their azimuthal propagation. Coherent fluctuations have been found to occur preferably when both stations are on the same side (dawnward or duskward) with respect to the polar cusp; moreover, around local magnetic midnight, they occur essentially during open magnetospheric conditions. The phase difference for coherent fluctuations indicates a propagation direction away from local geomagnetic noon and midnight. Also the analysis of three individual pulsation events, occurring at different times during the day, is shown; they are characterized at the two stations by simultaneous, coherent fluctuations, whose phase difference finds correspondence with the statistical behaviour. 2010 COSPAR. Published by Elsevier Ltd. All rights reserved. Published 966-977 1.6. Osservazioni di geomagnetismo JCR Journal restricted Article in Journal/Newspaper Antarc* Antarctic Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Antarctic Dumont d’Urville ENVELOPE(140.000,140.000,-66.667,-66.667) Mario Zucchelli ENVELOPE(164.123,164.123,-74.695,-74.695) Mario Zucchelli Station ENVELOPE(164.117,164.117,-74.700,-74.700) Advances in Space Research 47 6 966 977 |