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Daily variation at Concordia station (Antarctica) and its dependence on IMF conditions
Author(s)
Language
English
Obiettivo Specifico
3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale
1.6. Osservazioni di geomagnetismo
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/ 25 (2007)
Publisher
Copernicus
Pages (printed)
2045–2051
Issued date
2007
Abstract
After some short test surveys, during the
2004–2005 summer expedition in Antarctica, a geomagnetic
French-Italian observatory was installed on the plateau (geographic
coordinates: 75.1 S, 123.4 E; corrected geomagnetic
coordinates: 88.9 S, 54.3 E; UT=LT−8) very close to
the geomagnetic pole. In this paper we present some peculiarities
of the daily variation as observed at this polar cap
observatory during the years 2005 and 2006, taking into account
the different Loyd seasons and different interplanetary
magnetic field conditions. Some interesting results emerge
from the analysis, confirming the dependence of the daily
variation (and of the associated polar current systems) on
the IMF Bz and By components. In particular the analysis
showed that different Bz conditions correspond to different
contribution to daily variation of ionospheric and field
aligned currents, while particular By conditions lead to a time
shift of the diurnal variation, indicating an asymmetry with
respect to the noon meridian.
2004–2005 summer expedition in Antarctica, a geomagnetic
French-Italian observatory was installed on the plateau (geographic
coordinates: 75.1 S, 123.4 E; corrected geomagnetic
coordinates: 88.9 S, 54.3 E; UT=LT−8) very close to
the geomagnetic pole. In this paper we present some peculiarities
of the daily variation as observed at this polar cap
observatory during the years 2005 and 2006, taking into account
the different Loyd seasons and different interplanetary
magnetic field conditions. Some interesting results emerge
from the analysis, confirming the dependence of the daily
variation (and of the associated polar current systems) on
the IMF Bz and By components. In particular the analysis
showed that different Bz conditions correspond to different
contribution to daily variation of ionospheric and field
aligned currents, while particular By conditions lead to a time
shift of the diurnal variation, indicating an asymmetry with
respect to the noon meridian.
References
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current system using the IMS meridian chains of magnetometers,
Space Sci. Rev., 36, 337–413, 1983.
Brekke, A.: Physics of the upper polar atmosphere, John Wiley &
Sons Ltd in association with Praxis Publishing Ltd, p. 491, 1997.
Burch, J. L.: Rate of erosion of dayside magnetic flux based on
a quantitative study of polar cusp latitude on the interplanetary
magnetic field, Eos T. Am. Geophys. Un., 54, 1286–1286, 1973.
Friis-Christensen, E. and Wilhjelm, J.: Polar cap currents for different
directions of the interplanetary magnetic field in the Y-Z
plane, J. Geophys. Res., 80, 1248–1260, 1975.
Kivelson, M. G. and Russell, C. T.: Introduction to Space Physics,
Cambridge University Press, p. 568, 1996.
Iijima, T.: Field-aligned currents in geospace: substance and significance,
Magnetospheric Current Systems, edited by: Ohtani,
S.-I., Fujii, R., Hesse, M., Lysak, R. L., Gephysical Monograph,
118, 107–129, 2000.
Lanzerotti, L. J., Meclennan, L. V., and Medford, L. V.: Inferred
quasi-steady ionospheric neutral winds and electrical currents at
79 south latitude in austral summer condition, Geophys. Res.
Lett., 21, 217–220, 1994.
Lepidi, S., Cafarella, L., Francia, P., Meloni, A., Palangio, P.,
and Schott, J. J.: Low frequency geomagnetic field variations
at Dome C (Antartica), Ann. Geophys., 21, 923–932, 2003,
http://www.ann-geophys.net/21/923/2003/.
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.
Nishida, A.: Geomagnetic diagnosis of the magnetosphere,
Springer-Verlag, 1978.
Park, K. S., Ogino, T., and Walker, R. J.: On the importance
of antiparallel reconnection when the dipole tilt
and IMF By are nonzero, J. Geophys. Res., 111, A05202,
doi:10.1029/2004JA010972, 2006.
Ratcliffe, J. A.: An introduction to the ionosphere and magnetosphere,
Com. Uni Press, Cambridge, p. 256, 1972.
Santarelli, L., Cafarella, L., Lepidi, S., Di Mauro, D., Meloni, A.,
and Palangio, P.: Fourteen years of geomagnetic daily variation
at Mario Zucchelli Station (Antarctica), Ann. Geophys.-Italy, 50,
227–234, 2007.
Stubbs, T. J., Lockwood, M., Cargill, P., Fennell, J., Grande, M.,
Kellett, B., Perry, C., and Rees, A.: Dawn-dusk asymmetry in
particles of solar wind origin within the magnetosphere, Ann.
Geophys., 19, 1–9, 2001,
http://www.ann-geophys.net/19/1/2001/.
Vennerstrom, S., Moretto, T., Olsen, N., Friis-Christensen, E., and
Stampe, A. M.: Field aligned currents in the dayside cusp and
polar cap region during northward IMF, J. Geophys. Res., 107,
A009162, doi:10.1029/2001JA009162, 2002.
Vennerstrom, S., Moretto, T., Rastatter, L., and Raeder, J.:
Field-aligned currents during northward interplanetary magnetic
field: Morphology and causes, J. Geophys. Res., 110, A06205,
doi:10.1029/2004JA010802, 2005.
Villante, U., Lepidi, S., Francia, P., Meloni A., and Palangio, P.:
Long period geomagnetic field fluctuations at Terra Nova Bay
(Antarctica), Geophys. Res. Lett., 24, 1443–1446, 1997.
Yagova, N. V., Lanzerotti, L. J., Villante, U., Pilipenko, V. A., Lepidi,
S., Francia, P., Papitashvili, V. O., and Rodger, A. S.: ULF Pc5-6 magnetic activity in the polar cap as observed along a geomagnetic
meridian in Antarctica, J. Geophys. Res., 107, SMP22,
doi:10.1029/2001JA900143, 2002.
Yagova, N. V., Pilipenko, V. A., Lanzerotti, L. J., Engebretson,
M. J., Rodger, A. S., Lepidi S., and 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 Fuselier, S. A., and Scudder, J. D.:
Solar wind control of the polar cusp at high altitude, J. Geophys.
Res., 105, 245–251, doi:10.1029/1999JA900412, 2000.
current system using the IMS meridian chains of magnetometers,
Space Sci. Rev., 36, 337–413, 1983.
Brekke, A.: Physics of the upper polar atmosphere, John Wiley &
Sons Ltd in association with Praxis Publishing Ltd, p. 491, 1997.
Burch, J. L.: Rate of erosion of dayside magnetic flux based on
a quantitative study of polar cusp latitude on the interplanetary
magnetic field, Eos T. Am. Geophys. Un., 54, 1286–1286, 1973.
Friis-Christensen, E. and Wilhjelm, J.: Polar cap currents for different
directions of the interplanetary magnetic field in the Y-Z
plane, J. Geophys. Res., 80, 1248–1260, 1975.
Kivelson, M. G. and Russell, C. T.: Introduction to Space Physics,
Cambridge University Press, p. 568, 1996.
Iijima, T.: Field-aligned currents in geospace: substance and significance,
Magnetospheric Current Systems, edited by: Ohtani,
S.-I., Fujii, R., Hesse, M., Lysak, R. L., Gephysical Monograph,
118, 107–129, 2000.
Lanzerotti, L. J., Meclennan, L. V., and Medford, L. V.: Inferred
quasi-steady ionospheric neutral winds and electrical currents at
79 south latitude in austral summer condition, Geophys. Res.
Lett., 21, 217–220, 1994.
Lepidi, S., Cafarella, L., Francia, P., Meloni, A., Palangio, P.,
and Schott, J. J.: Low frequency geomagnetic field variations
at Dome C (Antartica), Ann. Geophys., 21, 923–932, 2003,
http://www.ann-geophys.net/21/923/2003/.
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.
Nishida, A.: Geomagnetic diagnosis of the magnetosphere,
Springer-Verlag, 1978.
Park, K. S., Ogino, T., and Walker, R. J.: On the importance
of antiparallel reconnection when the dipole tilt
and IMF By are nonzero, J. Geophys. Res., 111, A05202,
doi:10.1029/2004JA010972, 2006.
Ratcliffe, J. A.: An introduction to the ionosphere and magnetosphere,
Com. Uni Press, Cambridge, p. 256, 1972.
Santarelli, L., Cafarella, L., Lepidi, S., Di Mauro, D., Meloni, A.,
and Palangio, P.: Fourteen years of geomagnetic daily variation
at Mario Zucchelli Station (Antarctica), Ann. Geophys.-Italy, 50,
227–234, 2007.
Stubbs, T. J., Lockwood, M., Cargill, P., Fennell, J., Grande, M.,
Kellett, B., Perry, C., and Rees, A.: Dawn-dusk asymmetry in
particles of solar wind origin within the magnetosphere, Ann.
Geophys., 19, 1–9, 2001,
http://www.ann-geophys.net/19/1/2001/.
Vennerstrom, S., Moretto, T., Olsen, N., Friis-Christensen, E., and
Stampe, A. M.: Field aligned currents in the dayside cusp and
polar cap region during northward IMF, J. Geophys. Res., 107,
A009162, doi:10.1029/2001JA009162, 2002.
Vennerstrom, S., Moretto, T., Rastatter, L., and Raeder, J.:
Field-aligned currents during northward interplanetary magnetic
field: Morphology and causes, J. Geophys. Res., 110, A06205,
doi:10.1029/2004JA010802, 2005.
Villante, U., Lepidi, S., Francia, P., Meloni A., and Palangio, P.:
Long period geomagnetic field fluctuations at Terra Nova Bay
(Antarctica), Geophys. Res. Lett., 24, 1443–1446, 1997.
Yagova, N. V., Lanzerotti, L. J., Villante, U., Pilipenko, V. A., Lepidi,
S., Francia, P., Papitashvili, V. O., and Rodger, A. S.: ULF Pc5-6 magnetic activity in the polar cap as observed along a geomagnetic
meridian in Antarctica, J. Geophys. Res., 107, SMP22,
doi:10.1029/2001JA900143, 2002.
Yagova, N. V., Pilipenko, V. A., Lanzerotti, L. J., Engebretson,
M. J., Rodger, A. S., Lepidi S., and 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 Fuselier, S. A., and Scudder, J. D.:
Solar wind control of the polar cusp at high altitude, J. Geophys.
Res., 105, 245–251, doi:10.1029/1999JA900412, 2000.
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