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The contribution of geomagnetic observatories and magnetic models to the study of secular variation and jerks in Antarctica
Author(s)
Language
English
Obiettivo Specifico
3.4. Geomagnetismo
Status
Published
JCR Journal
N/A or not JCR
Peer review journal
Yes
Title of the book
Issue/vol(year)
/ Short Research Paper 071 (2007)
Publisher
USGS
Pages (printed)
on line only
Issued date
2007
Alternative Location
Abstract
Some of the most interesting features of the geomagnetic field and its time variations are displayed in polar
areas. Observatory monthly means usually provide an excellent opportunity to study the temporal changes of the
magnetic field at a given location. Unfortunately, on the Antarctic continent the distribution of the permanent ground-
based observatories does not permit a uniform coverage of the examined area. Furthermore, the magnetic records are
characterized by intense external disturbances and noise that make the analysis of the magnetic field difficult. To improve our knowledge of the secular variation and detect the presence of secular variation impulses (geomagnetic
jerks) in Antarctica, we use both observatory data and the CM4 quiet time magnetic field model. In particular CM4
improves our knowledge of geomagnetic jerks over Antarctica through the study of the sign changes of the secular
acceleration maps.
areas. Observatory monthly means usually provide an excellent opportunity to study the temporal changes of the
magnetic field at a given location. Unfortunately, on the Antarctic continent the distribution of the permanent ground-
based observatories does not permit a uniform coverage of the examined area. Furthermore, the magnetic records are
characterized by intense external disturbances and noise that make the analysis of the magnetic field difficult. To improve our knowledge of the secular variation and detect the presence of secular variation impulses (geomagnetic
jerks) in Antarctica, we use both observatory data and the CM4 quiet time magnetic field model. In particular CM4
improves our knowledge of geomagnetic jerks over Antarctica through the study of the sign changes of the secular
acceleration maps.
References
Alexandrescu, M., D. Gibert, G. Hulot, J.L. Le Mouël, and G. Saracco (1996), Worldwide wavelet analysis of geomagnetic jerks, J. Geophys. Res., 101, 21975-21994. Bloxham, J., S. Zatman and M. Dumberry (2002), The origin of geomagnetic jerks, Nature, 420, 65-68. Chambodut, A, and M. Mandea (2005), Evidence for geomagnetic jerks in comprehensive models, Earth Planets Space, 57, 139-149. Chambodut, A, M. Mandea, and C. Eymin (2005), Geomagnetic jerks detected from comprehensive magnetic field models, Geophys. Res. Abstracts, 7, 05165. Courtillot, V., J. Ducruix, and J.L. Le Mouël (1978), Sur une
accélération récente de la variation séculaire du champ magnétique terrestre, C.R. Acad. Sci. Ser. D, 287, 1095-1098. De Michelis, P., L. Cafarella, and A. Meloni (2000), A global analysis of the 1991 geomagnetic jerk, Geophys. J. Int., 143, 545-556. De Michelis, P., and R. Tozzi (2005), A local intermittency measure
(LIM) approach to the detection of geomagnetic jerks, Earth Planet. Sci. Lett., 235, 261-272.
De Santis, A., R. Tozzi, and L. Gaya-Piqué (2004), Information Content
and K-entropy of the Present Earth Magnetic Field, Earth Planet. Sci. Lett., 218, 269-275. Gubbins, D., A. L. Jones, and C.C. Finlay (2006), Fall in Earth’s magnetic field is erratic, Science, 312, 900-902. Kerridge, D. (2001), Intermagnet: worldwide near-real-time geomagnetic observatory data, Proceedings of the Workshop on Space Weather, ESTEC.
Lepidi, S., L. Cafarella, P. Francia, A. Meloni, P. Palangio, and J. J. Schott (2003), Low frequency geomagnetic field variations at Dome C (Antarctica), Annales Geophysicae, 21, 923–932. Macmillan, S. (1996), A geomagnetic jerk for the early 1990’s, Earth Planet. Sci. Lett., 137, 189-192. Malin, S.R.C., and B.M. Hodder (1982), Was the 1970 geomagnetic jerk of internal or external origin?, Nature, 296, 726-728. MacMillan, S. and S. Maus (2005), International Geomagnetic
Reference Field – the tenth generation, Earth Planets and Space, 57,
1135-1140.
Mandea, M., E. Bellanger, and J.L. Le Mouël (2000), A geomagnetic jerk for the end of the 20th century?, Earth Planet. Sci. Lett., 183, 369-
373. Mandea, M., and B. Langlais (2002), Observatory crustal magnetic biases during MAGSAT and Ørsted satellite missions, Geophys. Res.
Lett., 29, 10.1029/2001GL013693. Meloni, A., L. R. Gaya-Piqué, P. De Michelis, and A. De Santis (2006),
Some recent characteristics of geomagnetic secular variations in Antarctica, from: Fütterer D.K. at al. (eds) Antarctica: Contributions
to global earth sciences, Spring-Verlag, Berlin Heidelberg New York, 377-382. Nagao, H., T. Iyemori, T. Higuchi, and T. Araki (2003), Lower mantle conductivity anomalies estimated from geomagnetic jerks, J. Geophys.
Res., 108, 2254, doi: 10.1029/2002JB001786. Olsen, N., and M. Mandea (2007), Investigation of a secular variation impulse using satellite data: the 2003 geomagnetic jerk, Earth Planet.
Sci. Lett., 255, 94-105.
Rajaram, G., T. Arun, A. Dhar, and G. Patil (2002), Rapid decrease in total magnetic field F at Antarctic stations – its relationship to core-
mantle features, Antarctic Sci., 14, 61-68.
Sabaka, T., N. Olsen, and M. E. Purucker (2004), Extending comprehensive models of the Earth’s magnetic field with Ørsted and CHAMP data, Geophys. J. Int., 159, 521-547.
Waddington, R., D. Gubbins, and N. Barber (1995), Geomagnetic field analysis-V. Determining steady core-surface flows directly from geomagnetic observations, Geophys. J. Int., 122, 326-350.
accélération récente de la variation séculaire du champ magnétique terrestre, C.R. Acad. Sci. Ser. D, 287, 1095-1098. De Michelis, P., L. Cafarella, and A. Meloni (2000), A global analysis of the 1991 geomagnetic jerk, Geophys. J. Int., 143, 545-556. De Michelis, P., and R. Tozzi (2005), A local intermittency measure
(LIM) approach to the detection of geomagnetic jerks, Earth Planet. Sci. Lett., 235, 261-272.
De Santis, A., R. Tozzi, and L. Gaya-Piqué (2004), Information Content
and K-entropy of the Present Earth Magnetic Field, Earth Planet. Sci. Lett., 218, 269-275. Gubbins, D., A. L. Jones, and C.C. Finlay (2006), Fall in Earth’s magnetic field is erratic, Science, 312, 900-902. Kerridge, D. (2001), Intermagnet: worldwide near-real-time geomagnetic observatory data, Proceedings of the Workshop on Space Weather, ESTEC.
Lepidi, S., L. Cafarella, P. Francia, A. Meloni, P. Palangio, and J. J. Schott (2003), Low frequency geomagnetic field variations at Dome C (Antarctica), Annales Geophysicae, 21, 923–932. Macmillan, S. (1996), A geomagnetic jerk for the early 1990’s, Earth Planet. Sci. Lett., 137, 189-192. Malin, S.R.C., and B.M. Hodder (1982), Was the 1970 geomagnetic jerk of internal or external origin?, Nature, 296, 726-728. MacMillan, S. and S. Maus (2005), International Geomagnetic
Reference Field – the tenth generation, Earth Planets and Space, 57,
1135-1140.
Mandea, M., E. Bellanger, and J.L. Le Mouël (2000), A geomagnetic jerk for the end of the 20th century?, Earth Planet. Sci. Lett., 183, 369-
373. Mandea, M., and B. Langlais (2002), Observatory crustal magnetic biases during MAGSAT and Ørsted satellite missions, Geophys. Res.
Lett., 29, 10.1029/2001GL013693. Meloni, A., L. R. Gaya-Piqué, P. De Michelis, and A. De Santis (2006),
Some recent characteristics of geomagnetic secular variations in Antarctica, from: Fütterer D.K. at al. (eds) Antarctica: Contributions
to global earth sciences, Spring-Verlag, Berlin Heidelberg New York, 377-382. Nagao, H., T. Iyemori, T. Higuchi, and T. Araki (2003), Lower mantle conductivity anomalies estimated from geomagnetic jerks, J. Geophys.
Res., 108, 2254, doi: 10.1029/2002JB001786. Olsen, N., and M. Mandea (2007), Investigation of a secular variation impulse using satellite data: the 2003 geomagnetic jerk, Earth Planet.
Sci. Lett., 255, 94-105.
Rajaram, G., T. Arun, A. Dhar, and G. Patil (2002), Rapid decrease in total magnetic field F at Antarctic stations – its relationship to core-
mantle features, Antarctic Sci., 14, 61-68.
Sabaka, T., N. Olsen, and M. E. Purucker (2004), Extending comprehensive models of the Earth’s magnetic field with Ørsted and CHAMP data, Geophys. J. Int., 159, 521-547.
Waddington, R., D. Gubbins, and N. Barber (1995), Geomagnetic field analysis-V. Determining steady core-surface flows directly from geomagnetic observations, Geophys. J. Int., 122, 326-350.
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