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Geomagnetic and Ionospheric Data Analysis Over Antarctica: a Contribution to the Long Term Trends Investigation : Volume 26, Issue 5 (28/05/2008)

By Alfonsi, L.

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Book Id: WPLBN0004001719
Format Type: PDF Article :
File Size: Pages 7
Reproduction Date: 2015

Title: Geomagnetic and Ionospheric Data Analysis Over Antarctica: a Contribution to the Long Term Trends Investigation : Volume 26, Issue 5 (28/05/2008)  
Author: Alfonsi, L.
Volume: Vol. 26, Issue 5
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Franceschi, G. D., Santis, A. D., & Alfonsi, L. (2008). Geomagnetic and Ionospheric Data Analysis Over Antarctica: a Contribution to the Long Term Trends Investigation : Volume 26, Issue 5 (28/05/2008). Retrieved from http://members.worldlibrary.net/


Description
Description: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, 00143 Rome, Italy. The analysis of the foF2 ionosonde data acquired at mid and high latitudes reveals a general decreasing of the F2 plasma frequency over more than two solar cycles, showing steeper trends over the high latitude stations and, in particular, over Antarctica. A careful analysis of the foF2 hourly data, opportunely catalogued in different levels of magneto-ionospheric conditions, highlights the role of the geomagnetic activity in the secular change of the ionosphere and confirms the latitudinal dependence of the trends. These results suggest interesting relations with some recent findings on the rapid decrease of some important physical and statistical quantities related to the geomagnetic field over the whole globe and mainly in Antarctica. In this paper we discuss the possibility of a connection between the ionospheric trends and a possible imminent geomagnetic reversal or excursion.

Summary
Geomagnetic and ionospheric data analysis over Antarctica: a contribution to the long term trends investigation

Excerpt
Alfonsi, L., De Franceschi, G., and Perrone, L.: Long-term trend in the high latitude ionosphere, Physics and Chemistry of the Earth 26/5, 303-307, 2001.; Alfonsi, L., De Franceschi, G., Perrone, L., Materassi, M.: Long term trends of the critical frequency of the f2 layer at northern and southern high latitude regions, Phys. Chem. Earth, 27/6-8, 595–600, 2002.; Bremer, J.: Ionospheric trends in mid-latitudes as a possible indicator of the atmospheric greenhouse effect, J. Atmos. Terr. Phys., 54, 1505–1511, 1992.; Bremer, J.: Long-term trends in different ionospheric layers, Radio Science Bulletin, 315, 22–32, 2005.; Clilverd, M. A., Clark, T. D. G., Clarke, E., and Rishbeth, H.: Increased magnetic storm activity from 1868 to 1995, J. Atmos. Sol.-Terr. Phy., 60, 1047–1056, 1998.; Clilverd, M. A., Clark, T. D. G., Clarke, E., Rishbeth, H., and Ulich, T.: The causes of long-term change in the aa index, J. Geophys. Res., 107(A12), 1441, doi:10.1029/2001JA000501, 2002.; Danilov, A. D.: F2 region response to geomagnetic disturbance, J. Atmos. Sol.-Terr. Phy., 63, 441–449, 2001.; Clilverd, M. A., Clarke, E., Ulich, T., Linthe, J., and Rishbeth, H.: Reconstructing the long-term aa index, J. Geophys. Res., 110, A07205, doi:10.1029/2004JA010762, 2005.; Cliver, E. W. and Ling, A. G.: Secular change in geomagnetic indices and the solar open magnetic flux during the first half of the twentieth century, J. Geophys. Res., 107(A10), 1303, 2002.; De Franceschi, G., De Santis, A., and Pau, S.: Ionospheric mapping by regional spherical harmonic analysis: new developments, Adv. Space Res., 14(12), 61–64, 1994.; De Franceschi, G., Gulyaeva, T. L., Perrone, L., and Zolesi, B.: MAC: An Oriented Magnetic Activity Catalogue for Ionospheric Applications, U.R.S.I. International Reference Ionosphere News Letter, 6/4, 5–6, 1999.; De Franceschi, G., Gulyaeva, T. L., Perrone, L., and Zolesi, B.: A statistical analysis of ionospheric irregularities at mid and high latitudes, Inverse Problems, 18, 67–78, 2002.; De Santis, A., De Franceschi, G., Zolesi, B., and Cander, Lj. R.: Regional modelling and mapping of the ionospheric characteristic parameters by Spherical Cap Harmonic Expansion, Adv. Space Res., 12(6), 279–282, 1992.; De Santis, A., Falcone, C., and Lowes, F. J.: Remarks on the mean-square values of the geomagnetic field and its components, Annali di Geofisica, 38(2), 167–175, 1995.; De Santis, A., Torta, J. M., and Gaya-Piqué, L. R.: The first Antarctic geomagnetic Reference Model (ARM), Geophys. Res. Lett., 29(8), 1192, doi:10.1029/2002GL014675, 2002.; De Santis, A., Tozzi, R., and Gaya-Piqué, L. R.: Information content and $K$-entropy of the present geomagnetic field, Earth Planet. Sci. Lett., 218, 269–275, 2004.; De Santis, A.: How persistent is the present trend of the geomagnetic field to decay and, possibly, to reverse?, Phys. Earth Planet. In., 162, 217–226, 2007.; Gaya-Piqué, L. R., Ravat, D., De Santis, A., and Torta, J. M.: New model alternatives for improving the representation of the core magnetic field of Antarctica, Antarct. Sci., 18(1), 101–109, 2006.; Gubbins D.: Mechanism for geomagnetic polarity reversals, Nature, 326, 167–169, 1987.; Gubbins, D., Jones, A. L., and Finlay, C. C.: Fall in Earth's magnetic field is erratic, Science, 312, 900–902, 2006.; Gulyaeva, T. L.: Forecast of recurrent magnetic storms one day in advance, Geomagnetism and Aeronomy, 42(N2), 169–174, 2002.; Lastovicka, J.: On the role of solar and geomagnetic activiy in long-term trends in the atmosphere-ionosphere system, J. Atmos. Sol.-Terr. Phy., 67, 83–92, 2005.; Lastovicka, J., Mikhailov, A. V., Ulich, Th., Bremer, J., Elias, A. G., Ortiz de Adler, N., Jara, V., Abarca del Rio, R., Foppiano, A. J., Ovalle, E., and Danilov, A. D.: Long-term trends in foF2: A comparison of various methods, J.

 

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