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

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,...

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Published in:	Journal of Geophysical Research: Space Physics
Main Authors:	Alfonsi, Lu., De Franceschi, G., De Santis, A.
Other Authors:	Alfonsi, Lu.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, De Franceschi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia
Format:	Manuscript
Language:	English
Published:	2007
Subjects:	Long term trends polar ionosphere monlinear phenomena 01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous 05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction Antarc* Antarctic Science Antarctica
Online Access:	http://hdl.handle.net/2122/2986

id	ftingv:oai:www.earth-prints.org:2122/2986
record_format	openpolar
institution	Open Polar
collection	Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
op_collection_id	ftingv
language	English
topic	Long term trends polar ionosphere monlinear phenomena 01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous 05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction
spellingShingle	Long term trends polar ionosphere monlinear phenomena 01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous 05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction Alfonsi, Lu. De Franceschi, G. De Santis, A. Geomagnetic and ionospheric data analysis over antarctica: a contribution to the long term trends investigation
topic_facet	Long term trends polar ionosphere monlinear phenomena 01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous 05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction
description	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. In press 3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale JCR Journal open
author2	Alfonsi, Lu.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia De Franceschi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia
format	Manuscript
author	Alfonsi, Lu. De Franceschi, G. De Santis, A.
author_facet	Alfonsi, Lu. De Franceschi, G. De Santis, A.
author_sort	Alfonsi, Lu.
title	Geomagnetic and ionospheric data analysis over antarctica: a contribution to the long term trends investigation
title_short	Geomagnetic and ionospheric data analysis over antarctica: a contribution to the long term trends investigation
title_full	Geomagnetic and ionospheric data analysis over antarctica: a contribution to the long term trends investigation
title_fullStr	Geomagnetic and ionospheric data analysis over antarctica: a contribution to the long term trends investigation
title_full_unstemmed	Geomagnetic and ionospheric data analysis over antarctica: a contribution to the long term trends investigation
title_sort	geomagnetic and ionospheric data analysis over antarctica: a contribution to the long term trends investigation
publishDate	2007
url	http://hdl.handle.net/2122/2986
genre	Antarc* Antarctic Science Antarctica
genre_facet	Antarc* Antarctic Science Antarctica
op_relation	Annales Geophysicae Alfonsi, L., De Franceschi, G., 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, Physics and Chemistry of the 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., Rishbeth, H.: Increased magnetic storm activity from 1868 to 1995, J. Atmos. Solar-Terr. Phys., 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. Clilverd, M. A., Clarke, E., Ulich, T., Linthe, J., 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, Journal of Geophys. Research 107, A10 1303, 2002. Danilov, A. D.: F2 region response to geomagnetic disturbance, J. Atmos. Solar-Terr. Phys., 63, 441-449, 2001. De Franceschi, G., De Santis, A. and Pau, S.: Ionospheric mapping by regional spherical harmonic analysis: new developments, Adv. Space Res.,14, No. 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 , No. 6, 279-282, 1992. De Santis, A., Falcone, C., 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., Gaya-Piqué L.R.: The first Antarctic geomagnetic Reference Model (ARM), Geophys. Res. Lett., 29, No.8, 10.1029/2002GL014675, 2002. De Santis, A., Tozzi, R., Gaya-Piqué, L.R.: Information content and K-entropy of the present geomagnetic field, Earth and Planetary Science Letters, 218, 269-275, 2004. De Santis, A.: How persistent is the present trend of the geomagnetic field to decay and, possibly, to reverse?, Physics of the Earth and Planetary Interiors, 162,217-226, 2007. Gaya-Piqué, L.R., Ravat, D., De Santis, A., Torta, J.M.: New model alternatives for improving the representation of the core magnetic field of Antarctica, Antarctic Science, 18(1), 101-109, 2006. Gubbins D., Mechanism for geomagnetic polarity reversals, Nature, 326, 167-169, 1987. Gubbins, D., Jones, A. L., 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. Atm. Sol.-Terr. Phys., 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. Atm. Sol.-Terr. Phys., 68/17, 1854-1870, 2006. Lookwood, M. and Stamper, R.: Long-term drift of the coronal source magnetic flux and the total solar irradiance, Geophys. Res. Lett. 26, 2461, 1999.De San Lowes, F.J.: Mean square values on the sphere of spherical harmonic vector fields, J. Geophys. Res., 71, 2179, 1966.A., Torta J.M., Gaya-Piqué L.R., GRL, 29, No.8, 10.10 Macmillan, S., Maus, S.: International Geomagnetic Reference Field – the tenth generation, Earth Planets Space, 57, 1135-1140, 2005. Mikhailov A. V., Marin, D.: Geomagnetic control of the f0F2 long-term trends, Ann. Geophysicae 18, 653-665, 2000. Mursula, K., Martini, D.: Centennial increase in geomagnetic activity: Latitudinal differences and global estimates, J. Geophys. Res., 111, A08209, doi:10.1029/2005JA011549, 2006. Perrone, L. and De Franceschi, G.: A correlation study between time-weighted magnetic indices and the high-latitude ionosphere, Physics and Chemistry of the Earth 24, 389-392, 1999. Perrone, L., De Franceschi, G. and Gulyaeva, T.: The time-weighted magnetic indices ap(t), PC(t) and AE(t) and their correlation to the southern high latitude ionosphere, Physics and Chemistry of the Earth 26/5, 331-334, 2001. Piggott, W. R., Rawer, K.: U.R.S.I. Handbook of Ionogram Interpretation and Reduction, World Data Center A for Solar-Terrestrial Physics, NOAA, Boulder, Colorado, 1972. Rajaram, G., Arun, T., Dhar, A., Patil, A. G.: Rapid decrease in total magnetic field F at Antarctic stations-its relationship to core-mantle features, Antarctic Science, 14(1), 61-68, 2002. Richardson, I. G., Cliver, E. W. and Cane, H. V., Long-term trends in interplanetary magnetic field strength and solar wind structure during the twentieth century, J. of Geophys. Res. 107 A10, 1304, 2002. Rishbeth, H., The quadrupole ionosphere, Ann Geophys, 3, 293– 298, 1985. Rishbeth, H., Long-term changes in the ionosphere, Adv. Space Phys., 20, 2149– 2155, 1997. Shannon, C.: A mathematical theory of communication, Bell Syst. Tech. J., 27, 379-423, 623-656, 1948. Svalgaard, L., Cliver, E., W., Le Sager, P.: IHV : A new long-term geomagnetic index, Adv. Space Res., 34, 436-439, 2004. Ulich, T., Clilverd, M. A., Rishbeth, H., Determining Long-Term Change in the Ionosphere EOS, Transactions American Geophysical Union, 84, 52, 581, 2003. Wrenn, G. L.: Time-Wighted Accumulations ap(t) and Kp(t). J. Geophys. Res., 92, 125-129, 1987. Wu, J., and Wilkinson, P. J.: Time-weighted indices as predictors of ionospheric behaviour. J. Atmos. Terr. Phys., 57, 1736-1770, 1995. http://hdl.handle.net/2122/2986
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container_title	Journal of Geophysical Research: Space Physics
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spelling	ftingv:oai:www.earth-prints.org:2122/2986 2023-05-15T13:51:39+02:00 Geomagnetic and ionospheric data analysis over antarctica: a contribution to the long term trends investigation Alfonsi, Lu. De Franceschi, G. De Santis, A. Alfonsi, Lu.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia De Franceschi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia 2007 http://hdl.handle.net/2122/2986 en eng Annales Geophysicae Alfonsi, L., De Franceschi, G., 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, Physics and Chemistry of the 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., Rishbeth, H.: Increased magnetic storm activity from 1868 to 1995, J. Atmos. Solar-Terr. Phys., 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. Clilverd, M. A., Clarke, E., Ulich, T., Linthe, J., 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, Journal of Geophys. Research 107, A10 1303, 2002. Danilov, A. D.: F2 region response to geomagnetic disturbance, J. Atmos. Solar-Terr. Phys., 63, 441-449, 2001. De Franceschi, G., De Santis, A. and Pau, S.: Ionospheric mapping by regional spherical harmonic analysis: new developments, Adv. Space Res.,14, No. 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 , No. 6, 279-282, 1992. De Santis, A., Falcone, C., 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., Gaya-Piqué L.R.: The first Antarctic geomagnetic Reference Model (ARM), Geophys. Res. Lett., 29, No.8, 10.1029/2002GL014675, 2002. De Santis, A., Tozzi, R., Gaya-Piqué, L.R.: Information content and K-entropy of the present geomagnetic field, Earth and Planetary Science Letters, 218, 269-275, 2004. De Santis, A.: How persistent is the present trend of the geomagnetic field to decay and, possibly, to reverse?, Physics of the Earth and Planetary Interiors, 162,217-226, 2007. Gaya-Piqué, L.R., Ravat, D., De Santis, A., Torta, J.M.: New model alternatives for improving the representation of the core magnetic field of Antarctica, Antarctic Science, 18(1), 101-109, 2006. Gubbins D., Mechanism for geomagnetic polarity reversals, Nature, 326, 167-169, 1987. Gubbins, D., Jones, A. L., 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. Atm. Sol.-Terr. Phys., 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. Atm. Sol.-Terr. Phys., 68/17, 1854-1870, 2006. Lookwood, M. and Stamper, R.: Long-term drift of the coronal source magnetic flux and the total solar irradiance, Geophys. Res. Lett. 26, 2461, 1999.De San Lowes, F.J.: Mean square values on the sphere of spherical harmonic vector fields, J. Geophys. Res., 71, 2179, 1966.A., Torta J.M., Gaya-Piqué L.R., GRL, 29, No.8, 10.10 Macmillan, S., Maus, S.: International Geomagnetic Reference Field – the tenth generation, Earth Planets Space, 57, 1135-1140, 2005. Mikhailov A. V., Marin, D.: Geomagnetic control of the f0F2 long-term trends, Ann. Geophysicae 18, 653-665, 2000. Mursula, K., Martini, D.: Centennial increase in geomagnetic activity: Latitudinal differences and global estimates, J. Geophys. Res., 111, A08209, doi:10.1029/2005JA011549, 2006. Perrone, L. and De Franceschi, G.: A correlation study between time-weighted magnetic indices and the high-latitude ionosphere, Physics and Chemistry of the Earth 24, 389-392, 1999. Perrone, L., De Franceschi, G. and Gulyaeva, T.: The time-weighted magnetic indices ap(t), PC(t) and AE(t) and their correlation to the southern high latitude ionosphere, Physics and Chemistry of the Earth 26/5, 331-334, 2001. Piggott, W. R., Rawer, K.: U.R.S.I. Handbook of Ionogram Interpretation and Reduction, World Data Center A for Solar-Terrestrial Physics, NOAA, Boulder, Colorado, 1972. Rajaram, G., Arun, T., Dhar, A., Patil, A. G.: Rapid decrease in total magnetic field F at Antarctic stations-its relationship to core-mantle features, Antarctic Science, 14(1), 61-68, 2002. Richardson, I. G., Cliver, E. W. and Cane, H. V., Long-term trends in interplanetary magnetic field strength and solar wind structure during the twentieth century, J. of Geophys. Res. 107 A10, 1304, 2002. Rishbeth, H., The quadrupole ionosphere, Ann Geophys, 3, 293– 298, 1985. Rishbeth, H., Long-term changes in the ionosphere, Adv. Space Phys., 20, 2149– 2155, 1997. Shannon, C.: A mathematical theory of communication, Bell Syst. Tech. J., 27, 379-423, 623-656, 1948. Svalgaard, L., Cliver, E., W., Le Sager, P.: IHV : A new long-term geomagnetic index, Adv. Space Res., 34, 436-439, 2004. Ulich, T., Clilverd, M. A., Rishbeth, H., Determining Long-Term Change in the Ionosphere EOS, Transactions American Geophysical Union, 84, 52, 581, 2003. Wrenn, G. L.: Time-Wighted Accumulations ap(t) and Kp(t). J. Geophys. Res., 92, 125-129, 1987. Wu, J., and Wilkinson, P. J.: Time-weighted indices as predictors of ionospheric behaviour. J. Atmos. Terr. Phys., 57, 1736-1770, 1995. http://hdl.handle.net/2122/2986 open Long term trends polar ionosphere monlinear phenomena 01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous 05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction manuscript 2007 ftingv https://doi.org/10.1029/2001JA000501 2022-07-29T06:04:38Z 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. In press 3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale JCR Journal open Manuscript Antarc* Antarctic Science Antarctica Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Journal of Geophysical Research: Space Physics 107 A12 SSH 4-1 SSH 4-7

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

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