Options
Geomagnetic and ionospheric data analysis over Antarctica: a contribution to the long term trends investigation
Language
English
Obiettivo Specifico
3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
5 / 26 (2008)
Publisher
EGU - Copernicus Publications
Pages (printed)
1173-1179
Issued date
2008
Alternative Location
Abstract
The analysis of the f oF2 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 f oF2 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.
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.
References
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.
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.
Danilov, A. D.: F2 region response to geomagnetic disturbance, J.
Atmos. Sol.-Terr. Phy., 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(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 meansquare
values of the geomagnetic field and its components, Annali
di Geofisica, 38(2), 167–175, 1995.
De Santis, A., Torta, J. M., and Gaya-Piqu´e, 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-Piqu´e, 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-Piqu´e, 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 longterm
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. Atmos. Sol.-Terr. Phy., 68/17,
1854–1870, 2006.
Lockwood, M. and Stamper, R.: Long-term drift of the coronal
source magnetic flux and the total solar irradiance, Geophys. Res.
Lett., 26, 2461–2464, 1999.
Lowes, F. J.: Mean square values on the sphere of spherical har-monic vector fields, J. Geophys. Res., 71, 2179, 1966.
Macmillan, S. and Maus, S.: International Geomagnetic Reference
Field – the tenth generation, Earth Planets Space, 57, 1135–1140,
2005.
Mikhailov, A. V. and Marin, D.: Geomagnetic control of the f0F2
long-term trends, Ann. Geophys. 18, 653–665, 2000.
Mursula, K. and 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,
Phys. Chem. Earth, 24, 389–392, 1999.
Perrone, L., De Franceschi, G., and Gulyaeva, T.: The timeweighted
magnetic indices ap( ), PC( ) and AE( ) and their
correlation to the southern high latitude ionosphere, Phys. Chem.
Earth, 26/5, 331–334, 2001.
Piggott, W. R. and 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., and Patil, A. G.: Rapid decrease
in total magnetic field F at Antarctic stations-its relationship to
core-mantle features, Antarct. Sci., 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. Geophys. Res., 107(A10), 1304,
doi:10.1029/2001JA000507, 2002.
Rishbeth, H.: The quadrupole ionosphere, Ann. Geophys., 3, 293–
298, 1985,
http://www.ann-geophys.net/3/293/1985/.
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., and Le Sager, P.: IHV : A new longterm
geomagnetic index, Adv. Space Res., 34, 436–439, 2004.
Ulich, T., Clilverd, M. A., and 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( ) and Kp( ), J.
Geophys. Res., 92, 125–129, 1987.
Wu, J. and Wilkinson, P. J.: Time-weighted indices as predictors
of ionospheric behaviour, J. Atmos. Terr. Phy., 57, 1736–1770,
1995.
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.
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.
Danilov, A. D.: F2 region response to geomagnetic disturbance, J.
Atmos. Sol.-Terr. Phy., 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(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 meansquare
values of the geomagnetic field and its components, Annali
di Geofisica, 38(2), 167–175, 1995.
De Santis, A., Torta, J. M., and Gaya-Piqu´e, 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-Piqu´e, 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-Piqu´e, 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 longterm
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. Atmos. Sol.-Terr. Phy., 68/17,
1854–1870, 2006.
Lockwood, M. and Stamper, R.: Long-term drift of the coronal
source magnetic flux and the total solar irradiance, Geophys. Res.
Lett., 26, 2461–2464, 1999.
Lowes, F. J.: Mean square values on the sphere of spherical har-monic vector fields, J. Geophys. Res., 71, 2179, 1966.
Macmillan, S. and Maus, S.: International Geomagnetic Reference
Field – the tenth generation, Earth Planets Space, 57, 1135–1140,
2005.
Mikhailov, A. V. and Marin, D.: Geomagnetic control of the f0F2
long-term trends, Ann. Geophys. 18, 653–665, 2000.
Mursula, K. and 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,
Phys. Chem. Earth, 24, 389–392, 1999.
Perrone, L., De Franceschi, G., and Gulyaeva, T.: The timeweighted
magnetic indices ap( ), PC( ) and AE( ) and their
correlation to the southern high latitude ionosphere, Phys. Chem.
Earth, 26/5, 331–334, 2001.
Piggott, W. R. and 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., and Patil, A. G.: Rapid decrease
in total magnetic field F at Antarctic stations-its relationship to
core-mantle features, Antarct. Sci., 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. Geophys. Res., 107(A10), 1304,
doi:10.1029/2001JA000507, 2002.
Rishbeth, H.: The quadrupole ionosphere, Ann. Geophys., 3, 293–
298, 1985,
http://www.ann-geophys.net/3/293/1985/.
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., and Le Sager, P.: IHV : A new longterm
geomagnetic index, Adv. Space Res., 34, 436–439, 2004.
Ulich, T., Clilverd, M. A., and 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( ) and Kp( ), J.
Geophys. Res., 92, 125–129, 1987.
Wu, J. and Wilkinson, P. J.: Time-weighted indices as predictors
of ionospheric behaviour, J. Atmos. Terr. Phy., 57, 1736–1770,
1995.
Type
article
File(s)
No Thumbnail Available
Name
angeo-26-1173-2008.pdf
Size
354.82 KB
Format
Adobe PDF
Checksum (MD5)
7f93be5ac894d5c1e4d9f839c28dc703