Long Term Trends of the critical frequency of the F2 layer at Northern and Southern high latitude regions

Abstract The long-term behaviour of the plasma frequency of the F2 layer, foF2, is investigated to contribute to the discussion about the natural or anthropogenic origin of the ionospheric long-term changes. In this paper, long time series of hourly foF2 data from two high latitude ionospheric obser...

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Main Authors: Alfonsi, Lu., De Franceschi, G., Perrone, L., Materassi, M.
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, Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Materassi, M.; CNR-ISC, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, CNR-ISC
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2002
Subjects:
long term trends
01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics
01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation
Antarctic
Antarc*
Online Access:http://hdl.handle.net/2122/3498
id ftingv:oai:www.earth-prints.org:2122/3498
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
01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics
01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation
spellingShingle long term trends
01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics
01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation
Alfonsi, Lu.
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
topic_facet long term trends
01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics
01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation
description Abstract The long-term behaviour of the plasma frequency of the F2 layer, foF2, is investigated to contribute to the discussion about the natural or anthropogenic origin of the ionospheric long-term changes. In this paper, long time series of hourly foF2 data from two high latitude ionospheric observatories of both the hemispheres are analysed. A decreasing trend of foF2 is found confirming a previous result obtained by using the foF2 monthly medians from Antarctic stations. This negative trend does not show a clear dependence on the long-term behaviour of the geomagnetic activity impact on the ionosphere. Published 607-612 3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale JCR Journal reserved
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
Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia
Materassi, M.; CNR-ISC
Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia
CNR-ISC
format Article in Journal/Newspaper
author Alfonsi, Lu.
De Franceschi, G.
Perrone, L.
Materassi, M.
author_facet Alfonsi, Lu.
De Franceschi, G.
Perrone, L.
Materassi, M.
author_sort Alfonsi, Lu.
title Long Term Trends of the critical frequency of the F2 layer at Northern and Southern high latitude regions
title_short Long Term Trends of the critical frequency of the F2 layer at Northern and Southern high latitude regions
title_full Long Term Trends of the critical frequency of the F2 layer at Northern and Southern high latitude regions
title_fullStr Long Term Trends of the critical frequency of the F2 layer at Northern and Southern high latitude regions
title_full_unstemmed Long Term Trends of the critical frequency of the F2 layer at Northern and Southern high latitude regions
title_sort long term trends of the critical frequency of the f2 layer at northern and southern high latitude regions
publisher Elsevier
publishDate 2002
url http://hdl.handle.net/2122/3498
geographic Antarctic
geographic_facet Antarctic
genre Antarc*
Antarctic
genre_facet Antarc*
Antarctic
op_relation Physics and Chemistry of the Earth
6-8/27 (2002)
Alfonsi, L., De Franceschi, G., Perrone, L., 2001. Long term trend in 259 the high latitude Ionosphere. Phys. Chem. Earth 26/5, 303–307. 260 Balthazor, R.L., Moffett, R.J., 1999. Morphology of large-scale 261 travelling atmospheric disturbances in the polar thermosphere. J. 262 Geophys. Res. 104, A1. Bremer, J., 1992. Ionospheric trends in mid-latitudes as a possible 263 indicator of the atmospheric greenhouse effect. J. Atmos. Terr. 264 Phys. 54, 1505–1511. 265 Clilverd, M.A., Clark, T.D.G., Clarke, E., Rishbeth, H., 1998. 266 Increased magnetic storm activity from 1868 to 1995. J. Atmos. 267 Solar-Terr. Phys. 60, 1047–1056. 268 Danilov, A.D., 2001. F2 region response to geomagnetic disturbance. 269 J. Atmos. Solar-Terr. Phys. 63, 441–449. 270 De Franceschi, G., Wilkinson, P., 2001. Report on the studies about 271 the long-term ionospheric behaviour in Antarctica. On INAG 272 (Ionosonde Network Advisory Group) Report (in press). 273 De Franceschi, G., Gulyaeva, T.L., Perrone, L., Zolesi, B., 1999. 274 MAC: an oriented magnetic activity catalogue for ionospheric 275 applications. U.R.S.I. Int. Ref. Ionosphere News Lett. 6/4, 5–6. 276 De Franceschi, G., Gulyaeva, T.L., Perrone, L., Zolesi, B., 2001. A 277 statistical analysis of ionospheric irregularities at mid and high 278 latitudes. A special issue article on Inverse Problems (in press). 279 D. Bilitza (Ed.), 1990. IRI, International Reference Ionosphere. 280 NSSDC 90-22, Greenbelt, MA, USA. 281 ITU-R, HF propagation prediction method, 1995. Recommendation 282 ITU-R. International Telecommunication Union, Geneva, p. 313. 283 Jarvis, M., 1996. Quasi-biennial oscillation effects in the semidiurnal 284 tide of the Antarctic lower thermosphere. Geophys. Res. Lett. 23, 285 2661–2664. 286 Jarvis, M.J., Jenkins, B., Rodgers, G.A., 1998. Southern hemisphere 287 observations of long term decrease in F region altitude and 288 thermospheric wind providing possible evidence for global ther- 289 mospheric cooling. J. Geophys. Res. 103, 29774–29787. 290 Liu, R.Y., Smith, P.A., King, J.W., 1983. A new solar index which 291 leads to improved foF2 predictions using the CCIR. Atlas 292 Telecommun. J. 50, 408–414. 293 Makarova, L.N., Shirochkov, A.V., 1998. The magnetopause position 294 as an indicator of the ionisation level in the dayside high latitude 295 ionosphere. Radio Sci. 33, 1877–1884. 296 Mayaud, P.N., 1980. Derivation, meaning and use of geomagnetic 297 indices. In: Geophysical Monograph. AGU, Washington, DC. 298 Mc Namara, L.F., 1991. The Ionosphere: Communications, Surveil- 299 lance, and Direction Finding. Krieger Publishing Company, 300 Malabar, FL. 301 Mikhailov, A.V., Marin, D., 2000. Geomagnetic control of the foF2 302 long term trends. Ann. Geophys. 18, 653–665. 303 Papitashvili, V., 2001. Solar cycle effects in near-Earth interplanetary 304 parameters and geomagnetic activity. Proceedings of the Eurocon- 305 ference SOLSPA (Italy), on ESA-SP 477 (in press). 306 Perrone, L., De Franceschi, G., 1999. A correlation study between 307 time-weighted magnetic indices and the high latitude ionosphere. 308 Phys. Chem. Earth 24/4, 389–392. 309 Perrone, L., De Franceschi, G., Gulyaeva, T.L., 2001. The time- 310 weighted magnetic indices ap(s), PC(s) and AE(s) and their 311 correlation to the southern high latitude Ionosphere. Phys. Chem. 312 Earth 26/5, 331–334. 313 Piggott, W.R., Rawer, K., 1972. U.R.S.I. Handbook of Ionogram 314 Interpretation and Reduction, World Data Center A for Solar- 315 Terrestrial Physics. NOAA, Boulder, CO. 316 Rishbeth, H., 1990. A greenhouse effect in the ionosphere. Planet. 317 Space Sci. 38, 945–948. 318 Rishbeth, H., Roble, R.G., 1992. Cooling of the upper atmosphere by 319 enhanced greenhouse gases- Modelling of the thermospheric and 320 ionospheric effects. Planet. Space Sci. 40, 1011–1026. 321 Staehelin, J., Harris, N.R.P., Appenzeller, C., Eberhard, J., 2001. 322 Ozone trends: a review. Rev. Geophy. 39/2, 231–290. 323 Ulich, Th., Turunen, E., 1997. Evidence for long term cooling of the 324 upper atmosphere. Geophys. Res Lett. 24, 1103–1106. 325 Wrenn, G.L., 1987. Time-weighted accumulations ap(s) and Kp(s). J. 326 Geophys. Res. 92, 125–129. 327 Wu, J., Wilkinson, P.J., 1995. Time-weighted indices as predictors of 328 ionospheric behaviour. J. Atmos. Terr. Phys. 57, 1736–1770. 329
http://hdl.handle.net/2122/3498
op_rights restricted
_version_ 1766255654407766016
spelling ftingv:oai:www.earth-prints.org:2122/3498 2023-05-15T13:51:39+02:00 Long Term Trends of the critical frequency of the F2 layer at Northern and Southern high latitude regions Alfonsi, Lu. De Franceschi, G. Perrone, L. Materassi, M. 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 Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Materassi, M.; CNR-ISC Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia CNR-ISC 2002 http://hdl.handle.net/2122/3498 en eng Elsevier Physics and Chemistry of the Earth 6-8/27 (2002) Alfonsi, L., De Franceschi, G., Perrone, L., 2001. Long term trend in 259 the high latitude Ionosphere. Phys. Chem. Earth 26/5, 303–307. 260 Balthazor, R.L., Moffett, R.J., 1999. Morphology of large-scale 261 travelling atmospheric disturbances in the polar thermosphere. J. 262 Geophys. Res. 104, A1. Bremer, J., 1992. Ionospheric trends in mid-latitudes as a possible 263 indicator of the atmospheric greenhouse effect. J. Atmos. Terr. 264 Phys. 54, 1505–1511. 265 Clilverd, M.A., Clark, T.D.G., Clarke, E., Rishbeth, H., 1998. 266 Increased magnetic storm activity from 1868 to 1995. J. Atmos. 267 Solar-Terr. Phys. 60, 1047–1056. 268 Danilov, A.D., 2001. F2 region response to geomagnetic disturbance. 269 J. Atmos. Solar-Terr. Phys. 63, 441–449. 270 De Franceschi, G., Wilkinson, P., 2001. Report on the studies about 271 the long-term ionospheric behaviour in Antarctica. On INAG 272 (Ionosonde Network Advisory Group) Report (in press). 273 De Franceschi, G., Gulyaeva, T.L., Perrone, L., Zolesi, B., 1999. 274 MAC: an oriented magnetic activity catalogue for ionospheric 275 applications. U.R.S.I. Int. Ref. Ionosphere News Lett. 6/4, 5–6. 276 De Franceschi, G., Gulyaeva, T.L., Perrone, L., Zolesi, B., 2001. A 277 statistical analysis of ionospheric irregularities at mid and high 278 latitudes. A special issue article on Inverse Problems (in press). 279 D. Bilitza (Ed.), 1990. IRI, International Reference Ionosphere. 280 NSSDC 90-22, Greenbelt, MA, USA. 281 ITU-R, HF propagation prediction method, 1995. Recommendation 282 ITU-R. International Telecommunication Union, Geneva, p. 313. 283 Jarvis, M., 1996. Quasi-biennial oscillation effects in the semidiurnal 284 tide of the Antarctic lower thermosphere. Geophys. Res. Lett. 23, 285 2661–2664. 286 Jarvis, M.J., Jenkins, B., Rodgers, G.A., 1998. Southern hemisphere 287 observations of long term decrease in F region altitude and 288 thermospheric wind providing possible evidence for global ther- 289 mospheric cooling. J. Geophys. Res. 103, 29774–29787. 290 Liu, R.Y., Smith, P.A., King, J.W., 1983. A new solar index which 291 leads to improved foF2 predictions using the CCIR. Atlas 292 Telecommun. J. 50, 408–414. 293 Makarova, L.N., Shirochkov, A.V., 1998. The magnetopause position 294 as an indicator of the ionisation level in the dayside high latitude 295 ionosphere. Radio Sci. 33, 1877–1884. 296 Mayaud, P.N., 1980. Derivation, meaning and use of geomagnetic 297 indices. In: Geophysical Monograph. AGU, Washington, DC. 298 Mc Namara, L.F., 1991. The Ionosphere: Communications, Surveil- 299 lance, and Direction Finding. Krieger Publishing Company, 300 Malabar, FL. 301 Mikhailov, A.V., Marin, D., 2000. Geomagnetic control of the foF2 302 long term trends. Ann. Geophys. 18, 653–665. 303 Papitashvili, V., 2001. Solar cycle effects in near-Earth interplanetary 304 parameters and geomagnetic activity. Proceedings of the Eurocon- 305 ference SOLSPA (Italy), on ESA-SP 477 (in press). 306 Perrone, L., De Franceschi, G., 1999. A correlation study between 307 time-weighted magnetic indices and the high latitude ionosphere. 308 Phys. Chem. Earth 24/4, 389–392. 309 Perrone, L., De Franceschi, G., Gulyaeva, T.L., 2001. The time- 310 weighted magnetic indices ap(s), PC(s) and AE(s) and their 311 correlation to the southern high latitude Ionosphere. Phys. Chem. 312 Earth 26/5, 331–334. 313 Piggott, W.R., Rawer, K., 1972. U.R.S.I. Handbook of Ionogram 314 Interpretation and Reduction, World Data Center A for Solar- 315 Terrestrial Physics. NOAA, Boulder, CO. 316 Rishbeth, H., 1990. A greenhouse effect in the ionosphere. Planet. 317 Space Sci. 38, 945–948. 318 Rishbeth, H., Roble, R.G., 1992. Cooling of the upper atmosphere by 319 enhanced greenhouse gases- Modelling of the thermospheric and 320 ionospheric effects. Planet. Space Sci. 40, 1011–1026. 321 Staehelin, J., Harris, N.R.P., Appenzeller, C., Eberhard, J., 2001. 322 Ozone trends: a review. Rev. Geophy. 39/2, 231–290. 323 Ulich, Th., Turunen, E., 1997. Evidence for long term cooling of the 324 upper atmosphere. Geophys. Res Lett. 24, 1103–1106. 325 Wrenn, G.L., 1987. Time-weighted accumulations ap(s) and Kp(s). J. 326 Geophys. Res. 92, 125–129. 327 Wu, J., Wilkinson, P.J., 1995. Time-weighted indices as predictors of 328 ionospheric behaviour. J. Atmos. Terr. Phys. 57, 1736–1770. 329 http://hdl.handle.net/2122/3498 restricted long term trends 01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics 01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation article 2002 ftingv 2022-07-29T06:04:48Z Abstract The long-term behaviour of the plasma frequency of the F2 layer, foF2, is investigated to contribute to the discussion about the natural or anthropogenic origin of the ionospheric long-term changes. In this paper, long time series of hourly foF2 data from two high latitude ionospheric observatories of both the hemispheres are analysed. A decreasing trend of foF2 is found confirming a previous result obtained by using the foF2 monthly medians from Antarctic stations. This negative trend does not show a clear dependence on the long-term behaviour of the geomagnetic activity impact on the ionosphere. Published 607-612 3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale JCR Journal reserved Article in Journal/Newspaper Antarc* Antarctic Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Antarctic

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