Studies of ionospheric variations during geomagnetic activities at the low-latitude station, Ile-Ife, Nigeria

Czasopismo : Acta Geophysica
Tytuł artykułu : Studies of ionospheric variations during geomagnetic activities at the low-latitude station, Ile-Ife, Nigeria

Autorzy :
Eshagh, M.
Division of Geodesy and Geoinformatics, Royal Institute of Technology (KTH), Stockholm, Sweden; Department of Geodesy, K.N.Toosi University of Technology, Tehran, Iran, eshagh@kth.se,
Teisseyre, R.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, rt@igf.edu.pl,
Lizurek, G.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, lizurek@igf.edu.pl,
Asfahani, J.
Atomic Energy Commission, Damascus, Syria, cscientific@aec.org.sy,
Baddari, K.
Laboratory of Physics of the Earth UMBB, Boumerdes, Algeria, doyenfs@umbb.dz,
Bose, S. K.
Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur, West Bengal, India, sujitbose@yahoo.com,
Romanowicz, R. J.
Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland, romanowicz@igf.edu.pl,
Pagliara, S.
Department of Civil Engineering, University of Pisa, Pisa, Italy, s.pagliara@ing.unipi.it,
Huang, S.
Potsdam Institute for Climate Impact Research, Potsdam, Germany, huang@pik-potsdam.de,
Kubrak, E.
Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences, Warszawa, Poland, Elzbieta_Kubrak@sggw.pl,
Falayi, E. O.
Department of Physics, Tai Solarin University of Education, Ijebu-Ode, Nigeria, olukayodefalayi@yahoo.com,
Ariyibi, E. A.
Department of Physics, Obafemi Awolowo University, Ile-Ife, Nigeria, eariybi@oauife.edu.ng,
Abstrakty : The dual frequency SCINDA N ovAtel GSV 4004B GPS receiver installed at the Ile-Ife (low-latitude station) has been in operation since December 2009. Data records for the year 2010 were processed to obtain Total Electron Content (TEC) and S4 index. These were interpreted to analyze the ionospheric condition during low geomagnetic activity period (when Dst is from –40 to 0 nT) and during geomagnetic storm events (with Dst about –100 nT). Seasonal variations of the TEC and S4 index were also investigated. The occurrence of scintillations is closely linked to the peak value of TEC during the daytime; this is very evident during the equinox months when TEC ≥ 30 TECu. When the maximumTEC value is below 30 TECu, as shown by most of the days in the summer months, the scintillation phenomenon does not occur. During geomagnetic storms, the daytime segment of the TEC plot experiences fluctuations (even bifurcations) in values with the peak TEC value of about 40 TECu. From the interpreted data, the occurrence of geomagnetic storm does not necessarily suggest an increase in the level of scintillations at a low-latitude region. Also, there is a remarkable difference between the IRI 2007 model and the observed TEC values, as the daytime TEC peak differs in magnitude and time of occurrence from the ob served TEC.

Słowa kluczowe : scintillation, geomagnetic storms, ionosphere, vertical drift,
Wydawnictwo : Instytut Geofizyki PAN
Rocznik : 2013
Numer : Vol. 61, no. 1
Strony : 223 – 239
Bibliografia : Ariyibi, E.A., P. Doherty, A.J. Coster, and E.O. Joshua (2012), Diurnal variation of ionospheric TEC and S4 index, during the period of low geomagnetic activity at Ile-Ife, Nigeria, Arab. J. Sci. Eng. (in press).
Aarons, J., M. Mendillo, and R. Yantosca (1997), GPS phase fluctuations in the equatorial region during sunspot minimum, Radio Sci. 32, 4, 1535-1550, DOI: 10.1029/97RS00664.
Abdu, M.A., I.S. Batista, G.O. Walker, J.H.A. Sobral, N.B. Trivedi, and E.R. de Paula (1995), Equatorial ionospheric electric fields during magnetospheric disturbances: local time/longitude dependences from recent EITS campaigns, J. Atmos. Terr. Phys. 57, 10, 1065-1083, DOI: 10.1016/0021-9169(94)00123-6.
Bagiya, M.S., H.P. Joshi, K.N. Iyer, M. Aggarwal, S. Ravindran, and B.M. Pathan (2009), TEC variations during low solar activity period (2005-2007) near the Equatorial Ionospheric Anomaly Crest region in India, Ann. Geophys. 27, 3, 1047-1057, DOI: 10.5194/angeo-27-1047-2009.
Basu, S., S. Basu, C.E. Valladares, H.-C. Yeh, S.-Y. Su, E. MacKenzie, P.J. Sultan, J. Aarons, F.J. Rich, P. Doherty, K.M. Groves, and T.W. Bullet (2001), Ionospheric effects of major magnetic storms during the International Space Weather Period of September and October 1999: GPS observations, VHF/UHF scintillations, and in situ density structures at middle and equatorial latitudes, J. Geophys. Res. 106, A12, 30389-30413, DOI: 10.1029/2001JA001116.
Buonsanto, M.J. (1999), Ionospheric storms – A review, Space Sci. Rev. 88, 3-4, 563-601, DOI: 10.1023/A:1005107532631.
Carrano, C., and K. Groves (2009), Remote sensing the ionosphere using GPSSCINDA. In: Proc. IHY-Africa/SCINDA 2009 Workshop, 7-12 June 2009, Zambia.
Danilov, A.D., and J. Lastovicka (2001), Effects of geomagnetic storms on the ionosphere and atmosphere, Int. J. Geomagn. Aeron. 2, 209-224.
Dashora, N., and R. Pandey (2005), Observations in equatorial anomaly region of total electron content enhancements and depletions, Ann. Geophys. 23, 7, 2449-2456, DOI: 10.5194/angeo-23-2449-2005.
Dashora, N., and R. Pandey (2007), GPS data post-processing methods for undifferenced receivers located near the crest of EIA. In: Proc. Int. Beacon Satellite Symp., Boston, USA.
Dashora, N., S. Sharma, R.S. Dabas, S. Alex, and R. Pandey (2009), Large enhancements in low latitude total electron content during 15 May 2005 geomagnetic storm in Indian zone, Ann. Geophys. 27, 5, 1803-1820, DOI: 10.5194/angeo-27-1803-2009.
Fedrizzi, M., E.R. de Paula, R.B. Langley, A. Komjathy, I.S. Batista, and I.J. Kantor (2005), Study of March 31, 2001 magnetic storm effects on the ionosphere using GPS data, Adv. Space Res. 36, 3, 534-545, DOI: 10.1016/j.asr.2005.07.019.
Fuller-Rowell, T.J., M.V. Codrescu, H. Rishbeth, R.J. Moffett, and S. Quegan (1996), On the seasonal response of the thermosphere and ionosphere to geomagnetic storms, J. Geophys. Res. 101, A2, 2343-2353, DOI: 10.1029/95JA01614.
Jakowski, N., S. Schlüter, and E. Sardon (1999), Total electron content of the ionosphere during the geomagnetic storm on 10 January 1997, J. Atmos. Solar-Terr. Phys. 61, 3-4, 299-307, DOI: 10.1016/S1364-6826(98)00130-8.
Klobuchar, J.A. (1986), Design and characteristics of the GPS ionospheric time delay algorithm for single frequency users. In: PLANS ‘86 – Position Location and Navigation Symp., 4-7 November 1986, Las Vegas, USA, New York Institute of Electrical and Electronics Engineers (A87-41351 18-17), 280-286.
Langley, R.B. (2000), GPS, the ionosphere, and the solar maximum, GPS World, July, 44-49.
Liu, L., W. Wan, and B. Ning (2006), A study of the ionogram derived effective scale height around the ionospheric hmF2, Ann. Geophys. 24, 3, 851-860, DOI: 10.5194/angeo-24-851-2006.
Maruyama, T., G. Ma, and M. Nakamura (2004), Signature of TEC storm on 6 November 2001 derived from dense GPS receiver network and ionosonde chain over Japan, J. Geophys. Res. 109, A10302, DOI: 10.1029/2004JA010451.
Ogunade, S.O. (1987), Geomagnetic variations in south-western Nigeria: Preliminary results, Ann. Geophys. B 5, 6, 607-611.
Pirog, O.M., N.M. Polekh, G.A. Zherebtsov, V.F. Smirnov, J.K. Shi, and X. Wang (2006), Seasonal variations of the ionospheric effects of geomagnetic storms at different latitudes of East Asia, Adv. Space Res. 37, 5, 1075-1080, DOI: 10.1016/j.asr.2006.02.007.
Valladares, C.E., J. Villalobos, R. Sheehan, and M.P. Hagan (2004), Latitudinal extension of low-latitude scintillations measured with a network of GPS receivers, Ann. Geophys. 22, 9, 3155-3175, DOI: 10.5194/angeo-22-3155-2004.
Zhao, B., W. Wan, and L. Liu (2005), Response of equatorial anomaly to the October-November 2003 superstorms, Ann. Geophys. 23, 3, 693-706, DOI: 10.5194/angeo-23-693-2005.
DOI :
Cytuj : Eshagh, M. ,Teisseyre, R. ,Lizurek, G. ,Asfahani, J. ,Baddari, K. ,Bose, S. K. ,Romanowicz, R. J. ,Pagliara, S. ,Huang, S. ,Kubrak, E. ,Falayi, E. O. ,Ariyibi, E. A. , Studies of ionospheric variations during geomagnetic activities at the low-latitude station, Ile-Ife, Nigeria. Acta Geophysica Vol. 61, no. 1/2013
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