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Day-to-Day Variability of H Component of Geomagnetic Field in Central African Sector Provided by Yaoundé-Cameroon Amber Station

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The geomagnetic data obtained from Amber Network station in Cameroon have been used for this study. The variability of H component of geomagnetic field has been examined by using geomagnetic field data of X and Y components recorded at AMBER magnetometer station hosted by the Department of Physics of University of Yaoundé (3.87°N, 11.52°E). The day-to-day variability of the horizontal intensity of the geomagnetic field was examined and shows that the scattering of H component of magnetic field variation is more on disturbed than that on quiet condition. The signatures H of geomagnetic Sq and Sd variations in intensities in the geomagnetic element, has been studied. This study shows that the daytime variations in intensities of geomagnetic elements H, Sq(H) and Sd(H) respectively are generally greater than night-time ones. This paper interests answering the two questions: 1) how can geomagnetic variations be used to study the equatorial ionosphere electrodynamics and electrojet equatorial over Africa in general and Cameroon in particular? 2) How can geomagnetic variations be used to monitor and predict space weather events in Cameroon? This paper presents and interprets the results of H component of geomagnetic field variations during magnetic storms and on quiet days.
Cite this paper
Honore, M. , Comelo, K. and Cesar, M. (2014) Day-to-Day Variability of H Component of Geomagnetic Field in Central African Sector Provided by Yaoundé-Cameroon Amber Station. International Journal of Geosciences, 5, 1190-1205. doi: 10.4236/ijg.2014.510099. 
 

[1] Yizengaw, E. and Moldwin, M.B. (2009) African Meridian B-Field Education and Research (AMBER) Array. Earth Moon Planet, 104, 237-246.
http://dx.doi.org/10.1007/s11038-008-9287-2
[2] Yizengaw, E., Moldwin, M.B., Mebrahtu, A., Damtie, B., Zesta, E., Valladares, C.E. and Doherty, P.H. (2011) Comparison of Storm Time Equatorial Ionospheric Electrodynamics in the African and American Sectors. Journal of Atmospheric and Terrestrial Physics, 73, 156-163.
http://dx.doi.org/10.1016/j.jastp.2010.08.008
[3] Yizengaw, E., Moldwin, M.B., Sahai, Y. and De Jesus, R. (2009) Strong Post-Midnight Equatorial Ionospheric Anomaly Observations during Magnetically Quiet Periods. Journal of Geophysical Research, 114, Article ID: A12308.
http://dx.doi.org/10.1029/2009JA014603
[4] Yizengaw, E., Retterer, J., Pacheco, E.E., Roddy, P., Groves, K., Caton, R. and Baki, P. (2013) Post-Midnight Bubbles and Scintillations in the Quiet-Time June Solstice. Geophysical Research Letters, 40, 5592-5597.
http://dx.doi.org/10.1002/2013GL058307
[5] Rastogi, R.G. and Klobuchar, J.A. (1990) Ionospheric Electron Content within the Equatorial F2 Layer Anomaly Belt. Journal of Geophysical Research, 95, 19045-19052. http://dx.doi.org/10.1029/JA095iA11p19045
[6] Fejer, B.G., De Paula, E.R., Batista, I.S., Bonelli, E. and Woodman, R.F. (1989) Equatorial F Region Vertical Plasma Drifts during Solar Maxima. Journal of Geophysical Research, 94, 12049-12054.
http://dx.doi.org/10.1029/JA094iA09p12049
[7] Campbell, W.H. (1997) Introduction to Geomagnetic Fields. Cambridge University Press, Cambridge.
[8] Fukushima, N. and Kamide, Y. (1973) Partial Current Models for Worldwide Geomagnetic Disturbances. Reviews of Geophysics and Space Physics, 11, 795-853.
http://dx.doi.org/10.1029/RG011i004p00795
[9] Onwumechili, C.A., Matsushita, S. and Campbell, W.H. (1967) Physics of Geomagnetic Phenomena. Academic Press, New York, 425-507.
http://dx.doi.org/10.1016/B978-0-12-480301-5.50014-8
[10] Obiekezie, T.N. and Agbo, G.A. (2008) Day to Day Variability of Sq(H) Variation in the Indian Sector. JANS, 3, 81-85.
[11] Rabiu, A.B., Mamukuyomi, A.I. and Joshua, E.O. (2007) Variability of Equatorial Ionosphere Inferred from Geomagnetic Field Measurements. Bulletin of the Astronomical Society of India, 35, 607-618.
[12] Agbo, G.A., Chikwendu, A.O. and Obiekezie, T.N. (2010) Variability of Daily Horizontal Component of Geomagnetic Field Component at Low and Middle Latitudes. Indian Journal of Scientific Research, 1, 1-8.
[13] Obiekezie, T.N. and Okeke, F.N. (2009) Variations of Geomagnetic H, D and Z Field Intensities on Quiet Days at West African Latitudes. Moldavian Journal of the Physical Sciences, 8, 366-372.
[14] Obiekezie, T.N. and Obiadazie, S.C. (2013) The Variability of H Component of Geomagnetic Field at the African Sector. Physical Review & Research International, 3, 154-160.
[15] Forbes, J.M. (1981) The Equatorial Electrojet. Reviews of Geophysics, 19, 469-504.
http://dx.doi.org/10.1029/RG019i003p00469
[16] Heelis, R.A. (2004) Electrodynamics in the Low and Middle Latitude Ionosphere: A Tutorial. Journal of Atmospheric and Solar-Terrestrial Physics, 66, 825-838.
http://dx.doi.org/10.1016/j.jastp.2004.01.034
[17] Onwumechili, C.A. (1997) The Equatorial Electrojet. Gordon and Breach Science Publishers, the Netherlands, 610 p.
[18] Vestine, E. (1947) The Geomagnetic Field, Its Description and Analysis. Carnegie Institute, Washington Publishing, 580 p.
[19] Onwumechili, C.A. and Ezema, P.O. (1977) On the Course of the Geomagnetic Daily Variation in Low Latitudes. Journal of Atmospheric and Terrestrial Physics, 39, 1079-1086.
http://dx.doi.org/10.1016/0021-9169(77)90016-2
[20] Motoba, T., Kikuchi, T., Shibata, T.F. and Yumoto, K. (2004) HF Doppler Oscillations in the Low-Latitude Ionosphere Coherent with Equatorial Long-Period Geomagnetic Field Oscillation. Journal of Geophysical Research: Space Physics, 109, Published Online.                      eww141007lx
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