Rishbeth H. How the thermospheric circulation affects the ionospheric F2-layer[J]. J. Atmos. Sol. Terr. Phys., 1998, 60(14):1385-1402
[2]
Rishbeth H, Müller-Wodarg I C F, Zou L, et al. Annual and semiannual variations in the ionospheric F2-layer: II. Physical discussion[J]. Ann. Geophys., 2000, bf 18(8):945-956
[3]
Immel T J, Sagawa E, England S L, et al. Control of equatorial ionospheric morphology by atmospheric tides[J]. it Geophys. Res. Lett., 2006, 33(15):198-210
[4]
Hagan M E, Maute A, Roble R G, et al. Connections between deep tropical clouds and the Earth''s ionosphere[J]. it Geophys. Res. Lett., 2007, 34(20):120-122
[5]
Horvath I, Essex E A. Vertical E drift velocity variations and associated low-latitude ionospheric irregularities investigated with the TOPEX and GPS satellite data[J]. Ann. Geophys., 2003, 21:1017-1030
[6]
Thampi S V, Lin C, Liu H, et al. First tomographic observations of the midlatitude summer nighttime anomaly over Japan[J]. J. Geophys. Res., 2009, 114(A10):270-313
[7]
Lin C H, Liu J Y, Cheng C Z, et al. Three-dimensional ionospheric electron density structure of the Weddell Sea anomaly[J]. J. Geophys. Res., 2009, 114(A2)
[8]
Burns A G, Zeng Z, Wang W, et al. Behavior of the F2 peak ionosphere over the South Pacific at dusk during quiet summer conditions from COSMIC data[J]. J. Geophys. Res., 2008, 113(A12):2036-2044
[9]
Zhang S R, Foster J C, Coster A J, et al. East-West Coast differences in total electron content over the continental US[J]. Geophys. Res. Lett., 2011, 38(19):103-140
[10]
Zhao B, Wang M, Wang Y, et al. East-west differences in F-region electron density at midlatitude: Evidence from the Far East region[J]. J. Geophys. Res., 2013, bf118(1):542-553
[11]
Xu J S, Li X J, Liu Y W, et al. TEC differences for the mid-latitude ionosphere in both sides of the longitudes with zero declination[J]. it Adv. Space Res., 2014, 54(5):883-895
[12]
Zhang S R, Chen Z, CosterA J, it et al. Ionospheric symmetry caused by geomagnetic declination over North America[J]. Geophys. Res. Lett., 2013, 40(20):5350-5354
[13]
Storch H, Zwiers F W. Statistical Analysis in Climate Research[M]. Cambridge: Cambridge University Press, 2001
[14]
Daniell R E, Brown L D, Anderson D N, et al. Parameterized ionospheric model: A global ionospheric parameterization based on first principle models[J]. Radio Sci., 1995, 30(5):1499-1510
[15]
Howe B M, Runciman K, Secan J A. Tomography of the ionosphere: Four-dimensional simulations[J]. Radio Sci., 1998, 33(1):109-128
[16]
Mao T, Wan W X, Liu L B. An EOF based empirical model of TEC over Wuhan[J]. Chin. J. Geophys., 2005, bf48(4):827-834
[17]
Mao T, Wan W, Yue X, et al. An empirical orthogonal function model of total electron content over China[J]. Radio Sci., 2008, 43(2):2217-2235
[18]
Liu C, Zhang M L, Wan W, et al. Modeling M(3000)F2 based on empirical orthogonal function analysis method[J]. Radio Sci., 2008, 43(1):411-411.
[19]
Wan W X, Ding F, Ren Z P, et al. Modeling the global ionospheric total electron content with empirical orthogonal function analysis[J]. Sci. China: Tech. Sci., 2012, bf55(5):1161-1168
[20]
Hern''andez-Pajares M. Performance of IGS ionosphere TEC maps[R]. Barcelona: Research Group of Astronomy and Geomatics, Technical University of Catalonia, 2003:16
[21]
Mannucci A J, Wilson B D, Yuan D N, et al. A global mapping technique for GPS: Derived ionospheric total electron content measurements[J]. Radio Sci., 1998, bf33(3):565-582
[22]
Iijima B A, Harris I L, Ho C M, it et al. Automated daily process for global ionospheric total electron content maps and satellite ocean altimeter ionospheric calibration based on Global Positioning System data[J]. J. Atmos. Sol. Terr. Phys., 1999, 61(16):1205-1218
[23]
Navarra A, Simoncini V. A Guide to Empirical Orthogonal Functions for Climate Data Analysis[M]. Springer Netherlands, 2010
[24]
Tabachnick B G, Fidell L S. Using Multivariate Statis-tics[M]. Boston Massachusetts Allyn and Bacon, 2001
[25]
Liu L, Wan W, Ning B, et al. Solar activity variations of the ionospheric peak electron density[J]. J. Geophys. Res., 2006, 111(A8):437-440
[26]
Richards P G, Fennelly J A, Torr D G. EUVAC: A solar EUV flux model for aeronomic calculations[J]. J. Geophys. Res., 1994, 99(A5):8981-8992
[27]
Forbes J M, Palo S E, Zhang X. Variability of the ionosphere[J]. J. Atmos. Sol. Terr. Phys., 2000, 62(8):685-693
[28]
Rishbeth H, Mendillo M. Patterns of F2-layer variability[J]. J. Atmos. Sol. Terr. Phys., 2001, 63(15):1661-1680
[29]
Millward G H, Rishbeth H, Fuller-Rowell T J, et al. Ionospheric F2 layer seasonal and semiannual variations[J]. J. Geophys. Res., 1996, 101(A3):5149-5156
[30]
Zhao B, Wan W, Liu L, et al. Features of annual and semiannual variations derived from the global ionospheric maps of total electron content[J]. Ann. Geophys., 2008, bf25(12):2513-2527
[31]
Zou L, Rishbeth H, Müller-Wodarg I C F, et al. Annual and semiannual variations in the ionospheric F2-layer. I. Modelling[J]. Ann. Geophys., 2000, bf18(8):927-944
[32]
Yu T, Wan W, Liu L, et al. A simulation study on the semiannual variation of the ionospheric F2 layer zonal electric fields at the magnetic equator[J]. J. Geophys. Res., 2006, 111, doi:10.1029/2005JA011390
[33]
Ma R, Xu J, Liao H. The features and a possible mecha-nism of semiannual variation in the peak electron density of the low latitude F2 layer[J]. J. Atmos. Sol. Terr. Phys., 2003, 65(1):47-57
[34]
Lin C H, Liu C H, Liu J Y, et al. Midlatitude summer nighttime anomaly of the ionospheric electron density observed by FORMOSAT-3/COSMIC[J]. J. Geophys. Res., 2010, 115, doi:10.1029/2009JA014084
[35]
Penndorf R. The average ionospheric conditions over the Antarctic[M]//Geomagnetism and Astronomy: Studies in the Ionosphere, Geomagnetism and Atmospheric Radio Noise, Antarct. Res. Ser., Washington DC: AGU, 1965:1-45
[36]
He M, Liu L, Wan W, et al. A study of the Weddell Sea Anomaly observed by FORMOSAT-3/COSMIC[J]. J. Geophys. Res., 2009, 114(A12)
[37]
Burns A G, Solomon S C, Wang W, it et al. The summer evening anomaly and conjugate effects[J]. J. Geophys. Res., 2011, 116(A1)
[38]
Burger W, Burge M J. Digital image processing: An algorithmic introduction using Java[M]. Springer Science & Business Media, 2009
[39]
Hoggar S G. Mathematics of Digital Images: Creation, Compression, Restoration, Recognition[M]. Cambridge: Cambridge University Press, 2006