Variations of ionospheric TEC at geomagnetic conjugate points during solar minimum

Abstract

We have studied the variations of TEC at quasiconjugate points using data obtained from GPS receiver at Sew station Antarctica (SYOG) (GC 49.99 5, 39.38 E COM MMS, 7L65 E's and Arbolt station (ARIO), Iceland 15 period in 2007, during the minimum phase of Big Artic region) (GC 66.19 N. 34289 E: CGM: 6437S ryck 23. The GPS measurements of IGS and IMO network we used to create 12 maps The time resolution of TEC about 1 hour. The TEC maps show that the maximum TEC value ever SVOG is at 1000 LT (1300 LT) while in ARHO i NUT (UT-LT) March 2007, when it was summer in the polar region, the TEC valer aver SYOG ramp was Apher by 3 TECU than ARHO, which was experiencing winter dering that time. This has proved the rule af sun in the TEC but with photoionization process. The measurements of the TEC variation obtained from GPS during different months at both hemispheres showed symmetry in the median TEC at the conjugate points.