Fig. 1.
From: Secular trend of geomagnetic elements in the Indian region
(a) The location of the six Indian Magnetic observatories—Trivandrum (TRD)/Tirunelveli (TIR), Kodaikanal (KOD), Annamalainagar (ANN)/Pondicherry (PON), Hyderabad (HYB), Alibag (ABG) and Sabhawala (SAB). (b) shows the position of the Dip Equator for the years 1975, 1985, 1995 and 2005 and its migration towards the south. Note Pondicherry (PND) is shown as PON.