Data of nine Indian magnetic observatories located at Alibag, Pondicherry, Hyderabad, Sabhawala, Tirunalveli, Nagpur, Silchar, Visakhapatnam and Jaipur.
Data of nine Indian magnetic observatories located at Alibag, Pondicherry, Hyderabad, Sabhawala, Tirunalveli, Nagpur, Silchar, Visakhapatnam and Jaipur.