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Tirunelveli Magnetic Observatory


Functional building of Equatorial Geophysical Research Laboratory, Tirunelveli

Magnetc Observatory IAGA Code
Latitude(oN) Longitude(oE) Latitude(oN) Longitude
Tirunelveli TIR 8.70 77.80 0.03 150.40

Magnetic field measurements at this observatory commissioned in the year 1996 in the campus of Institute's regional center, Equatorial Geophysical Research Laboratory, Krishnampuram village, Tirunelveli in Tamilnadu.

The geomagnetic equator passes through the southern peninsular region of India. A temporary magnetic observatory was established in 1957 in the campus of Kerala University, Trivandrum, towards the Indian contribution to the International Geophysical Year 1957-58. The International Geophysical Year (IGY), as it was called, was modeled on the International Polar Years of 1882-1883 and 1932-1933 and was intended to allow scientists from around the world to take part in a series of coordinated observations of various geophysical phenomena. Although representatives of 46 countries originally agreed to participate in the IGY, by the close of the activity, 67 countries had become involved.

Though the Trivandrum magnetic observatory was initially planned for three years, seeing the immense contribution of equatorial magnetic data in understanding the physics of equatorial electroject, it was decided to make it permanent. Trivandrum observatory was closed in the year due to increased electromagnetic noise in the vicinity of the observatory.

Simultaneous magnetic measurements carried out at Trivandrum and Tirunelveli during the period 1996-1998 were analysed to establish a comparative study of themagnetic variations at these two locations. The observed average values of 'H', 'Z' and 'D' at Trivandrum and Tirunelveli for the year 1999 are shown in the table below.

  Trivandrum Tirunelveli Tirunelveli- Trivandrum
Element H(nT) Z(nT) D H(nT) Z(nT) D ∆H(nT) ∆Z(nT) ∆D
Average 40007 792 2o32'.2 40005 372 2o49'.2 48 -420 25'.8

Thus, about 53 years of magnetic data in the Indian equatorial region can be effectively used by combing magnetic measurements at Trivandrum and Tirunelveli.

Variation Recordings : IZMIRAN II, Digital fluxgate magnetometer.
Absolute Measurements : Proton Precession Magnetometer, Declination- Inclination Magnetometer.
Staff at Observatory : Mr. S. Sathish Kumar, Mr. P. Elango,  Mr. S. Sankaran
Address : Equatorial Geophysical Research Laboratory Vittalapuram Vilakku, Krishnapuram, Maharajanagar, Tirunelveli 627011, India
Contact Persons : satyavir@iigs.iigm.res.in & gopiseemala@iigs.iigm.res.in

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