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Alibag Magnetic Observatory

Observatory name IAGA Code
Latitude(oN) Longitude(oE) Latitude(oN) Longitude
Alibag ABG 18.62 72.87 10.36 146.54

Variometer Room of Alibagh Magnetic Observatory

Alibag is located on the West Coast of India about 30 km SSE of Mumbai, away from the influence of the equatorial electrojet. This observatory was established in 1904 and is the PRIMARY MAGNETIC OBSERVATORY of the Institute.

Alibag Magnetic Observatory was established in 1904 as the substitute for Colaba Observatory. The first regular magnetic observatory in the country at Colaba was established in 1841, but the regular observations started in 1846. The earlier data were based on eye observations of the magnetic instruments, every hour. During magnetic disturbances these observations were taken at every fifteen minute interval instead of one hour. In 1872, these were augmented by equipment that continuously registered the changing geomagnetic field photographically. With the introduction of the electric tramways in the vicinity of the observatory, the magnetic recordings at Colaba had to be discontinued. However, careful preplanning by Dr. Nana Bahi Moosand search led to an ideal alternate site at Alibag where a new observatory was established. Two years of comparative observations between 1904 and 1906 at both sites proved beyond doubt that the Alibag data can be tied up with that of Colaba after applying site corrections.

Alibag observatory became member of INTERMAGNET in 1997 and magnetic data is sent in near real time to Kyoto. Observatory data is used in computation of magnetic disturbance index Dst.

Magnetic compasses (Landing, Datum) of Indian Navy, Indian Coast Guard Air stations and Pawan Hans Helicopter Ltd. are calibrated at the observatory. Magnetic instruments of Survey of India and National Geophysical Research Institute are calibrated at this observatory regularly.

Magnetic variations recorded at this observatory are sent to H.Q. in near real time.

Variation Recordings : IZMIRAN II, Digital fluxgate magnetometer.
Absolute Measurements : Vector Proton Precession Magnetometer, Overhauser Magnetometer, Declination- Inclination Magnetometer.
Staff at Observatory :  Mr. S Patro, Mr. A. Bhingare, Mr. Anoop K.S.
Address : Alibag, Magnetic observatory Alibag, Dist. Raigad, Maharashtra - 402201, India
Contact Persons : satyavir@iigs.iigm.res.in & gopiseemala@iigs.iigm.res.in,

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