Rohini Satellite Completes Mission

SPACE SCIENCE

The satellite had far outlived its design life of one year, sending valuable scientific data from its two scientific instruments, namely, the Gamma Ray Burst (GRB) Detector and Retarding Potential Analyser (RPA).

Bangalore - July 12, 2001
The Stretched Rohini Satellite Series (SROSS-C2), launched by ISRO on May 4, 1994 on board its Augmented Satellite Launch Vehicle (ASLV-D4) from Sriharikota, re-entered the atmosphere this morning (July 12, 2001) after successfully being in orbit for more than seven years.

The GRB was to detect Gamma Ray Bursts that occur several million light years away, which emit very high-energy electromagnetic radiations. These bursts, which are the result of violent explosions, have been the subject of intense research in the last few decades. Such Gamma-ray emissions last from a few milliseconds to a few seconds.

The primary focus of gamma-ray burst research in the early 90's has been to determine the sky distribution of these emissions and to obtain as many independent gamma ray detections as possible using widely spaced observation platforms in space.

It is in this context that the GRB on board SROSS-C2 assumed significance. SROSS-C2, during its mission, detected around 60 Gamma Ray Burst events in the 20 KeV to 3000 KeV range. The latest burst (GRB1267) detected was on April 27, 2001. The information on such Gamma-ray bursts has been widely disseminated to the world scientific community through the global coordination network.

The other instrument, Retarding Potential Analyser (RPA), has collected data over the Indian subcontinent providing insight into the characteristics and structure of the equatorial low latitude ionosphere. Scientists from eight universities in the country are carrying out detailed analysis of the data.

It is significant to note that the data from RPA covers the solar activity from its minimum in 1996 to its present maximum activity thus providing an entire spectrum of data.

The life of SROSS-C2, which had almost come to an end in June 2000, was extended by another year by raising its orbit using the residual fuel on board.

The last signals from SROSS-C2 were acquired at 7 am (IST) this morning by the ISRO's Telemetry, Tracking and Command Network station at Mauritius when the satellite was in an orbit at a height of 139 km. It is significant that all the satellite subsystems were working very well till the 40,058th orbit, which was the last orbit to be tracked before its re-entry.

The ISTRAC network stations and the supporting station at Weilheim, Germany, were able to track the satellite even when it was in the denser part of the atmosphere with a fast orbital decay in its last moments. Thus, SROSS-C2 well exceeded all the set goals in its seven years mission providing valuable scientific data sets.

TERRADAILY

ISRO and CNES, Sign MOU for Atmospheric Research Mission

Bangalore - May 14, 2001
The Indian Space Research Organisation (ISRO) and the French Space Agency (CNES) signed a Memorandum of Understanding (MOU) last Wednesday for the design of a joint satellite mission, Megha Tropiques, for atmospheric research. The MOU was signed by Dr K Kasturirangan, Chairman, ISRO and Prof Bensoussan, President, CNES at Antariksh Bhavan, Bangalore, the headquarters of ISRO.

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