The large convective cells have an average size of about 30000 Km and average life of about 20 hours. These can also be seen as network cells in the Ca-K line images of the sun. Therefore, to study the formation and decay of these cells without the occurrences of day-night cycle, we planned imaging of sun in Ca-K line with an interval of about 5 minutes. We, were lucky, to get the images for 106 hours. Generally, the weather condition in Antarctic region remain very hostile and sky remains clear for a day or two. In my talk I discuss the various aspects of the expedition and the results obtained from the analysis of data. We find that the convective cells in the active region have larger life time as compared to similar size cells in the quiet region of the sun. It implies that the presence of magnetic field slows down the diffusion rate. It may be noted that the opportunity exited starting from the first Indian expedition to Antarctic region but it materialized only in the ninth Indian expedition to Antarctica.
Prof. Jagdev Singh has long association with ARIES earlier UPSO, since 1988 when the planning and execution for the first astronomical expedition to Antractica was started. Lead the first astronomical expedition, 3 member team consisting to Indian station in Antarctica in 1989.
1.He did his Ph. D. With Dr. M K V Vainu Bappu a well known astronomer in the year 1984 using the data obtained by him during the total solar eclipses in 1980 & 1983.
2.Planned and successfully executed 10 expeditions to make observations of the solar corona during the total solar eclipses of the Sun.
3. He planned, designed and proposed VELC mission on ADITYA-1 (first Indian mission (Solar Coronagraph) to observe the sun) expected to be launched in 2019 (Principal Investigator from 2006 to 2015).