C. Debi Prasad
Articles written in Journal of Astrophysics and Astronomy
Volume 10 Issue 1 March 1989 pp 1-20
Optical interferometric observations of a transient event of 1986 March 13 in the coma of Comet Halley
C. Debi Prasad T. Chandrasekhar J. N. Desai N. M. Ashok Vinod Krishan
During the recent apparition of Comet Halley in 1985-86 a transient ionic event in the form of a blob of H2 O+ emission was recorded in thecoma at ∼ 0h UT on 1986 March 13. Observations were carried out using a special IHW filter for H2 O+ emission at 7000 å/175 å, a 35 cm telescope, a Fabry-Perot interferometer and an image intensifier camera from Gurushikhar, Mt Abu. (24‡39’N,
Volume 18 Issue 1 June 1997 pp 39-55
Chromospheric evolution and the flare activity of super-active region NOAA 6555
C. Debi Prasad Ashok Ambastha Nandita Srivastava Sushanta C. Tripathy Mona J. Hagyard
Super-active region NOAA 6555 was highly flare productive during the period March 21st–27th, 1991 of its disk passage. We have st udied its chromospheric activity using high spatial resolution Hα filtergrams taken at Udaipur along with MSFC vector magnetograms. A possible relationship of flare productivity and the variation in shear has been explored. Flares were generally seen in those subareas of the active region which possessed closed magnetic field configuration, whereas only minor flares and/or surges occurred in subareas showing open magnetic field configuration. Physical mechanisms responsible for the observed surges are also discussed.
Volume 44, 2023
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