Kodaikanal Observatory Publications: Recent submissions

Now showing items 1-20 of 290

Effect of the solar eclipse on some atmospheric parameter

Rai, J; Rai, A; Kumar, A; Singh, A. K; Singh, M. P; Nigam, M. J (Indian Institute of Astrophysics, Bangalore, 1997)

To study the solar terrestrial atmospheric parameters such as positive conductivity, negative conductivity, aerosols measurement for forward and backward scattering and atmospheric temperature were recorded at Roorkee ...
Record of extended corona using colour video

Saxena, A. K; Samson, J. P. A; Lancelot, J. P (Indian Institute of Astrophysics, Bangalore, 1997)

The entire event of the total solar eclipse of October 24 1995 was vediographed at our Kalpi camp. We have used SONY handy cam Video 8 Model No. CCD FX 280E PAL attached with 12x variable zoom lens. Partial eclipse was ...
Response of the small-scale dynamics of lower F-region plasma over Kodaikanal to the total solar eclipse of October 24, 1995

Visweswara Rao, J. V. S; Sastri, J. H (Indian Institute of Astrophysics, Bangalore, 1997)

Continuous and high-time resolution recording of the changes in phase path (Doppler frequency shift) of lower F-region reflections over Kodaikanal were made in the forenoon on October 24, 1995 and on several days prior to ...
F-region oscillations observed during October 24, 1995 solar eclipse at Waltair

Rao, B. M; Anhjaneyulu, P (Indian Institute of Astrophysics, Bangalore, 1997)

Measurements of changes in phase path/Doppler of HF signals on 5.5 MHz from F-region of the ionosphere are carried-out using coherent pulsed Doppler radar. Preliminary analysis of the data show large deviations in phase ...
Observations of surface atmospheric electric potential gradient and boundary layer parameter during the total solar eclipse of October 24, 1995

Manohar, G. K; Kandalgaonkar, S. S; Vernekar, K. G; Trimbake, H. K (Indian Institute of Astrophysics, Bangalore, 1997)

A study of the impact of a total solar eclipse (TSE) on surface atmospheric electricity was made using observations of surface electrical potential gradient and boundary layer parameters during the TSE of 24 October 1995 ...
NCSTC programme on total solar eclipse 1995

Kamble, V. B (Indian Institute of Astrophysics, Bangalore, 1997)

NCSTC and Vigyan Prasar jointly undertook a country wide programme on S & T popularization built around the total solar eclipse (TSE) of October 24, 1995. The main objective of the program was to polarize astronomy in ...
Details of the expedition to Iradatganj during total solar eclipse of October 24, 1995

Bandyopadhyay, A; Pandey, P; Narayan, A; Biswas, C; Neogy, S (Indian Institute of Astrophysics, Bangalore, 1997)

Equipment: Celestron C-14 Schmidt Cassegrain Telescope (14" diameter), off-axis 6" solar filter, ST6 CCD camera, Off-axis polaroid filter 6" rotatable in steps of 60 degree.
Colour photography of solar corona during the total solar eclipse of October 24, 1995

Gopalakrishna Reddy, M; Rama Rao, P. V. S; Krishna Rao, D. V (Indian Institute of Astrophysics, Bangalore, 1997)

Very good color pictures of the solar corona of 24th October 1995 were taken by a team from Andra University, from Budge Budge, Calcutta. A total of 36 pictures recorded the various phases of the eclipse from the first to ...
Variation of light intensity during the total solar eclipse

Dutta, A (Indian Institute of Astrophysics, Bangalore, 1997)

The variation of light intensity was recorded at Birla Industrial & technology Museum, Calcutta using a moving coli galvanometer and LDR on the eclipse day and one day prior to the eclipse. It was found that there was a ...
Photometric observations of solar corona during total solar eclipse of October 24, 1995

Kumar, S. S; Sharma, P; Devgun, C. B (Indian Institute of Astrophysics, Bangalore, 1997)

Twenty pictures of solar corona were taken on October 24, 1995 from Bhind on the central line of totality, covering a wide range of exposure times a 500mm telephoto lens captured Images on 35mm film duly calibrated. This ...
Observations on the Unusual States in the Normal Patterns of the Private Behavior During the Total Solar Eclipse

Parthasarathy, M. D; Kulkarni, A. G (Indian Institute of Astrophysics, Bangalore, 1997)

Systematically planned observations conclusively reveal that sudden and large natural changes in the ambient light conditions during a total solar eclipse for a few minutes, initiates and cause marked alterations in the ...
γ and X ray measurements during total solar eclipse on October 24, 1995 at Diamond Harbour

Chintalapudi, S. N; Ghosh, V; Krishna, J. B. M; Verman, J. R; Prakash, H; Pal, G; Mishra, N. R; Bera, M; Reddy, V. R; Ranganath, M. R; Majumdar, C. K (Indian Institute of Astrophysics, Bangalore, 1997)

The γ-ray and X-ray background was measured at Diamond Harbor located on the total eclipse phase path, during total solar eclipse (TSE) which occurred on October 24, 1995. The data taken by two high resolution γ-ray ...
Video recording of the flash spectrum during the total solar eclipse October 24, 1995

Trivedi, P; Guruprasad, R; Radhakrishnan, R. S (Indian Institute of Astrophysics, Bangalore, 1997)

Flash spectra were recorded at video rate from Behind, Madhya Pradesh A holographic transmission grating, was used in front of a CCD video camera. Using a. solar Image of 0 5mm diameter, the spectrum on the CCD was recorded ...
Transient Solution of Equations of Hydrodynamics in Gas Clouds

Peraiah, A (Indian Institute of Astrophysics, 1981)

We have presented numerical results of transient phenomenon in incompressible fluids. This has been obtained by solving the equations of conservation of momentum, energy and mass in X and Y geometry. We have used the explict ...
Differential rotation of solar features and its variation as deduced from the "shock-transition model" of the solar cycle

Gokhale, M. H (Indian Institute of Astrophysics, 1979-11)

From the topology of the two families of flux tubes in the shock-transition model of the solar cycle we predict the general nature of the differential rotation of: (i) sunspots and the small scale emission features in ...
The astronomical seeing at Kavalur.

Bappu, M. K. V; Mohin, S; Unnikrishnan, K. G (Indian Institute of Astrophysics, 1978)

A summary of observing conditions at Kavalur Observatory is p0resented. These related to spectroscopic and photometric observations and to seeing as evaluated at the 102cm telescope. Nearly fifty percent of nights on which ...
Violet absorption edges of C IV lines in Wolf-Rayet spectra: possible superposition with diffuse interstellar bands at 5780 Å and 5797 Å

Giridhar, S; Bappu, M. K. V (Indian Institute of Astrophysics, 1978)

It is shown that the violet edges normally seen in Wolf-Rayet stars around 5800Å are principally due to displaced C IV absorption. The diffuse interstellar bands are seldom of comparable strength and can be seen separately ...
The two components of the solar activity cycle as a consequence of the shock transition model of the solar magnetic cycle

Gokhale, M. H (Indian Institute of Astrophysics, 1979-11)

Justification is given for comparing the consequences of the shock transition model of the solar magnetic cycle with important observed properties of the solar activity cycle without waiting for the basic postulates of the ...
Effects of partial frequency redistribution with dipole scattering on the formation of spectral lines in expanding media

Peraiah, A (Indian Institute of Astrophysics, 1978)

Line formation in expanding spherical atmospheres using partial frequency redistribution with dipole scattering has been studied by using a non LTE two level atom model. Lines with zero natural line widths are treated by ...
Why is geomagnetic activity during the ending years of a solar cycle well correlated to the maximum of the next cycle?

Gokhale, M. H (Indian Institute of Astrophysics, 1979-11)

The two component nature of the solar activity cycle as resulting from the shock-transition model of the solar magnetic cycle, provides for a correlation between a measure of coronal hole formations during the ending years ...

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