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  • The nature of comets 
    Bappu, M. K. V (Astronomical Society of the Pacific, 1952)
  • Nature of crochet associated solar microwave bursts 
    Sastri, J. H (National Institute of Science Communication and Information Resources, CSIR, 1977-09)
    Using crochet data at Kodaikanal and solar-microwave-burst data at Toyokawa, Japan, a study is made of the nature of crochet-associated solar microwave bursts. Consideration of the results in the light of earlier work ...
  • Nature of dust grains in comets 
    Krishna Swamy, K. S; Shah, G. A (Royal Astronomical Society, 1988-08)
    The observed reddening in the wavelength range 0.26-2.25 microns for comae of several comets can be represented quite well with model grains having real and imaginary parts of refractive index, m = m-prime - im-double ...
  • Nature of geomagnetic-field variation on AQDS at equatorial latitudes 
    Sastri, J. H (National Institute of Science Communication and Information Resources, 1981-02)
    From a comparative study of the diurnal variation of equatorial geomagnetic field during abnormal quiet days (AQDs) and normal quiet days (NQDs). It is shown that an additional field exists in the equatorial region during ...
  • Nature of helicity injection in non-erupting solar active regions 
    Vemareddy, P (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)
    Using time-sequence vector magnetic field and coronal observations from Solar Dynamics Observatory, we report the observations of the magnetic field evolution and coronal activity in four emerging active regions (ARs). ...
  • The Nature of jets in double-peaked emission-line AGN in the KISSR sample 
    Kharb, P; Subramanian, S; Mousumi Das; Vaddi, S; Paragi, Z (IOP Publishing, 2021-10-01)
    Double-peaked emission-line AGN (DPAGN) have been regarded as binary black hole candidates. We present here results from parsec-scale radio observations with the Very Long Baseline Array (VLBA) of five DPAGN belonging to ...
  • The nature of non-Gaussianity and statistical isotropy of the 408 MHz Haslam synchrotron map 
    Fazlu Rahman; Pravabati, C; Ghosh, Tuhin (IOP Publishing, 2021-07)
    Accurate component separation of full-sky maps in the radio and microwave frequencies, such as the cosmic microwave background (CMB), relies on a thorough understanding of the statistical properties of the Galactic foreground ...
  • Nature of quiet Sun oscillations using data from the hinode, TRACE, and SOHO spacecraft 
    Gupta, G. R; Subramanian, S; Banerjee, D; Madjarska, M. S; Doyle, J. G (Springer, 2013-01)
    We study the nature of quiet-Sun oscillations using multi - wavelength observations from TRACE, Hinode, and SOHO. The aim is to investigate the existence of propagating waves in the solar chromosphere and the transition ...
  • The nature of the compact object in quiescent SXTs 
    Sutaria, F. K; Kolb, U. C; Kuulkers, E; Charles, P; Chaty, S (American Institute of Physics, 2008-10)
    We report on the observation of two quiescent stage Soft X-ray transients-the BH-SXT GS1124-68 and the NS-SXT J2123-058.
  • The nature of the crust in southern India: Implications for Precambrian crustal evolution 
    Gupta, S; Rai, S. S; Prakasam, K. S; Srinagesh, D; Bansal, B. K; Chandha, R. K; Priestley, K; Gaur, V. K (American Geophysical Union, 2003-04-16)
    We present crustal thickness and Poisson's ratio determinations from receiver function analyzes at 32 sites on the Archaean and Proterozoic terrains of South India. The crustal thickness in the late Archaean (2.5 Ga) Eastern ...
  • The nature of the progenitors of supernovae of type I 
    van der Bergh, Sidney (Astronomical Society of India, 1982-09)
    This paper examines the hypothesis that supernovae of type I are produced by relatively 'young' single stars. The fact that SN I are not concentrated in spiral arms implies that their progenitors have M approximately less ...
  • The nature of the Stingray nebula from radio observations 
    Harvey-Smith, L; Hardwick, J. A; De Marco, O; Parthasarathy, M; Gonidakis, I; Shaila Akhter; Cunningham, M; Green, J. A (Oxford University Press on behalf of the Royal Astronomical Society, 2018-09)
    We have analysed the full suite of Australia Telescope Compact Array data for the Stingray planetary nebula. Data were taken in the 4–23 GHz range of radio frequencies between 1991 and 2016. The radio flux density of the ...
  • Nature of Tilt Angles of Sunspot Groups During the 22nd Solar Cycle 
    Muneer, S; Singh, J (Springer, 2002-10)
    Daily white-light images from Kodaikanal Observatory have been utilized to study the nature of tilt angles of sunspot groups during the 22nd solar cycle. 2416 spot groups have been measured to find the tilt angle. An average ...
  • The Nature of γ -ray loud Narrow-line Seyfert I Galaxies PKS 1502+036 And PKS 2004-447 
    Paliya, Vaidehi S; Stalin, C. S; Shukla, A; Sahayanathan, S (IOP Publishing, 2013-05-01)
    Variable γ-ray emission has been discovered in five radio-loud narrow-line Seyfert 1 (NLSy1) galaxies by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. This has clearly demonstrated that these NLSy1 ...
  • 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 ...
  • Near absence of hard X-ray pulsation from GS 1843+00 in the middle of burst phase 
    Manchanda, R. K (Astronomical Society of India, 2000)
    Hard X-ray transient pulsar GS 1843+00 was observed in the 20-200keV region using a high sensitivity large area scintillation counter instrument during its 1997 flare on March 30. The data indicates a near absence of 29.5s ...
  • Near infrared astronomy with moderate size telescopes 
    Rengarajan, T. N (Astronomical Society of India, 1998)
  • Near infrared coronal line emission in nova Herculis 1991 
    Chandrasekhar, T; Ashok, N. M; Ragland, S (Astronomical Society of India, 1993)
    Near infrared coronal line emission at 1.98 +/- 0.02 micrometers due to (Si VI) detected in the spectrum of Nova Herculis 1991 as early as about 17 days after optical maximum is reported. The coronal line observations ...
  • Near infrared high angular resolution observations of stars and circumstellar regions by the technique of lunar occultations 
    Chandrasekhar, T; Ashok, N. M; Sam Ragland (Astronomical Society of India, 1993)
    A program of high angular resolution observations of stars and their circumstellar regions using the technique of lunar occultations has been initiated at the Physical Research Laboratory, Ahmedabad. A liquid nitrogen ...
  • Near Infrared Observations of Sakurai's Object during 1998-99 
    Kamath, U. S; Ashok, N. M (Springer, 2002-03)
    We present new near-infrared observations of Sakurai's Object obtained during 1998-99 when this final helium shell flash object was in the dust condensation phase. The infrared colours have reddened compared to earlier ...

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